CVE-2007-2727 Information
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The mcrypt_create_iv function in ext/mcrypt/mcrypt.c in PHP before 4.4.7 5.2.1 and possibly 5.0.x and other PHP 5 versions calls php_rand_r with an uninitialized seed variable and therefore always generates the same initialization vector (IV) which might allow context-dependent attackers to decrypt certain data more easily because of the guessable encryption keys.
Reference
http://blog.php-security.org/archives/80-Watching-the-PHP-CVS.html http://bugs.php.net/bug.php?id=40999 http://cvs.php.net/viewvc.cgi/php-src/ext/mcrypt/mcrypt.c?r1=1.91.2.3.2.9&r2=1.91.2.3.2.10 http://osvdb.org/36087 http://secunia.com/advisories/26895 http://www.fortheloot.com/public/mcrypt.patch http://www.mandriva.com/security/advisories?name=MDKSA-2007:187 http://www.novell.com/linux/security/advisories/2007_15_sr.html http://www.php.net/ChangeLog-5.php http://www.securityfocus.com/bid/23984