CVE-2022-29169

Dashboard / Vulnerabilities / CVE-2022-29169

CVE-2022-29169

Summary: ReDoS on endpoint html5client/useragent in BigBlueButton

Details: 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.

References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/29xxx/CVE-2022-29169.json, https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-rwrv-p665-4vwp, https://nvd.nist.gov/vuln/detail/CVE-2022-29169, https://github.com/bigbluebutton/bigbluebutton/pull/14886, https://github.com/bigbluebutton/bigbluebutton/pull/14896