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
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Subject: Snort Rule Matching Backtrack Denial of Service Vulnerability
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