CVE-2022-29169

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.

• CWE-20
• CWE-1333

• https://github.com/bigbluebutton/bigbluebutton/pull/14886Patch, Third Party Advisory
• https://github.com/bigbluebutton/bigbluebutton/pull/14896Patch, Third Party Advisory
• https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-rwrv-p665-4vwpMitigation, Patch, Third Party Advisory
• https://github.com/bigbluebutton/bigbluebutton/pull/14886Patch, Third Party Advisory
• https://github.com/bigbluebutton/bigbluebutton/pull/14896Patch, Third Party Advisory
• https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-rwrv-p665-4vwpMitigation, Patch, Third Party Advisory

Published

Jun 1, 2022

Last Modified

Jun 17, 2026

Status

Modified

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