CVE-2023-34448
Grav Server-side Template Injection (SSTI) via Twig Default Filters
HIGH 7.2EPSS 4.5%
Grav is a flat-file content management system. Prior to version 1.7.42, the patch for CVE-2022-2073, a server-side template injection vulnerability in Grav leveraging the default `filter()` function, did not block other built-in functions exposed by Twig's Core Extension that could be used to invoke arbitrary unsafe functions, thereby allowing for remote code execution. A patch in version 1.74.2 overrides the built-in Twig `map()` and `reduce()` filter functions in `system/src/Grav/Common/Twig/Extension/GravExtension.php` to validate the argument passed to the filter in `$arrow`.
- Affected
- getgrav · grav
- CVSS v3.1 NVD
- 7.2 HIGH
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - CVSS v3.1 GITHUB
- 8.8 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS
- 4.52% chance of exploitation in the next 30 days, 91st percentile
- Published
- 2023-06-14
- Updated
- 2024-12-18
Proof-of-concept exploits (2)
Security advisories
- https://www.github.com/getgrav/grav/commit/9d6a2dba09fd4e56f5cdfb9a399caea355bfeb83
- getgrav/grav/security/advisories/GHSA-whr7-m3f8-mpm8
- twigphp/Twig/blob/v1.44.7/src/Environment.php#L148
- https://huntr.dev/bounties/3ef640e6-9e25-4ecb-8ec1-64311d63fe66