Auth bypass in Bigbluebutton
CVE-2022-29236
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.009 (57.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: +0.000
Affected products
- Bigbluebutton — versions >= 2.4-alpha-1, < 2.4-rc-6, >= 2.2, < 2.3.18, 2.4
Weakness classification (CWE)
References
- github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-p93g-r9gm-9v6r (Patch, Third Party Advisory)
- github.com/bigbluebutton/bigbluebutton/pull/13803 (Patch, Third Party Advisory)
- github.com/bigbluebutton/bigbluebutton/pull/14265 (Patch, Third Party Advisory)
- github.com/bigbluebutton/bigbluebutton/releases/tag/v2.3.18 (Third Party Advisory, Release Notes)
- github.com/bigbluebutton/bigbluebutton/releases/tag/v2.4-rc-6 (Third Party Advisory, Release Notes)
Frequently asked questions
- What is CVE-2022-29236?
- CVE-2022-29236 is a medium-severity vulnerability in Bigbluebutton, classified under Improper Authorization. CVSS score: 4.3/10. Published 2022-06-02.
- How severe is CVE-2022-29236?
- Medium severity. CVSS v3 base score is 4.3 out of 10.