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Security Advisories: GSA_kwCzR0hTQS1tZzR4LXByaDctZzRteM4AA80S

Zend-Captcha Information Disclosure and Insufficient Entropy vulnerability

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.

Permalink: https://github.com/advisories/GHSA-mg4x-prh7-g4mx
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1tZzR4LXByaDctZzRteM4AA80S
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: 6 months ago
Updated: 6 months ago

CVSS Score: 7.5
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Identifiers: GHSA-mg4x-prh7-g4mx
References:

• https://github.com/zendframework/zend-captcha/commit/43c276df6e94e498bf530538aea53876a24fc47c
• https://github.com/zendframework/zend-captcha/commit/5561ef813bb4ad814e835343289dc5077d2eb262
• https://framework.zend.com/security/advisory/ZF2015-09
• https://github.com/FriendsOfPHP/security-advisories/blob/master/zendframework/zend-captcha/ZF2015-09.yaml
• https://github.com/advisories/GHSA-mg4x-prh7-g4mx

Repository: https://github.com/zendframework/zend-captcha
Blast Radius: 25.2

Affected Packages