About Custom Vulnerability Signature

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About Custom Vulnerability Signature

L4 Transporter


My customer made vulnerability signature in FW. But FW doesn't detect this signature.

Customer Vulnerability Signature

context : http-req-message-body

pattern : eval\(gzinflate\(str_rot13\(base64_decode

I am searching this but I don't know.

So I need your assistance for it.

I have read Creating_Custom_Signatures-RevA.pdf document  

This document describe as the following message.


Description: Body content of a HTTP request when the body content cannot be recognized as URL encoded or MIME type data using the Content-type field.

Do you know to relate between not detecting signature and this description??



L4 Transporter


Can you get a pcap of the traffic flow including the pattern shown?  I am not aware of how this string is used?  (inbound to your servers of outbound from internal users) Also is the traffic encrypted? If so you wil need to decrypt it,


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