General help with custom vulnerability signature

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L4 Transporter

General help with custom vulnerability signature

Can someone provide documentation and insight in regards to creating custom IPS signatures based on the follow scenario?

Consider you have an FTP server. The USER command is vulnerable to buffer overflow. How does one create a custom signature to identify and block this activity? The buffer and payload the attack sends could have 1000 variations.

If the vulnerability is simple triggered by sending over 20 characters to it...

An attacker could send 100 A's. We could easily build a signature that watches for 100 \x41. But if they sent a payload of 100 \x42 and caused the crash, the custom signature would not match.

L7 Applicator

Re: General help with custom vulnerability signature

Hello SDorsey,

Could you please try this:

FTP-custom-signature-2.JPG

FTP-custom-signature-1.JPG

FTP-custom-signature.JPG

Thanks

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