A vulnerability has been identified in Snort, which could be exploited by remote attackers to bypass security restrictions. This issue is caused by an error when validating and comparing the Time To Live (TTL) value of fragmented IP packets, which could allow an attacker to bypass all Snort rules by sending fragmented IP packets to an affected host, ensuring that the TTL difference is greater than the configured maximum (by default, the maximum difference is 5).
Credits
Vulnerability reported by Silvio Cesare.
ChangeLog
2008-05-21 : Initial release
Vulnerability Management
Subscribe to FrSIRT VNS and receive real-time e-mail and SMS alerts when new vulnerabilities, exploits, or patches relevant to your systems and network configurations are available.
Feedback
If you have additional information or corrections for this security advisory please submit them via our contact form or by email to updates@frsirt.com.
French
