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AUSCERT External Security Bulletin Redistribution
ESB-2006.0815 -- [UNIX/Linux][FreeBSD]
Infinite loop in corrupt archives handling in libarchive(3)
9 November 2006
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AusCERT Security Bulletin Summary
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Product: libarchive
Publisher: FreeBSD
Operating System: FreeBSD
UNIX variants (UNIX, Linux, OSX)
Impact: Denial of Service
Access: Existing Account
CVE Names: CVE-2006-5680
Original Bulletin:
ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-06:24.libarchive.asc
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FreeBSD-SA-06:24.libarchive Security Advisory
The FreeBSD Project
Topic: Infinite loop in corrupt archives handling in libarchive(3)
Category: core
Module: libarchive
Announced: 2006-11-08
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
For general information regarding FreeBSD Security Advisories,
including descriptions of the fields above, security branches, and the
following sections, please visit <URL:http://security.FreeBSD.org/>.
I. Background
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.
III. Impact
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.
IV. Workaround
No workaround is available.
V. Solution
Perform one of the following:
1) Upgrade your vulnerable system to 6-STABLE dated after the correction
date.
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.
# fetch http://security.FreeBSD.org/patches/SA-06:24/libarchive.patch
# fetch http://security.FreeBSD.org/patches/SA-06:24/libarchive.patch.asc
b) Execute the following commands as root:
# cd /usr/src
# patch < /path/to/patch
# cd /usr/src/lib/libarchive
# make obj && make depend && make && make install
VI. Correction details
The following list contains the revision numbers of each file that was
corrected in FreeBSD.
Branch Revision
Path
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RELENG_6
src/lib/libarchive/archive_read_support_compression_none.c 1.6.2.2
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VII. References
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-5680
The latest revision of this advisory is available at
http://security.FreeBSD.org/advisories/FreeBSD-SA-06:24.libarchive.asc
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