USN-1896-1: Module::Signature perl module vulnerability

3 July 2013

libmodule-signature-perl vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 13.04
  • Ubuntu 12.10
  • Ubuntu 12.04 LTS


Module::Signature could be made to run programs if it verified a signature.

Software Description

  • libmodule-signature-perl - module to manipulate CPAN SIGNATURE files


Florian Weimer discovered that the Module::Signature perl module incorrectly loaded unknown ciphers from relative directories. An attacker could possibly use this flaw to execute arbitrary code when a signature is verified.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 13.04
libmodule-signature-perl - 0.68-1ubuntu0.13.04.1
Ubuntu 12.10
libmodule-signature-perl - 0.68-1ubuntu0.12.10.1
Ubuntu 12.04 LTS
libmodule-signature-perl - 0.68-1ubuntu0.12.04.1

To update your system, please follow these instructions:

In general, a standard system update will make all the necessary changes.