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omar_padilla's avatar
omar_padilla
Icon for Altocumulus rankAltocumulus
Dec 01, 2020

protect cloudfront service whit asm VE AWS

Hello, I am trying to protect a web application that is hosted in aws, but it turns out that before directing the traffic to the backend servers first for a cdn, (cloudfront), the F5 is in front of the coudfront, the traffic is seen entering the F5 However, when the traffic is sent to the backed (cloudfront) I see ssl proxy problems in the logs, when I remove the ssl profiles (client and server) the service works, I have checked that the profiles are well created, in the captures you see that there is a problem with the ssl negotiation with the backed (ckoudfront), if the cloudfront is consumed directly by https it works correctly

 

pcap

 

ASM Advanced WAF
AWS
cloud
  • Simon_Blakely's avatar
    Simon_Blakely
    Icon for Employee rankEmployee
    Dec 01, 2020

    Well, it looks like the ServerHello from the Cloudfront server does not meet the server-ssl profile requirements, and the BigIP terminates the connection. You have to figure out what works, and make sure that the server-ssl profile matches.

     

    Look at the incoming client-side ClientHello. The outgoing server-side ClientHello needs to match as closely as possible. Check for a Server-Name Indication extension on the server-side. Check the supported TLS protocols and ciphers.

     

    Craft a specific server-ssl profile to ensure that as closely as possible, the ClientHello requests match.