libmodule-signature-perl - security update

John Lightsey discovered multiple vulnerabilities in Module::Signature,
a Perl module to manipulate CPAN SIGNATURE files. The Common
Vulnerabilities and Exposures project identifies the following problems:

• CVE-2015-3406
  Module::Signature could parse the unsigned portion of the SIGNATURE
  file as the signed portion due to incorrect handling of PGP signature
  boundaries.
• CVE-2015-3407
  Module::Signature incorrectly handled files that are not listed in
  the SIGNATURE file. This includes some files in the t/ directory
  that would execute when tests are run.
• CVE-2015-3408
  Module::Signature used two argument open() calls to read the files
  when generating checksums from the signed manifest. This allowed to
  embed arbitrary shell commands into the SIGNATURE file that would be
  executed during the signature verification process.
• CVE-2015-3409
  Module::Signature incorrectly handled module loading, allowing to
  load modules from relative paths in @INC. A remote attacker
  providing a malicious module could use this issue to execute
  arbitrary code during signature verification.

For the squeeze distribution, these issues have been fixed in version
0.63-1+squeeze2 of libmodule-signature-perl. Please note that the
libtest-signature-perl package was also updated for compatibility with
the CVE-2015-3407 fix.

We recommend that you upgrade your libmodule-signature-perl and
libtest-signature-perl packages.