Vulnerability CVE-2022-29236
Published: 2022-06-02

Description:
BigBlueButton is an open source web conferencing system. Starting in version 2.2 and up to versions 2.3.18 and 2.4-rc-6, an attacker can circumvent access restrictions for drawing on the whiteboard. The permission check is inadvertently skipped on the server, due to a previously introduced grace period. The attacker must be a meeting participant. The problem has been patched in versions 2.3.18 and 2.4-rc-6. There are currently no known workarounds.

Type:

CWE-285

 (Improper Authorization)

CVSS2 => (AV:N/AC:L/Au:S/C:P/I:N/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4/10
2.9/10
8/10
Exploit range
Attack complexity
Authentication
Remote
Low
Single time
Confidentiality impact
Integrity impact
Availability impact
Partial
None
None
Affected software
Bigbluebutton -> Bigbluebutton 

 References:
https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-p93g-r9gm-9v6r
https://github.com/bigbluebutton/bigbluebutton/releases/tag/v2.4-rc-6
https://github.com/bigbluebutton/bigbluebutton/pull/14265
https://github.com/bigbluebutton/bigbluebutton/releases/tag/v2.3.18
https://github.com/bigbluebutton/bigbluebutton/pull/13803
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