Untrusted search path vulnerability in Module::Signature before 0.75 allows local users to gain privileges via a Trojan horse module under the current working directory, as demonstrated by a Trojan horse Text::Diff module.
https://metacpan.org/changes/distribution/Module-Signature
https://github.com/audreyt/module-signature/commit/c41e8885b862b9fce2719449bc9336f0bea658ef
http://www.securityfocus.com/bid/73937
http://www.openwall.com/lists/oss-security/2015/04/23/17
http://www.openwall.com/lists/oss-security/2015/04/07/1