CVE-2022-29169: ReDoS on endpoint html5client/useragent in BigBlueButton
First published: Wed Jun 01 2022(Updated: )
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.
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Bigbluebutton Bigbluebutton | >=2.2.0<2.3.19 | |
| Bigbluebutton Bigbluebutton | >=2.4.0<2.4.7 | |
| Bigbluebutton Bigbluebutton | =2.5-alpha1 | |
| Bigbluebutton Bigbluebutton | =2.5-alpha2 | |
| Bigbluebutton Bigbluebutton | =2.5-alpha3 | |
| Bigbluebutton Bigbluebutton | =2.5-alpha4 | |
| Bigbluebutton Bigbluebutton | =2.5-alpha5 | |
| Bigbluebutton Bigbluebutton | =2.5-alpha6 | |
| Bigbluebutton Bigbluebutton | =2.5-beta1 |
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Reference Links
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.
- collector/nvd-api
- collector/nvd-index
- agent/author
- agent/type
- agent/softwarecombine
- collector/mitre-cve
- source/MITRE
- agent/title
- agent/references
- agent/remedy
- agent/last-modified-date
- agent/weakness
- agent/severity
- agent/tags
- agent/description
- agent/first-publish-date
- agent/event
- vendor/bigbluebutton
- canonical/bigbluebutton bigbluebutton
- version/bigbluebutton bigbluebutton/2.2.0
- version/bigbluebutton bigbluebutton/2.4.0
- version/bigbluebutton bigbluebutton/2.5-alpha1
- version/bigbluebutton bigbluebutton/2.5-alpha2
- version/bigbluebutton bigbluebutton/2.5-alpha3
- version/bigbluebutton bigbluebutton/2.5-alpha4
- version/bigbluebutton bigbluebutton/2.5-alpha5
- version/bigbluebutton bigbluebutton/2.5-alpha6
- version/bigbluebutton bigbluebutton/2.5-beta1