GLSA 201310-01: Perl Module-Signature module: Arbitrary code execution

http://security.gentoo.org/

Severity:	normal
Title:	Perl Module-Signature module: Arbitrary code execution
Date:	10/04/2013
Bugs:	#472428
ID:	201310-01

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	Architecture(s)
dev-perl/Module-Signature	< 0.720.0	>= 0.720.0	All supported architectures

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 --verbose
      ">=dev-perl/Module-Signature-0.720.0"

References

CVE-2013-2145

Availability

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