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CVE-2005-2019

Status Candidate

Overview

ipfw in FreeBSD 5.4, when running on Symmetric Multi-Processor (SMP) or Uni Processor (UP) systems with the PREEMPTION kernel option enabled, does not sufficiently lock certain resources while performing table lookups, which can cause the cache results to be corrupted during multiple concurrent lookups, allowing remote attackers to bypass intended access restrictions.

Related Files

FreeBSD-SA-05-13.ipfw.txt
Posted Jul 1, 2005
Site freebsd.org

FreeBSD Security Advisory FreeBSD-SA-05:13 - The ipfw tables lookup code caches the result of the last query. The kernel may process multiple packets concurrently, performing several concurrent table lookups. Due to an insufficient locking, a cached result can become corrupted that could cause some addresses to be incorrectly matched against a lookup table.

tags | advisory, kernel
systems | freebsd
advisories | CVE-2005-2019
SHA-256 | 6b7aa2a12074c968569303a922ef2f40cc26ef0aef04894d3fd3b9ebce0d5e08
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