Gentoo Linux Security Advisory GLSA 200708-08 - The functions deletekey(), gpg_check_sign_pgp_mime() and gpg_recv_key() used in the SquirrelMail G/PGP encryption plugin do not properly escape user-supplied data. Versions less than 1.4.10a-r2 are affected.
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iDefense Security Advisory 07.11.07 - Remote exploitation of a local file inclusion vulnerability in gpg_help.php in version 2.0 of the SquirrelMail G/PGP Plugin could allow an authenticated webmail user to execute arbitrary PHP code under the security context of the running web server. iDefense has confirmed the existence of this vulnerability in version 2.0 of the G/PGP Encryption Plugin for SquirrelMail. It is suspected that earlier versions of the plug-in are also affected.
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