cve/2021/CVE-2021-39172.md

### [CVE-2021-39172](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-39172)
![](https://img.shields.io/static/v1?label=Product&message=Cachet&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-93%3A%20Improper%20Neutralization%20of%20CRLF%20Sequences%20('CRLF%20Injection')&color=brighgreen)

### Description

Cachet is an open source status page system. Prior to version 2.5.1, authenticated users, regardless of their privileges (User or Admin), can exploit a new line injection in the configuration edition feature (e.g. mail settings) and gain arbitrary code execution on the server. This issue was addressed in version 2.5.1 by improving `UpdateConfigCommandHandler` and preventing the use of new lines characters in new configuration values. As a workaround, only allow trusted source IP addresses to access to the administration dashboard.

### POC

#### Reference
- https://blog.sonarsource.com/cachet-code-execution-via-laravel-configuration-injection/

#### Github
- https://github.com/ARPSyndicate/cvemon
- https://github.com/NaInSec/CVE-PoC-in-GitHub
- https://github.com/SYRTI/POC_to_review
- https://github.com/W1ngLess/CVE-2021-39172-RCE
- https://github.com/WhooAmii/POC_to_review
- https://github.com/nomi-sec/PoC-in-GitHub
- https://github.com/trhacknon/Pocingit
- https://github.com/zecool/cve