Multiple unspecified vulnerabilities in the G/PGP (GPG) Plugin 2.1 for Squirrelmail allow remote attackers to execute arbitrary commands via unspecified vectors. NOTE: this information is based upon a vague pre-advisory from a reliable researcher.
http://www.securityfocus.com/bid/24828
http://www.attrition.org/pipermail/vim/2007-July/001703.html
http://lists.immunitysec.com/pipermail/dailydave/2007-July/004453.html