BigBlueButton is an open-source virtual classroom. Prior to 3.0.29, BigBlueButton failed to escape meetingName in record-and-playback/screenshare/playback/index.html.erb when generating the screenshare playback format. A low-privileged user could store a crafted meeting name that embedded script content, and the script executed in another user's browser when that user replayed the recording.
This issue is fixed in version 3.0.29.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
Required
User action required
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
Low
Partial data modification
Availability
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
References 3
https://github.com/bigbluebutton/bigbluebutton/commit/a53f2b92022388bfa4109d313…
security-advisories@github.com
https://github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.29
security-advisories@github.com
https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-57p5-c8…
security-advisories@github.com