CVE-2024-51754: Unguarded calls to __toString() when nesting an object into an array in Twig
First published: Wed Nov 06 2024(Updated: )
### Description In a sandbox, an attacker can call `__toString()` on an object even if the `__toString()` method is not allowed by the security policy when the object is part of an array or an argument list (arguments to a function or a filter for instance). ### Resolution The sandbox mode now checks the `__toString()` method call on all objects. The patch for this issue is available [here](https://github.com/twigphp/Twig/commit/cafc608ece310e62a35a76f17e25c04ab9ed05cc) for the 3.11.x branch, and [here](https://github.com/twigphp/Twig/commit/d4a302681bca9f7c6ce2835470d53609cdf3e23e) for the 3.x branch. ### Credits We would like to thank Jamie Schouten for reporting the issue and Fabien Potencier 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<3.14.1 | 3.14.1 |
| composer/twig/twig | <3.11.2 | 3.11.2 |
| debian/php-twig | <=2.14.3-1+deb11u2<=2.14.3-1+deb11u3<=3.5.1-1+deb12u1 | 3.20.0-2 |
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Reference Links
- https://github.com/twigphp/Twig/commit/2bb8c2460a2c519c498df9b643d5277117155a73
- https://github.com/twigphp/Twig/security/advisories/GHSA-6377-hfv9-hqf6
- https://nvd.nist.gov/vuln/detail/CVE-2024-51754
- https://github.com/FriendsOfPHP/security-advisories/blob/master/twig/twig/CVE-2024-51754.yaml
- https://symfony.com/blog/unguarded-calls-to-__tostring-when-nesting-an-object-into-an-array
- https://github.com/advisories/GHSA-6377-hfv9-hqf6 (Advisory)
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-51754
- https://launchpad.net/bugs/cve/CVE-2024-51754
- https://security-tracker.debian.org/tracker/CVE-2024-51754
- https://ubuntu.com/security/CVE-2024-51754
Frequently Asked Questions
What is the severity of CVE-2024-51754?
The severity of CVE-2024-51754 is classified as medium, indicating potential risk to affected applications.
How do I fix CVE-2024-51754?
To fix CVE-2024-51754, update the twig/twig package to version 3.14.1 or 3.11.2 as per the resolution guidelines.
Which versions of twig/twig are affected by CVE-2024-51754?
CVE-2024-51754 affects twig/twig versions between 3.12.0 and 3.14.1, as well as all versions below 3.11.2.
Can CVE-2024-51754 be exploited in a sandbox environment?
Yes, CVE-2024-51754 can be exploited in a sandbox environment where an attacker can call the __toString() method on an object.
What is the nature of the vulnerability in CVE-2024-51754?
CVE-2024-51754 is a vulnerability that allows an attacker to bypass security policies related to the __toString() method in specific contexts.
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