============================================================================
Ubuntu Security Notice USN-2607-1
May 12, 2015

libmodule-signature-perl vulnerabilities
============================================================================

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

- Ubuntu 15.04
- Ubuntu 14.10
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS

Summary:

Several security issues were fixed in Module::Signature.

Software Description:
- libmodule-signature-perl: module to manipulate CPAN SIGNATURE files

Details:

John Lightsey discovered that Module::Signature incorrectly handled PGP
signature boundaries. A remote attacker could use this issue to trick
Module::Signature into parsing the unsigned portion of the SIGNATURE file
as the signed portion. (CVE-2015-3406)

John Lightsey discovered that Module::Signature incorrectly handled files
that were not listed in the SIGNATURE file. A remote attacker could use
this flaw to execute arbitrary code when tests were run. (CVE-2015-3407)

John Lightsey discovered that Module::Signature incorrectly handled
embedded shell commands in the SIGNATURE file. A remote attacker could use
this issue to execute arbitrary code during signature verification.
(CVE-2015-3408)

John Lightsey discovered that Module::Signature incorrectly handled module
loading. A remote attacker could use this issue to execute arbitrary code
during signature verification. (CVE-2015-3409)

Update instructions:

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

Ubuntu 15.04:
  libmodule-signature-perl        0.73-1ubuntu0.15.04.1

Ubuntu 14.10:
  libmodule-signature-perl        0.73-1ubuntu0.14.10.1

Ubuntu 14.04 LTS:
  libmodule-signature-perl        0.73-1ubuntu0.14.04.1

Ubuntu 12.04 LTS:
  libmodule-signature-perl        0.68-1ubuntu0.12.04.2

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

References:
  http://www.ubuntu.com/usn/usn-2607-1
  CVE-2015-3406, CVE-2015-3407, CVE-2015-3408, CVE-2015-3409

Package Information:

https://launchpad.net/ubuntu/+source/libmodule-signature-perl/0.73-1ubuntu0.15.04.1

https://launchpad.net/ubuntu/+source/libmodule-signature-perl/0.73-1ubuntu0.14.10.1

https://launchpad.net/ubuntu/+source/libmodule-signature-perl/0.73-1ubuntu0.14.04.1

https://launchpad.net/ubuntu/+source/libmodule-signature-perl/0.68-1ubuntu0.12.04.2