CVE-2022-29169: ReDoS on endpoint html5client/useragent in BigBlueButton
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 Software
Remediation
Patch Available
Patch Available
Event History
Frequently Asked Questions
What is CVE-2022-29169?
CVE-2022-29169 is a vulnerability in the BigBlueButton web conferencing system that allows for regular expression denial of service (ReDoS) attacks.
How severe is CVE-2022-29169?
CVE-2022-29169 has a severity level of 7.5 (high).
Which versions of BigBlueButton are affected by CVE-2022-29169?
Versions starting with 2.2 and prior to 2.3.19, 2.4.7, and 2.5.0-beta.2 are affected by CVE-2022-29169.
How can an attacker exploit CVE-2022-29169?
By using a specific Regular Expression, an attacker can perform denial of service attacks on the bbb-html5 server in BigBlueButton.
Is there a fix available for CVE-2022-29169?
Yes, the fix for CVE-2022-29169 is available in the BigBlueButton repository. Please refer to the provided GitHub pull requests and security advisories for more information.