Twig CVE-2024-51755: Unguarded calls to __isset() and to array-accesses in a sandbox
November 6, 2024
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Published by
Fabien Potencier
Affected versions
Twig versions <3.11.2; >=3.12,<3.14.1 are affected by this security issue.
The issue has been fixed in Twig 3.11.2 and 3.14.1. Note that Twig versions 1 and 2 are not maintained anymore and are vulnerable.
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 for branch 3.11.x.
Credits
We would like to thank Jamie Schouten for reporting the issue and Nicolas Grekas for providing the fix.
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