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Gentoo Linux Security Advisory                           GLSA 201310-01
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                                            https://security.gentoo.org/
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 Severity: Normal
    Title: Perl Module-Signature module: Arbitrary code execution
     Date: October 04, 2013
     Bugs: #472428
       ID: 201310-01

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Synopsis
========

The Module-Signature module for Perl has insufficient path checks,
allowing a remote attacker to execute arbitrary Perl code.

Background
==========

The Perl Module::Signature module adds signing capabilities to CPAN
modules.

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

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  dev-perl/Module-Signature
                                 < 0.720.0                 >= 0.720.0

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

The 'cpansign verify' command will automatically download keys and use
them to check the signature of CPAN packages via the SIGNATURE file. If
an attacker were to replace this (SHA1) with a special unknown cipher
(e.g. 'Special') and were to include in the distribution a
'Digest/Special.pm', the code in this Perl module would be executed
when 'cpansign -verify' is run.

Impact
======

A remote attacker could possibly execute arbitrary code with the
privileges of the process.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All users of the Module-Signature Perl module should upgrade to the
latest version:

  # emerge --sync
  # emerge --ask --oneshot -v ">=dev-perl/Module-Signature-0.720.0"

References
==========

[ 1 ] CVE-2013-2145
      https://nvd.nist.gov/nvd.cfm?cvename=CVE-2013-2145

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

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

 https://security.gentoo.org/glsa/glsa-201310-01.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
https://bugs.gentoo.org.

License
=======

Copyright 2013 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.

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