CVE-2022-29236 Improper access control for pencil annotations in BigBlueButton
An attacker who is a meeting participant can bypass permission checks to draw on the whiteboard, modifying shared content without authorization.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2022-29236?
CVE-2022-29236 is a medium-severity missing authorization vulnerability in bigbluebutton, published on 1 Jun 2022. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
BigBlueButton is an open source web conferencing system. Starting in version 2.2 and prior 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.
Weakness: CWE-285
Which versions are affected by CVE-2022-29236?
It affects 1 product.
Products include Bigbluebutton Bigbluebutton.
How do I fix CVE-2022-29236?
No fix has been published for CVE-2022-29236 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2022-29236 being exploited?
There is no known exploitation of CVE-2022-29236 in the wild and no public exploit code.
Other vulnerabilities in bigbluebutton
Sources
Also known as GHSA-p93g-r9gm-9v6r.