CVE-2024-51755: Unguarded calls to __isset() and to array-accesses when the sandbox is enabled in Twig
First published: Wed Nov 06 2024(Updated: )
### Description In a sandbox, and attacker can access attributes of Array-like objects as they were not checked by the security policy. They are now checked via the property policy and the `__isset()` method is now called after the security check. **This is a BC break.** ### Resolution The sandbox mode now ensures access to array-like's properties is allowed. The patch for this issue is available [here](https://github.com/twigphp/twig/commit/249615d3bfc3ce1672815a265458c0bcf8f7cc61) for branch 3.11.x. ### Credits We would like to thank Jamie Schouten for reporting the issue and Nicolas Grekas for providing the fix.
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| composer/twig/twig | >=3.12.0<3.14.1 | 3.14.1 |
| composer/twig/twig | >=1.0.0<3.11.2 | 3.11.2 |
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Reference Links
- https://github.com/twigphp/Twig/security/advisories/GHSA-jjxq-ff2g-95vh
- https://github.com/twigphp/Twig/commit/831c148e786178e5f2fde9db67266be3bf241c21
- https://nvd.nist.gov/vuln/detail/CVE-2024-51755
- https://github.com/FriendsOfPHP/security-advisories/blob/master/twig/twig/CVE-2024-51755.yaml
- https://symfony.com/blog/unguarded-calls-to-__isset-and-to-array-accesses-when-the-sandbox-is-enabled
- https://github.com/advisories/GHSA-jjxq-ff2g-95vh (Advisory)
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