{"id":"GHSA-mg4x-prh7-g4mx","aliases":[],"url":"https://o3.security/vulnerability/GHSA-mg4x-prh7-g4mx","summary":"Zend-Captcha Information Disclosure and Insufficient Entropy vulnerability","details":"In Zend Framework, `Zend_Captcha_Word` (v1) and `Zend\\Captcha\\Word` (v2) generate a \"word\" for a CAPTCHA challenge by selecting a sequence of random letters from a character set. Prior to this advisory, the selection was performed using PHP's 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.","published":"2024-06-07T22:25:12Z","modified":"2024-12-04T05:36:22.994493Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"zendframework/zend-captcha","fixedVersion":"2.4.9"},{"ecosystem":"Packagist","name":"zendframework/zend-captcha","fixedVersion":"2.5.2"}],"fix":{"url":"https://github.com/zendframework/zend-captcha/commit/43c276df6e94e498bf530538aea53876a24fc47c","label":"zendframework/zend-captcha@43c276d"},"references":[{"type":"WEB","url":"https://github.com/zendframework/zend-captcha/commit/43c276df6e94e498bf530538aea53876a24fc47c"},{"type":"WEB","url":"https://github.com/zendframework/zend-captcha/commit/5561ef813bb4ad814e835343289dc5077d2eb262"},{"type":"WEB","url":"https://framework.zend.com/security/advisory/ZF2015-09"},{"type":"WEB","url":"https://github.com/FriendsOfPHP/security-advisories/blob/master/zendframework/zend-captcha/ZF2015-09.yaml"},{"type":"PACKAGE","url":"https://github.com/zendframework/zend-captcha"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2024-12-04T05:36:22.994493Z"}}