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Gentoo Linux Security Advisory GLSA 200708-03
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http://security.gentoo.org/
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Severity: Normal
Title: libarchive (formerly named as bsdtar): Multiple pax
Extension Header Vulnerabilities
Date: August 08, 2007
Bugs: #184984
ID: 200708-03

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Synopsis
========

Multiple vulnerabilities were found in libarchive (formerly named as
app-archive/bsdtar), possibly allowing for the execution of arbitrary
code or a Denial of Service.

Background
==========

libarchive is a library for manipulating different streaming archive
formats, including certain tar variants, several cpio formats, and both
BSD and GNU ar variants.

Affected packages
=================

-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 app-arch/libarchive < 2.2.4 >= 2.2.4

Description
===========

CPNI, CERT-FI, Tim Kientzle, and Colin Percival reported a buffer
overflow (CVE-2007-3641), an infinite loop (CVE-2007-3644), and a NULL
pointer dereference (CVE-2007-3645) within the processing of archives
having corrupted PaX extension headers.

Impact
======

An attacker can trick a user or automated system to process an archive
with malformed PaX extension headers into execute arbitrary code, crash
an application using the library, or cause a high CPU load.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All libarchive or bsdtar users should upgrade to the latest libarchive
version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=app-arch/libarchive-2.2.4"

References
==========

[ 1 ] CVE-2007-3641
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3641
[ 2 ] CVE-2007-3644
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3644
[ 3 ] CVE-2007-3645
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3645

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

http://security.gentoo.org/glsa/glsa-200708-03.xml

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security (at) gentoo (dot) org [email concealed] or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2007 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.5
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