cve/2023/CVE-2023-34448.md

### [CVE-2023-34448](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-34448)
![](https://img.shields.io/static/v1?label=Product&message=grav&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=%3D%20%3C%201.7.42%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-1336%3A%20Improper%20Neutralization%20of%20Special%20Elements%20Used%20in%20a%20Template%20Engine&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-20%3A%20Improper%20Input%20Validation&color=brighgreen)

### Description

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`.

### POC

#### Reference
- https://huntr.dev/bounties/3ef640e6-9e25-4ecb-8ec1-64311d63fe66/

#### Github
No PoCs found on GitHub currently.