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TITLE:
Snort "http_inspect" Preprocessor Bypass Vulnerability

SECUNIA ADVISORY ID:
SA20413

VERIFY ADVISORY:
http://secunia.com/advisories/20413/

CRITICAL:
Moderately critical

IMPACT:
Security Bypass

WHERE:
>From remote

SOFTWARE:
Snort 2.4.x
http://secunia.com/product/5691/

DESCRIPTION:
Blake Hartstein has reported a vulnerability in Snort, which can be
exploited by malicious people to bypass certain security
restrictions.

The vulnerability is caused due to an error in the "http_inspect"
preprocessor when inspecting HTTP requests that contain a carriage
return character at the end of the URL. This can be exploited to
bypass detection rules that use the "uricontent" keyword via a
specially-crafted HTTP request.

Successful exploitation requires that the protected web server
supports special characters in HTTP requests (e.g. Apache web
server).

The vulnerability has been reported in versions 2.4.x and 2.6.0
(beta).

SOLUTION:
The vulnerability will reportedly be fixed in versions 2.4.5 and
2.6.0 final on 2006-06-05.

PROVIDED AND/OR DISCOVERED BY:
Blake Hartstein, Demarc Threat Research Team.

ORIGINAL ADVISORY:
Snort:
http://www.snort.org/pub-bin/snortnews.cgi#431

Demarc:
http://www.demarc.com/support/downloads/patch_20060531

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