CVE-2023-34252 (GCVE-0-2023-34252)
Vulnerability from cvelistv5
Published
2023-06-14 21:38
Modified
2024-12-18 19:03
Severity ?
8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-184 - Incomplete List of Disallowed Inputs
  • CWE-1336 - Improper Neutralization of Special Elements Used in a Template Engine
Summary
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.
References
Impacted products
Vendor Product Version
getgrav grav Version: < 1.7.42
 Create a notification for this product.
Show details on NVD website

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