bugtraq - SNORT Incorrect fragmented packet reassembly

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Message-ID: <20060217145146.31016.qmail@securityfocus.com>
Date: 17 Feb 2006 14:51:46 -0000
From: siouxsie@...heogen.ru
To: bugtraq@...urityfocus.com
Subject: SNORT Incorrect fragmented packet reassembly

Snort 2.4.3 has a bug in processing fragmented ip packets which has ip options. frag3 preprocessor of snort skips [ip_option_length] bytes from end of the ip options when reassembling packet, thus allowing anyone to evade ids.

Guys at snort.org already informed and are fixing the problem.