Twig security release: disallow non closures in the sort filter
Affected versions
Twig >2.0.0,<2.14.11 || >3.0.0,<3.3.8 are affected by this security issue. Twig 1.x is not affected as the „sort“ filter does not allow an arrow function in that version.
The issue has been fixed in Twig 2.14.11 and 3.3.8.
Description
When in a sandbox mode, the arrow parameter of the sort filter must be a closure to avoid attackers being able to run arbitrary PHP functions.
Resolution
We now disallow calling non Closure in the sort filter like we already did for some other filters.
Credits
We would like to thank Marlon Starkloff for reporting the issue and Fabien Potencier for fixing the issue.
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