Snort "uricontent" rule bypass
| snort-uricontent-rule-bypass (26855) |  Medium Risk |
Description:
Snort could allow a remote attacker to bypass 'uricontent' rules and possibly eveade detection. A remote attacker could exploit this vulnerability by sending a specially-crafted URL request containing a carriage return before the HTTP protocol declaration.
Platforms Affected:
- Snort, Snort 2.4
- Snort, Snort 2.4.1
- Snort, Snort 2.4.2
- Snort, Snort 2.4.3
- Snort, Snort 2.4.4
Remedy:
Upgrade to the latest version of Snort (2.4.5 - 2.6.0 or later), available from the Snort Web site. See References.
Consequences:
Bypass Security
References:
- BugTraq Mailing List, Wed May 31 2006 - 19:19:41 CDT , Snort HTTP Inspect Pre-Processor Uricontent Bypass at http://archives.neohapsis.com/archives/bugtraq/2006-05/0706.html.
- DEMARC Security, Inc. Web site, Snort Bypass Vulnerability at http://www.demarc.com/support/downloads/patch_20060531.
- Snort Web site, Snort.org at http://www.snort.org/.
- BID-18200: Snort URIContent Rules Detection Evasion Vulnerability
- CVE-2006-2769: The HTTP Inspect preprocessor (http_inspect) in Snort 2.4.0 through 2.4.4 allows remote attackers to bypass uricontent rules via a carriage return (\r) after the URL and before the HTTP declaration.
- OSVDB ID: 25837: Snort HTTP Inspect Pre-Processor Uricontent Bypass
- SA20413: Snort "http_inspect" Preprocessor Bypass Vulnerability
- SECTRACK ID: 1016191: Snort Lets Remote Users Bypass `uricontent` Rules
- SUSE-SR:2006:014: SUSE Security Summary Report
- VUPEN/ADV-2006-2119: Snort http_inspect Preprocessor URL Handling Detection Bypass Vulnerability
Reported:
May 31, 2006
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