CVE-2023-34448: Grav Server-side Template Injection (SSTI) via Twig Default Filters
First published: Wed Jun 14 2023(Updated: )
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`.
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Getgrav Grav | <1.7.42 | |
| composer/getgrav/grav | <1.7.42 | 1.7.42 |
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Reference Links
- https://github.com/getgrav/grav/commit/8c2c1cb72611a399f13423fc6d0e1d998c03e5c8
- https://github.com/getgrav/grav/security/advisories/GHSA-whr7-m3f8-mpm8
- https://github.com/twigphp/Twig/blob/v1.44.7/src/Environment.php#L148
- https://huntr.dev/bounties/3ef640e6-9e25-4ecb-8ec1-64311d63fe66/
- https://www.github.com/getgrav/grav/commit/9d6a2dba09fd4e56f5cdfb9a399caea355bfeb83
- https://nvd.nist.gov/vuln/detail/CVE-2023-34448
- https://github.com/getgrav/grav/commit/244758d4383034fe4cd292d41e477177870b65ec
- https://github.com/getgrav/grav/commit/71bbed12f950de8335006d7f91112263d8504f1b
- https://github.com/getgrav/grav/commit/9d01140a63c77075ef09b26ef57cf186138151a5
- https://github.com/advisories/GHSA-whr7-m3f8-mpm8 (Advisory)
Frequently Asked Questions
What is CVE-2023-34448?
CVE-2023-34448 is a server-side template injection vulnerability in Grav prior to version 1.7.42 that can be exploited using the default `filter()` function.
How severe is CVE-2023-34448?
CVE-2023-34448 has a severity rating of 7.2, which is considered high.
What software is affected by CVE-2023-34448?
Grav prior to version 1.7.42 is affected by CVE-2023-34448.
How can CVE-2023-34448 be exploited?
CVE-2023-34448 can be exploited by leveraging the default `filter()` function in Grav to perform server-side template injection.
Is there a patch available for CVE-2023-34448?
Yes, a patch for CVE-2023-34448 is available in version 1.7.42 of Grav.
- collector/nvd-index
- collector/github-advisory-latest
- alias/GHSA-whr7-m3f8-mpm8
- alias/CVE-2023-34448
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- collector/github-advisory
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- vendor/getgrav
- canonical/getgrav grav
- package-manager/composer