Securing Generative AI: Defending the Future of Innovation and Creativity
Protect your organization's generative AI investments by mitigating security risks effectively. This comprehensive guide examines the assets of AI systems, analyzes potential threats, and offers actionable recommendations to strengthen security and maintain the integrity of your AI-powered applications.F5 Distributed Cloud WAF AI/ML Model to Suppress False Positives
Introduction: Web Application Firewall (WAF) has evolved to protect web applications from attack. A signature-based WAF responds to threats through the implementation of application-specific detection rules which block malicious traffic. These managed rules work extremely well for patterns of established attack vectors, as they have been extensively tested to minimize both false negatives and false positives. Most of the Web Applications development is concentrated to deliver services seamlessly rather than integrating security services to tackle recent or every security attack. Some applications might have a logic or an operation that looks suspicious and might trigger a WAF rule. But that is how applications are built and made to behave depending on their purpose. Under these circumstances WAF considers requests to these areas as attack, which is truly not, and the respective attack signature is invoked which is called as False Positive. Though the requests are legitimate WAF blocks these requests. It is tedious to update the signature rule set which requires greater human effort. AI/ML helps to solve this problem so that the real user requests are not blocked by WAF. This article aims to provide configuration of WAF along with Automatic attack signature tuning to suppress false positives using AI/ML model. A More Intelligent Solution: F5 Distributed Cloud (F5 XC) AI/ML model uses self-learning probabilistic machine learning model that suppresses false positives triggered by Signature Engine. AI/ML is a tool that identifies the false positives triggered by signature engine and acts as an additional layer of intelligence, which automatically suppresses false positives based on a Machine learning model without human intervention. This model minimizes false positives and helps to determine the probability that triggered the particular signature is evidence of an attack or just an error or a change in how users interact with the application. This model is trained using vast amount of benign and an attack traffic of real time customer log. AI/ML model does not rely on human involvement to understand operational patterns and user interactions with Web Application. Hence it saves a lot of human effort. Step by step procedure to enable attack signature tuning to supress false positives These are the steps to enable attack signatures and its accuracy Create a firewall by enabling Automatic attack signatures Assign the firewall to Load Balancer Step 1: Create an App Firewall Navigate to F5 XC Console Home > Load Balancers > Security > App Firewall and click on Add App Firewall Enter valid name for Firewall and Navigate to Detection Settings Select Security Policy as “Custom” with in the Detection settings and select Automatic Attack Signatures Tuning “Enable” as shown below, Select Signature Selection by Accuracy as “High and Medium” from the dropdown. Scroll down to the bottom and click on “Save and Exit” button. Steps 2: Assigning the Firewall to the Load Balancer From the F5 XC Console homepage, Navigate to Load Balancers > Manage > Load Balancers > HTTP load balancer Select the load balancer to which above created Firewall to be assigned. Click on menu in Actions column of app Load Balancer and click on Manage Configurations as shown below to display load balancer configs. Once Load Balancer configurations are displayed click on Edit configuration button on the top right of the page. Navigate to Security Configuration settings and choose Enable in dropdown of Web Application Firewall (WAF) Assign the Firewall to the Load Balancer which is created in step 1 by selecting the name from the Enable dropdown as shown below, Scroll down to the bottom and click on “Save and Exit” button, with this Firewall is assigned to Load Balancer. Step 3: Verify the auto supressed signatures for false positives From the F5 XC Console homepage, Navigate to Web App and API Protection > Apps & APIs > Security and select the Load Balancer Select Security Events and click on Add filter Enter the key word Signatures.states and select Auto Supressed. Displayed logs shows the Signatures that are auto supressed by AI/ML Model. "Nature is a mutable cloud, which is always and never the same." - Ralph Waldo Emerson We might not wax that philosophically around here, but our heads are in the cloud nonetheless! Join the F5 Distributed Cloud user group today and learn more with your peers and other F5 experts. Conclusion: With the additional layer of intelligence to the signature engine F5 XC's AI/ML model can automatically suppresses false positives without human intervention. Customer can be less concerned about their activities of application that look suspicious which in turns to be actual behaviour and hence the legitimate requests are not blocked by this model. Decisions are based on enormous amount of real data fed to the system to understand application and user’s behaviour which makes this model more intelligent.Secure, Deliver and Optimize Your Modern Generative AI Apps with F5
In this demo, Foo-Bang Chan explores how F5's solutions can help you implement, secure, and optimize your chatbots and other AI applications. This will ensure they perform at their best while protecting sensitive data. One of the AI frameworks showed is Enterprise Retrieval-Augmented Generation (RAG). This demo leverages F5 Distributed Cloud (XC) AppStack, Distributed Cloud WAAP, NGINX Plus as API Gateway, API-Discovery, API-Protection, LangChain, Vector databases, and Flowise AI.Using ChatGPT for security and introduction of AI security
TL;DR There are many security services that uses ChatGPT. Methods to attack against AI are, for example, input noises, poisoning data, or reverse engineering. Introduction If you hear about "AI and security", 2 things can be considered. First, using AI for cyber security. Second, attack against AI. In this article, I am going to discuss these topics. - Using AI for security: Introducing some security application that uses ChatGPT. - Attack against AI: What it is. Using AI (ChatGPT) for security (purpose) Since the announcement of GPT-3 in September 2020 and the release of many image-generating AIs in 2022, using AI become commonplace. Especially, after the release of ChatGPT in November 2022, it immediately got popular because of its ability to generate quite natural sentences for human. ChatGPT is also used to code from human's natural languages, and also can be used to explain the meaning of the codes, memory dumps, or logs in a way that is easy for human to understand. Finding an unusual pattern from a large amount of data is what AI is good at. Hence, there is a service to use AI for Incident Response. - Microsoft Security Copilot : Security Incident response adviser. This research uses ChatGPT to detect phishing sites and marked 98.3% of accuracy. - Detecting Phishing Sites Using ChatGPT Of course, the ChatGPT can be used for penetration testing. - PentestGPT However no one is willing to share sensitive information with Microsoft or other vendors. Then it is possible to run ChatGPT-Like LLM on Your PC Offline by some opensource LLM application, for example gpt4all. gpt4all needs GPU and large memory (128G+) to work. - gpt4all ChatGPT will be kept used for both offensive and defensive security. Attack against AI Before we discuss about attack against AI, let's briefly review how AI works. Research on AI has long history. However, generally people uses AI as a Machine Learning model or Deep Learning algorithms, and some of them uses Neural Network. In this article, we discuss about Deep Neural Network (DNN). DNN DNNs works as follows. At first, there are several nodes and one set of those are called nodes. Each nodes has it layer and the layer are connected each other. (Please see the pic below). The data from Input layer is going to propagate to multiple (hidden) layers and then finally reached to the Output layer, which performs classification or regression analysis. For example, input many pictures of animals to let the DNN learn, and then perform to identify (categorize) which animal is in the pictures. What kind of attacks are possible against AI? Threat of cyber security is to compromise the system's CIA (Confidentiality, Integrity, Availability). The attack to AI is to force wrong decisions (lose Integrity), make the AI unavailable (lose availability), or the decision model is theft (lose confidentiality). Among these attacking, the most well-known attack methodology is to input a noise in the input layer and force wrong decision - it is named as an Adversarial Example attack. Adversarial Example attack The Adversarial Example is illustrated in this paper in 2014: - Explaining and Harnessing Adversarial Examples The panda in the picture on the left side is the original data and be input to DNN - normally, the DNN will categorize this picture as panda obviously. However, if the attacker add a noise (middle picture), the DNN misjudge it as a gibbon. In other words, the attack on the AI is to make the AI make a wrong decision, without noticed by humans. The example above is attack to the image classifier. Another attack example is ShapeShifter, which attack to object detector. This makes a self-driving car with AI cause an accident without being noticed by humans, by makes stop signs undetectable. - ShapeShifter: Robust Physical Adversarial Attack on Faster R-CNN Object Detector Usually, a stop sign image is captured through a optical sensor in a self-driving car, and its object detector would recognise it as a stop sign and follow the instructions on the sign to stop. However, this attack would cause the car to fail to recognise the stop sign. You might think even if the DNN model on a self driving car is classified so the attacker can't get info to attack to the specific DNN model. However, the paper below discuss that an adversarial example designed for one model can transfer to other models as well (transferability). - Transferability Ranking of Adversarial Examples That means, even if an attacker is unable to examine the target DNN model, they can still experiment and attack by other DNN models. Data poisoning attack In an adversarial example attack, the data itself is not changed, instead, added noise to the data. The attack that poisoning the training data also exists. Data poisoning is to access to the training data which is used to learn/train the DNN model, and input incorrect data to make DNN model produce results which is profitable for the attacker, or reducing the accuracy of the learning. Inputting a backdoor is also possible. - Transferable Clean-Label Poisoning Attacks on Deep Neural Nets Reverse engineering attack Vulnerabilities in cryptography include a vulnerability that the attacker can learn the encryption model by analyzing the input/output strings which are easy to obtain. Similarly, in AI models, there is a possibility of reverse engineering of DNN models or copy the models by analysing the input (training data) and output (decision results). These papers discuss about that. - Reverse-Engineering Deep Neural Networks Using Floating-Point Timing Side-Channels - Copycat CNN Finally, there's one last thing I'd like to say. This article was not generated by ChatGPT.F5 AI Gateway - Secure, Deliver and Optimize GenAI Apps
AI has revolutionized industries by automating tasks, enabling data-driven decisions, and enhancing efficiency and innovation. While it offers businesses a competitive edge by streamlining operations and improving customer experiences, it also introduces risks such as security vulnerabilities, data breaches, and cost challenges. Businesses must adopt robust cybersecurity measures and carefully manage AI investments to balance benefits with risks. F5 provides comprehensive controls to protect AI and IT infrastructures, ensuring sustainable growth in an AI-driven world. Welcome to F5 AI Gateway - a runtime security and traffic governance solutionHow to Prepare Your Network Infrastructure to Add HPC Clusters for AI to Your Data Center
HPC AI clusters are getting deployed as highly-engineered 'lego blocks' which are opaque to established data center operations and standards. By taking advantage of established Kubernetes based networking solutions that provide high-speed intelligent networking, you can save yourself from expensive cost overruns, data center re-auditing, and delays. By using Kubernetes based solutions which take advantage of the high-speed networking solutions already required by HP AI deployments, you further optimize your investment in AI.SSL Orchestrator Advanced Use Cases: Detecting Generative AI
Introduction Quick, take a look at the following list and answer this question: "What do these movies have in common?" 2001: A Space Odyssey Westworld Tron WarGames Electric Dreams The Terminator The Matrix Eagle Eye Ex Machina Avengers: Age of Ultron M3GAN If you answered, "They're all about artificial intelligence", yes, but... If you answered, "They're all about artificial intelligence that went terribly, sometimes horribly wrong", you'd be absolutely correct. The simple fact is...artificial intelligence (AI) can be scary. Proponents for, and opponents against will disagree on many aspects, but they can all at least acknowledge there's a handful of ways to do AI correctly...and a million ways to do it badly. Not to be an alarmist, but while SkyNet was fictional, semi-autonomous guns on robot dogs is not... But then why am I talking about this on a technical forum you may ask? Well, when most of the above films were made, AI was largely still science fiction. That's clearly not the case anymore, and tools like ChatGPT are just the tip of the coming AI frontier. To be fair, I don't make the claim that all AI is bad, and many have indeed lauded ChatGPT and other generative AI tools as the next great evolution in technology. But it's also fair to say that generative AI tools, like ChatGPT, have a very real potential to cause harm. At the very least, these tools can be convincing, even when they're wrong. And worse, they could lead to sensitive information disclosures. One only has to do a cursory search to find a few examples of questionable behavior: Lawyers File Motion Written by AI, Face Sanctions and Possible Disbarment Higher Ed Beware: 10 Dangers of ChatGPT Schools Need to Know ChatGPT and AI in the Workplace: Should Employers Be Concerned? OpenAI's New Chatbot Will Tell You How to Shoplift and Make Explosives Giant Bank JP Morgan Bans ChatGPT Use Among Employees Samsung Bans ChatGPT Among Employees After Sensitive Code Leak But again...what does this have to do with a technical forum? And more important, what does this have to do with you? Simply stated, if you are in an organization where generative AI tools could be abused, understanding, and optionally controlling how and when these tools are accessed, could help to prevent the next big exploit or disclosure. If you search beyond the above links, you'll find an abundance of information on both the benefits, and security concerns of AI technologies. And ultimately you'll still be left to decide if these AI tools are safe for your organization. It may simply be worthwhile to understand WHAT tools are being used. And in some cases, it may be important to disable access to these. Given the general depth and diversity of AI functions within arms-reach today, and growing, it'd be irresponsible to claim "complete awareness". The bulk of these functions are delivered over standard HTTPS, so the best course of action will be to categorize on known assets, and adjust as new ones come along. As of the publishing of this article, the industry has yet to define a standard set of categories for AI, and specifically, generative AI. So in this article, we're going to build one and attach that to F5 BIG-IP SSL Orchestrator to enable proactive detection and optional control of Internet-based AI tool access in your organization. Let's get started! BIG-IP SSL Orchestrator Use Case: Detecting Generative AI The real beauty of this solution is that it can be implemented faster than it probably took to read the above introduction. Essentially, you're going to create a custom URL category on F5 BIG-IP, populate that with known generative AI URLs, and employ that custom category in a BIG-IP SSL Orchestrator security policy rule. Within that policy rule, you can elect to dynamically decrypt and send the traffic to the set of inspection products in your security enclave. Step 1: Create the custom URL category and populate with known AI URLs - Access the BIG-IP command shell and run the following command. This will initiate a script that creates and populates the URL category: curl -s https://raw.githubusercontent.com/f5devcentral/sslo-script-tools/main/sslo-generative-ai-categories/sslo-create-ai-category.sh |bash Step 2: Create a BIG-IP SSL Orchestrator policy rule to use this data - The above script creates/re-populates a custom URL category named SSLO_GENERATIVE_AI_CHAT, and in that category is a set of known generative AI URLs. To use, navigate to the BIG-IP SSL Orchestrator UI and edit a Security Policy. Click add to create a new rule, use the "Category Lookup (All)" policy condition, then add the above URL category. Set the Action to "Allow", SSL Proxy Action to "Intercept", and Service Chain to whatever service chain you've already created. With Summary Logging enabled in the BIG-IP SSL Orchestrator topology configuration, you'll also get Syslog reporting for each AI resource match - who made the request, to what, and when. The URL category is employed here to identify known AI tools. In this instance, BIG-IP SSL Orchestrator is used to make that assessment and act on it (i.e. allow, TLS intercept, service chain, log). Should you want even more granular control over conditions and actions of the decrypted AI tool traffic, you can also deploy an F5 Secure Web Gateway Services policy inside the SSL Orchestrator service chain. With SWG, you can expand beyond simple detection and blocking, and build more complex rules to decide who can access, when, and how. It should be said that beyond logging, allowing, or denying access to generative AI tools, SSL Orchestrator is also going to provide decryption and the opportunity to dynamically steer the decrypted AI traffic to any set of security products best suited to protect against any potential malware. Summary As previously alluded, this is not an exhaustive list of AI tool URLs. Not even close. But it contains the most common you'll see in the wild. The above script populates with an initial list of URLs that you are free to update as you become aware of new one. And of course we invite you to recommend additional AI tools to add to this list. References: https://github.com/f5devcentral/sslo-script-tools/tree/main/sslo-generative-ai-categoriesF5 BIG-IP and NetApp StorageGRID - Providing Fast and Scalable S3 API for AI apps
F5 BIG-IP, an industry-leading ADC solution, can provide load balancing services for HTTPS servers, with full security applied in-flight and performance levels to meet any enterprise’s capacity targets. Specific to S3 API, the object storage and retrieval protocol that rides upon HTTPS, an aligned partnering solution exists from NetApp, which allows a large-scale set of S3 API targets to ingest and provide objects. Automatic backend synchronization allows any node to be offered up at a target by a server load balancer like BIG-IP. This allows overall storage node utilization to be optimized across the node set, and scaled performance to reach the highest S3 API bandwidth levels, all while offering high availability to S3 API consumers. S3 compatible storage is becoming popular for AI applications due to its superior performance over traditional protocols such as NFS or CIFS, as well as enabling repatriation of data from the cloud to on-prem. These are scenarios where the amount of data faced is large, this drives the requirement for new levels of scalability and performance; S3 compatible object storages such as NetApp StorageGRID are purpose-built to reach such levels. Sample BIG-IP and StorageGRID Configuration This document is based upon tests and measurements using the following lab configuration. All devices in the lab were virtual machine-based offerings. The S3 service to be projected to the outside world, depicted in the above diagram and delivered to the client via the external network, will use a BIG-IP virtual server (VS) which is tied to an origin pool of three large-capacity StorageGRID nodes. The BIG-IP maintains the integrity of the NetApp nodes by frequent HTTP-based health checks. Should an unhealthy node be detected, it will be dropped from the list of active pool members. When content is written via the S3 protocol to any node in the pool, the other members are synchronized to serve up content should they be selected by BIG-IP for future read requests. The key recommendations and observations in building the lab include: Setup a local certificate authority such that all nodes can be trusted by the BIG-IP. Typically the local CA-signed certificate will incorporate every node’s FQDN and IP address within the listed subject alternate names (SAN) to make the backend solution streamlined with one single certificate. Different F5 profiles, such as FastL4 or FastHTTP, can be selected to reach the right tradeoff between the absolute capacity of stateful traffic load-balanced versus rich layer 7 functions like iRules or authentication. Modern techniques such as multi-part uploads or using HTTP Ranges for downloads can take large objects, and concurrently move smaller pieces across the load balancer, lowering total transaction times, and spreading work over more CPU cores. The S3 protocol, at its core, is a set of REST API calls. To facilitate testing, the widely used S3Browser (www.s3browser.com) was used to quickly and intuitively create S3 buckets on the NetApp offering and send/retrieve objects (files) through the BIG-IP load balancer. Setup the BIG-IP and StorageGrid Systems The StorageGrid solution is an array of storage nodes, provisioned with the help of an administrative host, the “Grid Manager”. For interactive users, no thick client is required as on-board web services allow a streamlined experience all through an Internet browser. The following is an example of Grid Manager, taken from a Chrome browser; one sees the three Storage Nodes setup have been successfully added. The load balancer, in our case, the BIG-IP, is set up with a virtual server to support HTTPS traffic and distributed that traffic, which is S3 object storage traffic, to the three StorageGRID nodes. The following screenshot demonstrates that the BIG-IP is setup in a standard HA (active-passive pair) configuration and the three pool members are healthy (green, health checks are fine) and receiving/sending S3 traffic, as the byte counts are seen in the image to be non-zero. On the internal side of the BIG-IP, TCP port 18082 is being used for S3 traffic. To do testing of the solution, including features such as multi-part uploads and downloads, a popular S3 tool, S3Browser, was downloaded and used. The following shows the entirety of the S3Browser setup. Simply create an account (StorageGRID-Account-01 in our example) and point the REST API endpoint at the BIG-IP Virtual Server that is acting as the secure front door for our pool of NetApp nodes. The S3 Access Key ID and Secret values are generated at turn-up time of the NetApp appliances. All S3 traffic will, of course, be SSL/TLS encrypted. BIG-IP will intercept the SSL traffic (high-speed decrypt) and then re-encrypt when proxying the traffic to a selected origin pool member. Other valid load balancer setups exist; one might include an “off load” approach to SSL, whereby the S3 nodes safely co-located in a data center may prefer to receive non-SSL HTTP S3 traffic. This may see an overall performance improvement in terms of peak bandwidth per storage node, but this comes at the tradeoff of security considerations. Experimenting with S3 Protocol and Load Balancing With all the elements in place to start understanding the behavior of S3 and spreading traffic across NetApp nodes, a quick test involved creating a S3 bucket and placing some objects in that new bucket. Buckets are logical collections of objects, conceptually not that different from folders or directories in file systems. In fact, a S3 bucket could even be mounted as a folder in an operating system such as Linux. In their simplest form, most commonly, buckets can simply serve as high-capacity, performant storage and retrieval targets for similarly themed structured or unstructured data. In the first test, we created a new bucket (“audio-clip-bucket”) and uploaded four sample files to the new bucket using S3Browser. We then zeroed the statistics for each pool member on the BIG-IP, to see if even this small upload would spread S3 traffic across more than a single NetApp device. Immediately after the upload, the counters reflect that two StorageGRID nodes were selected to receive S3 transactions. Richly detailed, per-transaction visibility can be obtained by leveraging the F5 SSL Orchestrator (SSLO) feature on the BIG-IP, whereby copies of the bi-directional S3 traffic decrypted within the load balancer can be sent to packet loggers, analytics tools, or even protocol analyzers like Wireshark. The BIG-IP also has an onboard analytics tool, Application Visibility and Reporting (AVR) which can provide some details on the nuances of the S3 traffic being proxied. AVR demonstrates the following characteristics of the above traffic, a simple bucket creation and upload of 4 objects. With AVR, one can see the URL values used by S3, which include the bucket name itself as well as transactions incorporating the object names as URLs. Also, the HTTP methods used included both GETS and PUTS. The use of HTTP PUT is expected when creating a new bucket. S3 is not governed by a typical standards body document, such as an IETF Request for Comment (RFC), but rather has evolved out of AWS and their use of S3 since 2006. For details around S3 API characteristics and nomenclature, this site can be referenced. For example, the expected syntax for creating a bucket is provided, including the fact that it should be an HTTP PUT to the root (/) URL target, with the bucket configuration parameters including name provided within the HTTP transaction body. Achieving High Performance S3 with BIG-IP and StorageGRID A common concern with protocols, such as HTTP, is head-of-line blocking, where one large, lengthy transaction blocks subsequent desired, queued transactions. This is one of the reasons for parallelism in HTTP, where loading 30 or more objects to paint a web page will often utilize two, four, or even more concurrent TCP sessions. Another performance issue when dealing with very large transactions is, without parallelism, even those most performant networks will see an established TCP session reach a maximum congestion window (CWND) where no more segments may be in flight until new TCP ACKs arrive back. Advanced TCP options like TCP exponential windowing or TCP SACK can help, but regardless of this, the achievable bandwidth of any one TCP session is bounded and may also frequently task only one core in multi-core CPUs. With the BIG-IP serving as the intermediary, large S3 transactions may default to “multi-part” uploads and downloads. The larger objects become a series of smaller objects that conveniently can be load-balanced by BIG-IP across the entire cluster of NetApp nodes. As displayed in the following diagram, we are asking for multi-part uploads to kick in for objects larger than 5 megabytes. After uploading a 20-megabyte file (technically, 20,000,000 bytes) the BIG-IP shows the traffic distributed across multiple NetApp nodes to the tune of 160.9 million bits. The incoming bits, incoming from the perspective of the origin pool members, confirm the delivery of the object with a small amount of protocol overhead (bits divided by eight to reach bytes). The value of load balancing manageable chunks of very large objects will pay dividends over time with faster overall transaction completion times due to the spreading of traffic across NetApp nodes, more TCP sessions reaching high congestion window values, and no single-core bottle necks in multicore equipment. Tuning BIG-IP for High Performance S3 Service Delivery The F5 BIG-IP offers a set of different profiles it can run its Local Traffic Manager (LTM) module in accordance with; LTM is the heart of the server load balancing function. The most performant profile in terms of attainable traffic load is the “FastL4” profile. This, and other profiles such as “OneConnect” or “FastHTTP”, can be tied to a virtual server, and details around each profile can be found here within the BIG-IP GUI: The FastL4 profile can increase virtual server performance and throughput for supported platforms by using the embedded Packet Velocity Acceleration (ePVA) chip to accelerate traffic. The ePVA chip is a hardware acceleration field programmable gate array (FPGA) that delivers high-performance L4 throughput by offloading traffic processing to the hardware acceleration chip. The BIG-IP makes flow acceleration decisions in software and then offloads eligible flows to the ePVA chip for that acceleration. For platforms that do not contain the ePVA chip, the system performs acceleration actions in software. Software-only solutions can increase performance in direct relationship to the hardware offered by the underlying host. As examples of BIG-IP virtual edition (VE) software running on mid-grade hardware platforms, results with Dell can be found here and similar experiences with HPE Proliant platforms are here. One thing to note about FastL4 as the profile to underpin a performance mode BIG-IP virtual server is that it is layer 4 oriented. For certain features that involve layer 7 HTTP related fields, such as using iRules to swap HTTP headers or perform HTTP authentication, a different profile might be more suitable. A bonus of FastL4 are some interesting specific performance features catering to it. In the BIG-IP version 17 release train, there is a feature to quickly tear down, with no delay, TCP sessions no longer required. Most TCP stacks implement TCP “2MSL” rules, where upon receiving and sending TCP FIN messages, the socket enters a lengthy TCP “TIME_WAIT” state, often minutes long. This stems back to historically bad packet loss environments of the very early Internet. A concern was high latency and packet loss might see incoming packets arrive at a target very late, and the TCP state machine would be confused if no record of the socket still existed. As such, the lengthy TIME_WAIT period was adopted even though this is consuming on-board resources to maintain the state. With FastL4, the “fast” close with TCP reset option now exists, such that any incoming TCP FIN message observed by BIG-IP will result in TCP RESETS being sent to both endpoints, normally bypassing TIME_WAIT penalties. OneConnect and FastHTTP Profiles As mentioned, other traffic profiles on BIG-IP are directed towards Layer 7 and HTTP features. One interesting profile is F5’s “OneConnect”. The OneConnect feature set works with HTTP Keep-Alives, which allows the BIG-IP system to minimize the number of server-side TCP connections by making existing connections available for reuse by other clients. This reduces, among other things, excessive TCP 3-way handshakes (Syn, Syn-Ack, Ack) and mitigates the small TCP congestion windows that new TCP sessions start with and only increases with successful traffic delivery. Persistent server-side TCP connections ameliorate this. When a new connection is initiated to the virtual server, if an existing server-side flow to the pool member is idle, the BIG-IP system applies the OneConnect source mask to the IP address in the request to determine whether it is eligible to reuse the existing idle connection. If it is eligible, the BIG-IP system marks the connection as non-idle and sends a client request over it. If the request is not eligible for reuse, or an idle server-side flow is not found, the BIG-IP system creates a new server-side TCP connection and sends client requests over it. The last profile considered is the “Fast HTTP” profile. The Fast HTTP profile is designed to speed up certain types of HTTP connections and again strives to reduce the number of connections opened to the back-end HTTP servers. This is accomplished by combining features from the TCP, HTTP, and OneConnect profiles into a single profile that is optimized for network performance. A resulting high performance HTTP virtual server processes connections on a packet-by-packet basis and buffers only enough data to parse packet headers. The performance HTTP virtual server TCP behavior operates as follows: the BIG-IP system establishes server-side flows by opening TCP connections to pool members. When a client makes a connection to the performance HTTP virtual server, if an existing server-side flow to the pool member is idle, the BIG-IP LTM system marks the connection as non-idle and sends a client request over the connection. Summary The NetApp StorageGRID multi-node S3 compatible object storage solution fits well with a high-performance server load balancer, thus making the F5 BIG-IP a good fit. S3 protocol can itself be adjusted to improve transaction response times, such as through the use of multi-part uploads and downloads, amplifying the default load balancing to now spread even more traffic chunks over many NetApp nodes. BIG-IP has numerous approaches to configuring virtual servers, from highest performance L4-focused profiles to similar offerings that retain L7 HTTP awareness. Lab testing was accomplished using the S3Browser utility and results of traffic flows were confirmed with both the standard BIG-IP GUI and the additional AVR analytics module, which provides additional protocol insight.Securing the LLM User Experience with an AI Firewall
As artificial intelligence (AI) seeps into the core day-to-day operations of enterprises, a need exists to exert control over the intersection point of AI-infused applications and the actual large language models (LLMs) that answer the generated prompts. This control point should serve to impose security rules to automatically prevent issues such as personally identifiable information (PII) inadvertently exposed to LLMs. The solution must also counteract motivated, intentional misuse such as jailbreak attempts, where the LLM can be manipulated to provide often ridiculous answers with the ensuing screenshotting attempting to discredit the service. Beyond the security aspect and the overwhelming concern of regulated industries, other drivers include basic fiscal prudence 101, ensuring the token consumption of each offered LLM model is not out of hand. This entire discussion around observability and policy enforcement for LLM consumption has given rise to a class of solutions most frequently referred to as AI Firewalls or AI Gateways (AI GW). An AI FW might be leveraged by a browser plugin, or perhaps applying a software development kit (SDK) during the coding process for AI applications. Arguably, the most scalable and most easily deployed approach to inserting AI FW functionality into live traffic to LLMs is to use a reverse proxy. A modern approach includes the F5 Distributed Cloud service, coupled with an AI FW/GW service, cloud-based or self-hosted, that can inspect traffic intended for LLMs like those of OpenAI, Azure OpenAI, or privately operated LLMs like those downloaded from Hugging Face. A key value offered by this topology, a reverse proxy handing off LLM traffic to an AI FW, which in turn can allow traffic to reach target LLMs, stems from the fact that traffic is seen, and thus controllable, in both directions. Should an issue be present in a user’s submitted prompt, also known as an “inference”, it can be flagged: PII (Personally Identifiable Information) leakage is a frequent concern at this point. In addition, any LLM responses to prompts are also seen in the reverse path: consider a corrupted LLM providing toxicity in its generated replies. Not good. To achieve a highly performant reverse proxy approach to secured LLM access, a solution that can span a global set of users, F5 worked with Prompt Security to deploy an end-to-end AI security layer. This article will explore the efficacy and performance of the live solution. Impose LLM Guardrails with the AI Firewall and Distributed Cloud An AI firewall such as the Prompt Security offering can get in-line with AI LLM flows through multiple means. API calls from Curl or Postman can be modified to transmit to Prompt Security when trying to reach targets such as OpenAI or Azure OpenAI Service. Simple firewall rules can prevent employee direct access to these well-known API endpoints, thus making the Prompt Security route the sanctioned method of engaging with LLMs. A number of other methods could be considered but have concerns. Browser plug-ins have the advantage of working outside the encryption of the TLS layer, in a manner similar to how users can use a browser’s developer tools to clearly see targets and HTTP headers of HTTPS transactions encrypted on the wire. Prompt Security supports plugins. A downside, however, of browser plug-ins is the manageability issue, how to enforce and maintain across-the-board usage, simply consider the headache non-corporate assets used in the work environment. Another approach, interesting for non-browser, thick applications on desktops, think of an IDE like VSCode, might be an agent approach, whereby outbound traffic is handled by an on-board local proxy. Again, Prompt can fit in this model however the complexity of enforcement of the agent, like the browser approach, may not always be easy and aligned with complete A-to-Z security of all endpoints. One of the simplest approaches is to ingest LLM traffic through a network-centric approach. An F5 Distributed Cloud HTTPS load balancer, for instance, can ingest LLM-bound traffic, and thoroughly secure the traffic at the API layer, things like WAF policy and DDoS mitigations, as examples. HTTP-based control plane security is the focus here, as opposed to the encapsulated requests a user is sending to an LLM. The HTTPS load balancer can in turn hand off traffic intended for the likes of OpenAI to the AI gateway for prompt-aware inspections. F5 Distributed Cloud (XC) is a good architectural fit for inserting a third-party AI firewall service in-line with an organization’s inferencing requests. Simply project a FQDN for the consumption of AI services; in this article we used the domain name “llmsec.busdevF5.net” into the global DNS, advertising one single IP address mapping to the name. This DNS advertisement can be done with XC. The IP address, through BGP-4 support for anycast, will direct any traffic to this address to the closest of 27 international points of presence of the XC global fabric. Traffic from a user in Asia may be attracted to Singapore or Mumbai F5 sites, whereas a user in Western Europe might enter the F5 network in Paris or Frankfurt. As depicted, a distributed HTTPS load balancer can be configured – “distributed” reflects the fact traffic ingressing in any of the global sites can be intercepted by the load balancer. Normally, the server name indicator (SNI) value in the TLS Client Hello can be easily used to pick the correct load balancer to process this traffic. The first step in AI security is traditional reverse proxy core security features, all imposed by the XC load balancer. These features, to name just a few, might include geo-IP service policies to preclude traffic from regions, automatic malicious user detection, and API rate limiting; there are many capabilities bundled together. Clean traffic can then be selected for forwarding to an origin pool member, which is the standard operation of any load balancer. In this case, the Prompt Security service is the exclusive member of our origin pool. For this article, it is a cloud instantiated service - options exist to forward to Prompt implemented on a Kubernetes cluster or running on a Distributed Cloud AppStack Customer Edge (CE) node. Block Sensitive Data with Prompt Security In-Line AI inferences, upon reaching Prompt’s security service, are subjected to a wide breadth of security inspections. Some of the more important categories would include: Sensitive data leakage, although potentially contained in LLM responses, intuitively the larger proportion of risk is within the requesting prompt, with user perhaps inadvertently disclosing data which should not reach an LLM Source code fragments within submissions to LLMs, various programming languages may be scanned for and blocked, and the code may be enterprise intellectual property OWASP LLM top 10 high risk violations, such as LLM jailbreaking where the intent is to make the LLM behave and generate content that is not aligned with the service intentions; the goal may be embarrassing “screenshots”, such as having a chatbot for automobile vendor A actually recommend a vehicle from vendor B OWASP Prompt Injection detection, considered one of the most dangerous threats as the intention is for rogue users to exfiltrate valuable data from sources the LLM may have privileged access to, such as backend databases Token layer attacks, such as unauthorized and excessive use of tokens for LLM tasks, the so-called “Denial of Wallet” threat Content moderation, ensuring a safe interaction with LLMs devoid of toxicity, racial and gender discriminatory language and overall curated AI experience aligned with those productivity gains that LLMs promise To demonstrate sensitive data leakage protection, a Prompt Security policy was active which blocked LLM requests with, among many PII fields, a mailing address exposed. To reach OpenAI GPT3.5-Turbo, one of the most popular and cost-effective models in the OpenAI model lineup, prompts were sent to an F5 XC HTTPS load balancer at address llmsec.busdevf5.net. Traffic not violating the comprehensive F5 WAF security rules were proxied to the Prompt Security SaaS offering. The prompt below clearly involves a mailing address in the data portion. The ensuing prompt is intercepted by both the F5 and Prompt Security solutions. The first interception, the distributed HTTPS load balancer offered by F5 offers rich details on the transaction, and since no WAF rules or other security policies are violated, the transaction is forwarded to Prompt Security. The following demonstrates some of the interesting details surrounding the transaction, when completed (double-click to enlarge). As highlighted, the transaction was successful at the HTTP layer, producing a 200 Okay outcome. The traffic originated in the municipality of Ashton, in Canada, and was received into Distributed Cloud in F5’s Toronto (tr2-tor) RE site. The full details around the targeted URL path, such as the OpenAI /v1/chat/completions target and the user-agent involved, vscode-restclient, are both provided. Although the HTTP transaction was successful, the actual AI prompt was rejected, as hoped for, by Prompt Security. Drilling into the Activity Monitor in the Prompt UI, one can get a detailed verdict on the transaction (double-click). Following the yellow highlights above, the prompt was blocked, and the violation is “Sensitive Data”. The specific offending content, the New York City street address, is flagged as a precluded entity type of “mailing address”. Other fields that might be potentially blocking candidates with Prompt’s solution include various international passports or driver’s license formats, credit card numbers, emails, and IP addresses, to name but a few. A nice, time saving feature offered by the Prompt Security user interface is to simply choose an individual security framework of interest, such as GDPR or PCI, and the solution will automatically invoke related sensitive data types to detect. An important idea to grasp: The solution from Prompt is much more nuanced and advanced than simple REGEX; it invokes the power of AI itself to secure customer journeys into safe AI usage. Machine learning models, often transformer-based, have been fine-tuned and orchestrated to interpret the overall tone and tenor of prompts, gaining a real semantic understanding of what is being conveyed in the prompt to counteract simple obfuscation attempts. For instance, using printed numbers, such as one, two, three to circumvent Regex rules predicated on numerals being present - this will not succeed. This AI infused ability to interpret context and intent allows for preset industry guidelines for safe LLM enforcement. For instance, simply indicating the business sector is financial will allow the Prompt Security solution to pass judgement, and block if desired, financial reports, investment strategy documents and revenue audits, to name just a few. Similar awareness for sectors such as healthcare or insurance is simply a pull-down menu item away with the policy builder. Source Code Detection A common use case for LLM security solutions is identification and, potentially, blocking submissions of enterprise source code to LLM services. In this scenario, this small snippet of Python is delivered to the Prompt service: def trial(): return 2_500 <= sorted(choices(range(10_000), k=5))[2] < 7_500 sum(trial() for i in range(10_000)) / 10_000 A policy is in place for Python and JavaScript detection and was invoked as hoped for. curl --request POST \ --url https://llmsec.busdevf5.net/v1/chat/completions \ --header 'authorization: Bearer sk-oZU66yhyN7qhUjEHfmR5T3BlbkFJ5RFOI***********' \ --header 'content-type: application/json' \ --header 'user-agent: vscode-restclient' \ --data '{"model": "gpt-3.5-turbo","messages": [{"role": "user","content": "def trial():\n return 2_500 <= sorted(choices(range(10_000), k=5))[2] < 7_500\n\nsum(trial() for i in range(10_000)) / 10_000"}]}' Content Moderation for Interactions with LLMs One common manner of preventing LLM responses from veering into undesirable territory is for the service provider to implement a detailed system prompt, a set of guidelines that the LLM should be governed by when responding to user prompts. For instance, the system prompt might instruct the LLM to serve as polite, helpful and succinct assistant for customers purchasing shoes in an online e-commerce portal. A request for help involving the trafficking of narcotics should, intuitively, be denied. Defense in depth has traditionally meant no single point of failure. In the above scenario, screening both the user prompt and ensuring LLM response for a wide range of topics leads to a more ironclad security outcome. The following demonstrates some of the topics Prompt Security can intelligently seek out; in this simple example, the topic of “News & Politics” has been singled out to block as a demonstration. Testing can be performed with this easy Curl command, asking for a prediction on a possible election result in Canadian politics: curl --request POST \ --url https://llmsec.busdevf5.net/v1/chat/completions \ --header 'authorization: Bearer sk-oZU66yhyN7qhUjEHfmR5T3Blbk*************' \ --header 'content-type: application/json' \ --header 'user-agent: vscode-restclient' \ --data '{"model": "gpt-3.5-turbo","messages": [{"role": "user","content": "Who will win the upcoming Canadian federal election expected in 2025"}],"max_tokens": 250,"temperature": 0.7}' The response, available in the Prompt Security console, is also presented to the user. In this case, a Curl user leveraging the VSCode IDE. The response has been largely truncated for brevity, fields that are of interest is an HTTP “X-header” indicating the transaction utilized the F5 site in Toronto, and the number of tokens consumed in the request and response are also included. Advanced LLM Security Features Many of the AI security concerns are given prominence by the OWASP Top Ten for LLMs, an evolving and curated list of potential concerns around LLM usage from subject matter experts. Among these are prompt injection attacks and malicious instructions often perceived as benign by the LLM. Prompt Security uses a layered approach to thwart prompt injection. For instance, during the uptick in interest in ChatGPT, DAN (Do Anything Now) prompt injection was widespread and a very disruptive force, as discussed here. User prompts will be closely analyzed for the presence of the various DAN templates that have evolved over the past 18 months. More significantly, the use of AI itself allows the Prompt solution to recognize zero-day bespoke prompts attempting to conduct mischief. The interpretative powers of fine-tuned, purpose-built security inspection models are likely the only way to stay one step ahead of bad actors. Another chief concern is protection of the system prompt, the guidelines that reel in unwanted behavior of the offered LLM service, what instructed our LLM earlier in its role as a shoe sales assistant. The system prompt, if somehow manipulated, would be a significant breach in AI security, havoc could be created with an LLM directed astray. As such, Prompt Security offers a policy to compare the user provided prompt, the configured system prompt in the API call, and the response generated by the LLM. In the event that a similarity threshold with the system prompt is exceeded in the other fields, the transaction can be immediately blocked. An interesting advanced safeguard is the support for a “canary” word - a specific value that a well behaved LLM should never present in any response, ever. The detection of the canary word by the Prompt solution will raise an immediate alert. One particularly broad and powerful feature in the AI firewall is the ability to find secrets, meaning tokens or passwords, frequently for cloud-hosted services, that are revealed within user prompts. Prompt Security offers the ability to scour LLM traffic for in excess of 200 meaningful values. Just as a small representative sample of the industry’s breadth of secrets, these can all be detected and acted upon: Azure Storage Keys Detector Artifactory Detector Databricks API tokens GitLab credentials NYTimes Access Tokens Atlassian API Tokens Besides simple blocking, a useful redaction option can be chosen. Rather than risk compromise of credentials and obfuscated value will instead be seen at the LLM. F5 Positive Security Models for AI Endpoints The AI traffic delivered and received from Prompt Security’s AI firewall is both discovered and subjected to API layer policies by the F5 load balancer. Consider the token awareness features of the AI firewall, excessive token consumption can trigger an alert and even transaction blocking. This behavior, a boon when LLMs like the OpenAI premium GPT-4 models may have substantial costs, allows organizations to automatically shut down a malicious actor who illegitimately got hold of an OPENAI_API key value and bombarded the LLM with prompts. This is often referred to as a “Denial of Wallet” situation. F5 Distributed Cloud, with its focus upon the API layer, has congruent safeguards. Each unique user of an API service is tracked to monitor transactional consumption. By setting safeguards for API rate limiting, an excessive load placed upon the API endpoint will result in HTTP 429 “Too Many Request” in response to abusive behavior. A key feature of F5 API Security is the fact that it is actionable in both directions, and also an in-line offering, unlike some API solutions which reside out of band and consume proxy logs for reporting and threat detection. With the automatic discovery of API endpoints, as seen in the following screenshot, the F5 administrator can see the full URL path which in this case exercises the familiar OpenAI /v1/chat/completions endpoint. As highlighted by the arrow, the schema of traffic to API endpoints is fully downloadable as an OpenAPI Specification (OAS), formerly known as a Swagger file. This layer of security means fields in API headers and bodies can be validated for syntax, such that a field whose schema expects a floating-point number can see any different encoding, such as a string, blocked in real-time in either direction. A possible and valuable use case: allow an initial unfettered access to a service such as OpenAI, by means of Prompt Security’s AI firewall service, for a matter of perhaps 48 hours. After a baseline of API endpoints has been observed, the API definition can be loaded from any saved Swagger files at the end of this “observation” period. The loaded version can be fully pruned of undesirable or disallowed endpoints, all future traffic must conform or be dropped. This is an example of a “positive security model”, considered a gold standard by many risk-adverse organizations. Simply put, a positive security model allows what has been agreed upon through and rejects everything else. This ability to learn and review your own traffic, and then only present Prompt Security with LLM endpoints that an organization wants exposed is an interesting example of complementing an AI security solution with rich API layer features. Summary The world of AI and LLMs is rapidly seeing investment, in time and money, from virtually all economic sectors; the promise of rapid dividends in the knowledge economy is hard to resist. As with any rapid deployment of new technology, safe consumption is not guaranteed, and it is not built in. Although LLMs often suggest guardrails are baked into offerings, a 30-second search of the Internet will expose firsthand experiences where unexpected outcomes when invoking AI are real. Brand reputation is at stake and false information can be hallucinated or coerced out of LLMs by determined parties. By combining the ability to ingest globally at high-speed dispersed users and apply a first level of security protections, F5 Distributed Cloud can be leveraged as an onboarding for LLM workloads. As depicted in this article, Prompt Security can in turn handle traffic egressing F5’s distributed HTTPS load balancers and provide state-of-the-art AI safeguards, including sensitive data detection, content moderation and other OWASP-aligned mechanisms like jailbreak and prompt injection mitigation. Other deployment models exist, including deploying Prompt Security’s solution on-premises, self-hosted in cloud tenants, and running the solution on Distributed Cloud CE nodes themselves is supported.
