Vulnerability Description
BigBlueButton is an open source web conferencing system. Versions starting with 2.2 and prior to 2.3.19, 2.4.7, and 2.5.0-beta.2 are vulnerable to regular expression denial of service (ReDoS) attacks. By using specific a RegularExpression, an attacker can cause denial of service for the bbb-html5 service. The useragent library performs checking of device by parsing the input of User-Agent header and lets it go through lookupUserAgent() (alias of useragent.lookup() ). This function handles input by regexing and attackers can abuse that by providing some ReDos payload using `SmartWatch`. The maintainers removed `htmlclient/useragent` from versions 2.3.19, 2.4.7, and 2.5.0-beta.2. As a workaround, disable NginX forwarding the requests to the handler according to the directions in the GitHub Security Advisory.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Bigbluebutton | Bigbluebutton | >= 2.2.0, < 2.3.19 |
Related Weaknesses (CWE)
References
- https://github.com/bigbluebutton/bigbluebutton/pull/14886PatchThird Party Advisory
- https://github.com/bigbluebutton/bigbluebutton/pull/14896PatchThird Party Advisory
- https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-rwrv-p66MitigationPatchThird Party Advisory
- https://github.com/bigbluebutton/bigbluebutton/pull/14886PatchThird Party Advisory
- https://github.com/bigbluebutton/bigbluebutton/pull/14896PatchThird Party Advisory
- https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-rwrv-p66MitigationPatchThird Party Advisory
FAQ
What is CVE-2022-29169?
CVE-2022-29169 is a vulnerability with a CVSS score of 7.5 (HIGH). BigBlueButton is an open source web conferencing system. Versions starting with 2.2 and prior to 2.3.19, 2.4.7, and 2.5.0-beta.2 are vulnerable to regular expression denial of service (ReDoS) attacks....
How severe is CVE-2022-29169?
CVE-2022-29169 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2022-29169?
Check the references section above for vendor advisories and patch information. Affected products include: Bigbluebutton Bigbluebutton.