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.
The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Bigbluebutton | Bigbluebutton | 2.2.0 (including) | 2.3.19 (excluding) |
| Bigbluebutton | Bigbluebutton | 2.4.0 (including) | 2.4.7 (excluding) |
| Bigbluebutton | Bigbluebutton | 2.5-alpha1 (including) | 2.5-alpha1 (including) |
| Bigbluebutton | Bigbluebutton | 2.5-alpha2 (including) | 2.5-alpha2 (including) |
| Bigbluebutton | Bigbluebutton | 2.5-alpha3 (including) | 2.5-alpha3 (including) |
| Bigbluebutton | Bigbluebutton | 2.5-alpha4 (including) | 2.5-alpha4 (including) |
| Bigbluebutton | Bigbluebutton | 2.5-alpha5 (including) | 2.5-alpha5 (including) |
| Bigbluebutton | Bigbluebutton | 2.5-alpha6 (including) | 2.5-alpha6 (including) |
| Bigbluebutton | Bigbluebutton | 2.5-beta1 (including) | 2.5-beta1 (including) |
Attackers can create crafted inputs that
intentionally cause the regular expression to use
excessive backtracking in a way that causes the CPU
consumption to spike.