ZendFramework 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.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | zendframework/zendframework | >= 2.0.0, < 2.4.9 | 2.4.9 |
References
- https://github.com/zendframework/zendframework/commit/ced8ff93ef892a64885c03f5dfab3f788a219709
- https://framework.zend.com/security/advisory/ZF2015-09
- https://github.com/FriendsOfPHP/security-advisories/blob/master/zendframework/zendframework/ZF2015-09.yaml
- https://github.com/zendframework/zendframework
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N- Weakness (CWE)
CWE-200, CWE-331- Platform
- Composer
- Package
zendframework/zendframework- Disclosed
- 07.06.2024
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-2fhr-8r8r-qp56 - CC BY 4.0
Vulnerability history: zendframework/zendframework
All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 23
- First → latest
- 06.2021 06.2024
- Without a fix
- 1
- Exploited in attacks
- 0
Severity breakdown
- Critical 6
- High 7
- Medium 10
Disclosures per year
- 2021: 1
- 2022: 9
- 2023: 0
- 2024: 13
- 2025: 0
- 2026: 0
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ZendFramework Information Disclosure and Insufficient Entropy vulnerability this entry
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