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.
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