A libarchive security update has been released for Debian GNU/Linux

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Debian Security Advisory DSA-2413-1 security@debian.org
http://www.debian.org/security/ Luk Claes
February 20, 2012 http://www.debian.org/security/faq
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Package : libarchive
Vulnerability : buffer overflows
Problem type : remote/local
Debian-specific: no
CVE ID : CVE-2011-1777 CVE-2011-1778

Two buffer overflows have been discovered in libarchive, a library
providing a flexible interface for reading and writing archives in
various formats. The possible buffer overflows while reading is9660
or tar streams allow remote attackers to execute arbitrary
code depending on the application that makes use of this functionality.

For the stable distribution (squeeze), this problem has been fixed in
version 2.8.4-1+squeeze1.

For the testing (wheezy) and unstable (sid) distributions,
this problem has been fixed in version 2.8.5-5.

We recommend that you upgrade your libarchive packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: http://www.debian.org/security/