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FreeBSD ipfw Packet Matching Security Issue
Secunia Advisory: SA15871
Release Date: 2005-06-30
Popularity: 6,982 views

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

OS:FreeBSD 5.x

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CVE reference:CVE-2005-2019


Description:
A security issue has been reported in FreeBSD, which can be exploited by malicious people to bypass the firewall ruleset.

The problem is caused due to insufficient concurrency handling in the ipfw tables lookup code. This may lead to the corruption of cached address entries and cause some packets to be incorrectly matched.

Successful exploitation may allow some packets to pass through the firewall when they should have been dropped.

The security issue only affects Symmetric Multi-Processor (SMP) systems, or Uni-Processor (UP) systems with the non-default PREEMPTION kernel option enabled.

Solution:
Update FreeBSD or apply patch.

Fixed versions:
2005-06-29 21:38:48 UTC (RELENG_5, 5.4-STABLE)
2005-06-29 21:41:03 UTC (RELENG_5_4, 5.4-RELEASE-p3)

Patch for FreeBSD 5.x:
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:13/ipfw.patch
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:13/ipfw.patch.asc

Provided and/or discovered by:
The vendor credits Max Laier.

Original Advisory:
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-05:13.ipfw.asc


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