A new security update has been released for Gentoo Linux - git: Multiple vulnerabilties. Here the announcement:

Gentoo Linux Security Advisory GLSA 200903-15
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http://security.gentoo.org/
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Severity: High
Title: git: Multiple vulnerabilties
Date: March 09, 2009
Bugs: #251343
ID: 200903-15

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Synopsis
========

Multiple vulnerabilities in gitweb allow for remote execution of
arbitrary commands.

Background
==========

GIT - the stupid content tracker, the revision control system used by
the Linux kernel team.

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

-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 dev-util/git < 1.6.0.6 >= 1.6.0.6

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

Multiple vulnerabilities have been reported in gitweb that is part of
the git package:

* Shell metacharacters related to git_search are not properly
sanitized (CVE-2008-5516).

* Shell metacharacters related to git_snapshot and git_object are not
properly sanitized (CVE-2008-5517).

* The diff.external configuration variable as set in a repository can
be executed by gitweb (CVE-2008-5916).

Impact
======

A remote unauthenticated attacker can execute arbitrary commands via
shell metacharacters in a query, remote attackers with write access to
a git repository configuration can execute arbitrary commands with the
privileges of the user running gitweb by modifying the diff.external
configuration variable in the repository and sending a crafted query to
gitweb.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All git users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=dev-util/git-1.6.0.6"

References
==========

[ 1 ] CVE-2008-5516
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-5516
[ 2 ] CVE-2008-5517
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-5517
[ 3 ] CVE-2008-5916
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-5916

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

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

http://security.gentoo.org/glsa/glsa-200903-15.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@gentoo.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2009 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