Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| bigbluebutton / bigbluebutton | affected >= 2.2, < 2.3.19; affected >= 2.4.0, < 2.4.7; affected >= 2.5-alpha-1, < 2.5.0-beta.2 |
CWE
CWE-20
References
- https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-rwrv-p665-4vwp
- https://github.com/bigbluebutton/bigbluebutton/pull/14886
- https://github.com/bigbluebutton/bigbluebutton/pull/14896
ADP enrichment
No English description supplied.
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No references supplied.