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libarchive (formerly named as bsdtar): Multiple PaX Extension Header Vulnerabilities


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200708-03 / libarchive
Release Date August 08, 2007
Latest Revision August 08, 2007: 02
Impact normal
Exploitable remote
Package Vulnerable versions Unaffected versions Architecture(s)
app-arch/libarchive < 2.2.4 >= 2.2.4 All supported architectures

Related bugreports: #184984


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.

2.  Impact Information


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


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.


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.

3.  Resolution Information


There is no known workaround at this time.


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

Code Listing 3.1: Resolution

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

4.  References


Page updated August 08, 2007

Summary: This is a Gentoo Linux Security Advisory

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