CVE-2020-12443
Critical
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.
SeverityCritical
CVSS9.8
Exploit probability—
ProductBigbluebutton
PublishedApr 29, 2020
First seenApr 29, 2020
How to fix
Update
- bigbluebutton bigbluebutton2.2.6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| bigbluebutton bigbluebutton | v < 2.2.6 | 2.2.6 |
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