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FreeBSD ipfw Packet Matching Security Issue
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Secunia Advisory:
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SA15871
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Release Date:
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2005-06-30
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Popularity:
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6,982 views
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Critical:
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Less critical
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Impact:
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Security Bypass
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Where:
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From remote
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Solution Status:
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Vendor Patch
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| OS: | FreeBSD 5.x
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| | CVE reference: | CVE-2005-2019
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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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About this Secunia Advisory
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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.
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