FreeBSD-SA-06:24.libarchive Security Advisory
The FreeBSD Project
Topic: Infinite loop in corrupt archives handling in libarchive(3)
Credits: Rink Springer
Affects: FreeBSD 6-STABLE after 2006-09-05 05:23:51 UTC
Corrected: 2006-11-08 14:05:40 UTC (RELENG_6, 6.2-RC1)
CVE Name: CVE-2006-5680
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The libarchive library provides a flexible interface for reading and
writing streaming archive files such as tar and cpio, and has been the
basis for FreeBSD's implementation of the tar(1) utility since FreeBSD 5.3.
II. Problem Description
If the end of an archive is reached while attempting to "skip" past a
region of an archive, libarchive will enter an infinite loop wherein it
repeatedly attempts (and fails) to read further data.
An attacker able to cause a system to extract (via "tar -x" or another
application which uses libarchive) or list the contents (via "tar -t" or
another libarchive-using application) of an archive provided by the
attacker can cause libarchive to enter an infinite loop and use all
available CPU time.
No workaround is available.
Perform one of the following:
1) Upgrade your vulnerable system to 6-STABLE dated after the correction
2) To patch your present system:
The following patches have been verified to apply to affected systems.
a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.