CVEs-PoC/2020/CVE-2020-12443.md

### [CVE-2020-12443](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12443)
![](https://img.shields.io/static/v1?label=Product&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=brighgreen)

### Description

BigBlueButton before 2.2.6 allows remote attackers to read arbitrary files because the presfilename (lowercase) value can be a .pdf filename while the presFilename (mixed case) value has a ../ sequence. This can be leveraged for privilege escalation via a directory traversal to bigbluebutton.properties. NOTE: this issue exists because of an ineffective mitigation to CVE-2020-12112 in which there was an attempted fix within an NGINX configuration file, without considering that the relevant part of NGINX is case-insensitive.

### POC

#### Reference
- https://github.com/mclab-hbrs/BBB-POC

#### Github
- https://github.com/mclab-hbrs/BBB-POC