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Last updated: 11/26/2014 1:43:16 PM

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National Cyber Awareness System

Vulnerability Summary for CVE-2006-6931

Original release date: 01/16/2007
Last revised: 09/15/2010


Algorithmic complexity vulnerability in Snort before 2.6.1, during predicate evaluation in rule matching for certain rules, allows remote attackers to cause a denial of service (CPU consumption and detection outage) via crafted network traffic, aka a "backtracking attack."


CVSS Severity (version 2.0):
CVSS v2 Base Score: 5.0 (MEDIUM) (AV:N/AC:L/Au:N/C:N/I:N/A:P) (legend)
Impact Subscore: 2.9
Exploitability Subscore: 10.0
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: Low
Authentication: Not required to exploit
Impact Type: Allows disruption of service

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External Source: SECUNIA
Name: 24338
External Source: SECTRACK
Name: 1017508
External Source: MISC
Name: http://www.acsac.org/2006/papers/54.pdf
Type: Advisory
External Source: SECUNIA
Name: 23716
External Source: MISC
Name: http://www.acsac.org/2006/abstracts/54.html
External Source: MISC
Name: http://www.cs.wisc.edu/~smithr/pubs/randy_smith_acsac2006.zip
External Source: MISC
Name: http://www.cs.wisc.edu/~smithr/pubs/acsac2006.pdf
Type: Advisory
External Source: MLIST
Name: [dailydave] 20070110 Algorithmic Bugs
External Source: GENTOO
Name: GLSA-200702-03
External Source: CONFIRM
Name: http://www.snort.org/pub-bin/snortnews.cgi
External Source: MANDRIVA
Name: MDKSA-2007:051
External Source: XF
Name: snort-rule-matching-dos(31430)
External Source: BID
Name: 21991
External Source: SECUNIA
Name: 24164
External Source: MISC
Name: http://www.acsac.org/2006/advance_program.html
External Source: OSVDB
Name: 32096

Vulnerable software and versions

+ Configuration 1
+ OR
* cpe:/a:snort:snort:2.6.2 and previous versions

* Denotes Vulnerable Software
Changes related to vulnerability configurations

Technical Details

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