The cpansign verify functionality in the Module::Signature module before 0.72 for Perl allows attackers to bypass the signature check and execute arbitrary code via a SIGNATURE file with a “special unknown cipher” that references an untrusted module in Digest/.
lists.opensuse.org/opensuse-updates/2013-07/msg00039.html
lists.opensuse.org/opensuse-updates/2013-07/msg00043.html
www.openwall.com/lists/oss-security/2013/06/05/16
www.securityfocus.com/bid/60352
www.ubuntu.com/usn/USN-1896-1
bugzilla.redhat.com/show_bug.cgi?id=971096
github.com/audreyt/module-signature/commit/575f7bd6ba4cc7c92f841e8758f88a131674ebf2
github.com/audreyt/module-signature/commit/cbd06b392a73c63159dc5c20ff5b3c8fc88c4896