libmodule-signature-perl vulnerabilities

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)