BigBlueButton is an open-source virtual classroom. In versions prior to 3.0.19, the recording playback (presentation format) was not sanitizing user's input in public chat. This allowed for a malicious actor to craft and carry out a targeted XSS attack, activated on anyone replaying the recording.
This issue has been fixed 3.0.19.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
High
Complete data modification
Availability
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
References 5
https://github.com/bigbluebutton/bbb-playback/commit/09e89bfe4ff8488b68c3ff040d…
security-advisories@github.com
https://github.com/bigbluebutton/bigbluebutton/commit/69f45aa1b963dc7d80179d015…
security-advisories@github.com
https://github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.19
security-advisories@github.com
https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-8vv7-vj…
security-advisories@github.com
https://github.com/blindsidenetworks/scalelite/releases/tag/v1.7.0
security-advisories@github.com