Grav is a flat-file content management system. Prior to version 1.7.42, there is a logic flaw in the `GravExtension.filterFilter()` function whereby validation against a denylist of unsafe functions is only performed when the argument passed to filter is a string. However, passing an array as a callable argument allows the validation check to be skipped. Consequently, a low privileged attacker with login access to Grav Admin panel and page creation/update permissions is able to inject malicious templates to obtain remote code execution. The vulnerability can be found in the `GravExtension.filterFilter()` function declared in `/system/src/Grav/Common/Twig/Extension/GravExtension.php`. Version 1.7.42 contains a patch for this issue. End users should also ensure that `twig.undefined_functions` and `twig.undefined_filters` properties in `/path/to/webroot/system/config/system.yaml` configuration file are set to `false` to disallow Twig from treating undefined filters/functions as PHP functions and executing them.
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History
Wed, 18 Dec 2024 19:15:00 +0000
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2024-12-18T19:03:09.288Z
Reserved: 2023-05-31T13:51:51.174Z
Link: CVE-2023-34252
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Updated: 2024-08-02T16:01:54.351Z
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Status : Modified
Published: 2023-06-14T22:15:09.397
Modified: 2024-11-21T08:06:51.900
Link: CVE-2023-34252
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