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

CVE-2020-12443

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