topic Re: Havij SQL Injection Filter in General Topics

Havij SQL Injection Filter

rodrigum — Tue, 07 Jun 2011 16:37:01 GMT

There doesn't seem to be a filter for this vulnerability at this time so I am trying to write one. By default the program uses its name in the agent string;

Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727) Havij

I am trying to create a vulnerability filter that looks for "Havij" in the agent string, my belief based on what I have read is the filter should read something like pattern-match http-req-headers, where I am stuck though is the value, since it has to be at least 7 bytes, is there a way to pad "Havij" so it meets the requirement? Or am I going about this wrong.

Thanks.

Re: Havij SQL Injection Filter

migration — Tue, 07 Jun 2011 16:57:14 GMT

In this case you don't have to create a Custom Vulnerability Signature but a Custom Application Signature, in the way you have told and creating a security policy with the deny action for that application.

You have to use "http-req-headers" and insert "Havij" as pattern match. This should works.

Re: Havij SQL Injection Filter

rodrigum — Tue, 07 Jun 2011 18:05:55 GMT

Same error, "must be at least 7 bytes". I am running 3.1 if that helps.

Thanks.

Re: Havij SQL Injection Filter

bpappas — Tue, 07 Jun 2011 18:19:03 GMT

if you do not have a 7 byte anchor for your data pattern then you will get that error.

In your case your data pattern is not long enough. Can you pad the pattern with additional characters?

Re: Havij SQL Injection Filter

rodrigum — Tue, 07 Jun 2011 18:22:35 GMT

The string I posted above is what is passed, is there an easy way to use that to create the match string included in it the padding I need/

Re: Havij SQL Injection Filter

bpappas — Tue, 07 Jun 2011 18:31:31 GMT

Have you tried this:

\)\ Havij