Re: FreeBSD Security Advisory FreeBSD-SA-06:24.libarchive

On Wednesday 08 November 2006 08:13, FreeBSD Security Advisories
wrote:
===================================================================
========== 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
-------------------------------------------------------------------
------ RELENG_6
src/lib/libarchive/archive_read_support_compression_none.c
1.6.2.2
-------------------------------------------------------------------
------

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.

Maybe this is an obvious question, but libarchive has been in the
system since 5.3, but this issue only affects RELENG_6? So anyone
tracking RELENG_6_1 isn't affected?

--
Thanks,

Josh Paetzel
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