Randy Smith, Christian Estan, and Somesh Jha have reported a vulnerability in Snort, which potentially can be exploited by malicious people to cause a DoS (Denial of Service).
The problem is that the rule matching algorithm of Snort can be exploited to perform numerous time-consuming operations, which may lead to a decreased or zero detection rate via a specially crafted packet.
The vulnerability is reported in version 2.4.3. Other versions may also be affected.
Solution: Update to version 2.6.1 or later.
Provided and/or discovered by: Randy Smith, Christian Estan, and Somesh Jha, University of Wisconsin-Madison
Original Advisory: http://www.cs.wisc.edu/~smithr/pubs/acsac2006.pdf
Do you have additional information related to this advisory?
Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this
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Subject: Snort Rule Matching Backtrack Denial of Service Vulnerability
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