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CVE-2022-29169— ReDoS on endpoint html5client/useragent in BigBlueButton

Quick assessment

Affected
bigbluebutton bigbluebutton
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

BigBlueButton是BigBlueButton社区的一套开源的Web会议系统。 BigBlueButton 2.2 到 2.3.19、2.4.7 和 2.5.0-beta.2 之前版本存在输入验证错误漏洞，该漏洞源于容易受到正则表达式拒绝服务 (ReDoS) 攻击。攻击者利用该漏洞可以通过使用特定的正则表达式对 bbb-html5 服务造成拒绝服务。

CVSS 7.5 · High EPSS 1.56% · P74

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2022-29169

Vulnerability Information
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Vulnerability Title
ReDoS on endpoint html5client/useragent in BigBlueButton
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
BigBlueButton 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
BigBlueButton是BigBlueButton社区的一套开源的Web会议系统。 BigBlueButton 2.2 到 2.3.19、2.4.7 和 2.5.0-beta.2 之前版本存在输入验证错误漏洞，该漏洞源于容易受到正则表达式拒绝服务 (ReDoS) 攻击。攻击者利用该漏洞可以通过使用特定的正则表达式对 bbb-html5 服务造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
bigbluebutton bigbluebutton >= 2.2, < 2.3.19 -

II. Public POCs for CVE-2022-29169

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III. Intelligence Information for CVE-2022-29169

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Patches & Fixes for CVE-2022-29169 (2)

Vendor Advisories for CVE-2022-29169 (1)

Same Patch Batch · bigbluebutton · 2022-06-01 · 6 CVEs total

CVE-2022-29232 6.5 MEDIUM Exposure of messages in BigBlueButton public chats
CVE-2022-29235 5.3 MEDIUM Limited data exposure for shared external videos in BigBlueButton
CVE-2022-29233 4.3 MEDIUM Improper access control for breakout rooms in BigBlue Button
CVE-2022-29234 4.3 MEDIUM Grace period for lock settings in public/private chats in BigBlueButton
CVE-2022-29236 4.3 MEDIUM Improper access control for pencil annotations in BigBlueButton

IV. Related Vulnerabilities

Same product: bigbluebutton
Same vendor: bigbluebutton
Same weakness: CWE-20

V. Comments for CVE-2022-29169

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