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Snort Fragmented IP Packets TTL Security Bypass

Secunia Advisory: SA30348  
Release Date: 2008-05-22

Critical:
Less critical
Impact: Security Bypass
Where: From remote
Solution Status: Vendor Patch

Software:Snort 2.6.x
Snort 2.8.x

CVE reference:CVE-2008-1804 (Secunia mirror)

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Description:
A vulnerability has been reported in Snort, which can be exploited by malicious people to bypass certain security restrictions.

The vulnerability is caused due to an error in the processing of fragmented IP packets. This can be exploited to bypass Snort rules by sending fragmented IP packets with an overly large TTL (Time To Live) difference between fragments.

The vulnerability is reported in versions 2.6 and 2.8. Prior versions may also be affected.

Solution:
Update to version 2.8.1.

Provided and/or discovered by:
Silvio Cesare, reported via iDefense

Original Advisory:
iDefense:
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=701

Extended Solution:
The "Extended Solution" section is available for Secunia customers only. Request a trial and get access to the Secunia Customer Area and Extended Secunia advisories.



Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.

Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.

2 Related Secunia Security Advisories

1. Snort DCE/RPC Preprocessor Buffer Overflow
2. Snort Rule Matching Backtrack Denial of Service Vulnerability


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