In Zend Framework, Zend_Captcha_Word
(v1) and Zend\Captcha\Word
(v2) generate a βwordβ for a CAPTCHA challenge by selecting a sequence of random letters from a character set. Prior to this advisory, the selection was performed using PHPβs internal array_rand()
function. This function does not generate sufficient entropy due to its usage of rand() instead of more cryptographically secure methods such as openssl_pseudo_random_bytes()
. This could potentially lead to information disclosure should an attacker be able to brute force the random number generation.
CPE | Name | Operator | Version |
---|---|---|---|
zendframework/zend-captcha | lt | 2.5.2 | |
zendframework/zend-captcha | lt | 2.4.9 |
framework.zend.com/security/advisory/ZF2015-09
github.com/advisories/GHSA-mg4x-prh7-g4mx
github.com/FriendsOfPHP/security-advisories/blob/master/zendframework/zend-captcha/ZF2015-09.yaml
github.com/zendframework/zend-captcha/commit/43c276df6e94e498bf530538aea53876a24fc47c
github.com/zendframework/zend-captcha/commit/5561ef813bb4ad814e835343289dc5077d2eb262