CVE-2024-28117
published 2024-03-21CVE-2024-28117: Grav is an open-source, flat-file content management system. Prior to version 1.7.45, Grav validates accessible functions through the…
PriorityP261high8.8CVSS 3.1
AVNACLPRLUINSUCHIHAH
EPSS
1.38%
68.7th percentile
Grav is an open-source, flat-file content management system. Prior to version 1.7.45, Grav validates accessible functions through the Utils::isDangerousFunction function, but does not impose restrictions on twig functions like twig_array_map, allowing attackers to bypass the validation and execute arbitrary commands. Twig processing of static pages can be enabled in the front matter by any administrative user allowed to create or edit pages. As the Twig processor runs unsandboxed, this behavior can be used to gain arbitrary code execution and elevate privileges on the instance. Upgrading to patched version 1.7.45 can mitigate this issue.
Affected
2 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| getgrav | grav | < 1.7.45 | 1.7.45 |
| getgrav | grav | >= 0 < 1.7.45 | 1.7.45 |
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GHSA
Server Side Template Injection (SSTI)
ghsa·2024-03-22
CVE-2024-28117 [HIGH] CWE-94 Server Side Template Injection (SSTI)
Server Side Template Injection (SSTI)
### Summary
Grav validates accessible functions through the Utils::isDangerousFunction function, but does not impose restrictions on twig functions like twig_array_map, allowing attackers to bypass the validation and execute arbitrary commands.
### Details
```
{{ grav.twig.twig.getFunction('twig_array_map')|var_dump }}
```
When we accessed twig_array_map like this, we confirmed that the twigFunction object is properly returned. Since the callable property is correctly included, we can access twig_array_map without any restrictions.
```
{% set cmd = {'id':'system'} %}
{{ twig_array_map(grav.twig.twig,cmd,'call_user_func')|join }}
```
Since there is no validation on twig_array_map itself, it is possible to call arbitrary function using call_user_fun
OSV
Server Side Template Injection (SSTI)
osv·2024-03-22
CVE-2024-28117 [HIGH] Server Side Template Injection (SSTI)
Server Side Template Injection (SSTI)
### Summary
Grav validates accessible functions through the Utils::isDangerousFunction function, but does not impose restrictions on twig functions like twig_array_map, allowing attackers to bypass the validation and execute arbitrary commands.
### Details
```
{{ grav.twig.twig.getFunction('twig_array_map')|var_dump }}
```
When we accessed twig_array_map like this, we confirmed that the twigFunction object is properly returned. Since the callable property is correctly included, we can access twig_array_map without any restrictions.
```
{% set cmd = {'id':'system'} %}
{{ twig_array_map(grav.twig.twig,cmd,'call_user_func')|join }}
```
Since there is no validation on twig_array_map itself, it is possible to call arbitrary function using call_user_fun
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
https://github.com/getgrav/grav/commit/de1ccfa12dbcbf526104d68c1a6bc202a98698fehttps://github.com/getgrav/grav/security/advisories/GHSA-qfv4-q44r-g7rvhttps://github.com/getgrav/grav/commit/de1ccfa12dbcbf526104d68c1a6bc202a98698fehttps://github.com/getgrav/grav/security/advisories/GHSA-qfv4-q44r-g7rv
2024-03-21
Published