Multiple directory traversal vulnerabilities in the G/PGP (GPG) Plugin 2.0, and 2.1dev before 20070614, for Squirrelmail allow remote authenticated users to include and execute arbitrary local files via a .. (dot dot) in the help parameter to (1) gpghelp.php or (2) gpghelpbase.php.
The G/PGP (GPG) Plugin 2.0, and 2.1dev before 20060912, for Squirrelmail allows remote attackers to execute arbitrary commands via shell metacharacters in the messageSignedText parameter to the gpgchecksignpgpmime function in gpghookfunctions.php. NOTE: a parameter value can be set in the contents of an e-mail message.