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f5mkuDefault's avatar
f5mkuDefault
Icon for Cirrus rankCirrus
Feb 26, 2021

3rd party vulnerability scan

Hi Experts,

 

I'd like to get some help with another issue.

 

We have this new 3rd party vendor that will be scanning the webservices hosted in LTM. The Big-IP also runs with ASM.

We tested between 15 virtual servers and only 1 is able to scan successfully.

 

Is there a setting that we need to perform on the Big-IP level to make the scan successfully work?

Is there a setting at real server level that we also need to adjust?

 

The virtual server by the way does port forwarding from port 443 to port 80 and there is certificate installed in F5 clientssl.

 

Hoping someone can advise.

 

Thank you in advance,

application delivery
ASM Advanced WAF
LTM
VAscan

4 Replies

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  • PeteWhite's avatar
    PeteWhite
    Icon for Employee rankEmployee
    Feb 26, 2021

    What do you mean by "We tested between 15 virtual servers and only 1 is able to scan successfully". How does it fail? This does not sound like an F5 problem - can they get basic access to the service? Is ASM blocking the malicious traffic?

    • f5mkuDefault's avatar
      f5mkuDefault
      Icon for Cirrus rankCirrus
      Mar 02, 2021

      Hi Pete, sorry for late response. We actually tested again focused on 1 specific website and confirmed that the scanner is able to hit the main page of the website. However the scan will stop. Base from the ASM we see some events from scanner to VS hitting some page. It looks like the real server is the one causing some issues. Not too sure if its a permission issue. Any idea what we need to adjust on the real server end?

      • f5mkuDefault's avatar
        f5mkuDefault
        Icon for Cirrus rankCirrus
        Mar 02, 2021

        yes, the webservices works fine for the users, this is what we keep mentioning to the vendor, also in ASM event logs we can see ASM is recommending to block but the response is not accepted. means F5 don't accept the recommendation since we have whitelisted the scanner IP address. With or without the ASM is just the same, we suspect its on the webserver (real server) maybe some permission gets denied since scanner can hit the main page but subpages cannot.

         

        we'll update this thread once it gets resolve. thank yiou