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

[GLSA]

Gentoo Linux Security Advisory

Title: Perl Module-Signature module: Arbitrary code execution (GLSA 201310-01)
Severity: normal
Exploitable: remote
Date: October 04, 2013
Bug(s): #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: dev-perl/Module-Signature
Vulnerable: < 0.720.0
Unaffected: >= 0.720.0
Architectures: 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: