iDefense Security Advisory 05.21.08 - Remote exploitation of a design error vulnerability in Snort, as included in various vendors' operating system distributions, could allow an attacker to bypass filter rules. Due to a design error vulnerability, Snort does not properly reassemble fragmented IP packets. When receiving incoming fragments, Snort checks the Time To Live (TTL) value of the fragment, and compares it to the TTL of the initial fragment. If the difference between the initial fragment and the following fragments is more than a configured amount, the fragments will be silently discard. This results in valid traffic not being examined and/or filtered by Snort. iDefense has confirmed the existence of this vulnerability in Snort 2.8 and 2.6. Snort 2.4 is not vulnerable.
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