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CVE-2022-41961— BigBlueButton subject to Ineffective user bans

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 2.4-rc-6 之前版本存在访问控制错误漏洞，该漏洞源于受到无效用户禁令的约束，攻击者利用该漏洞可以注册多个用户，并与其中之一一起加入会议。

CVSS 4.3 · Medium EPSS 0.29% · P20

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts
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I. Basic Information for CVE-2022-41961

Vulnerability Information
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Vulnerability Title
BigBlueButton subject to Ineffective user bans
Source: CVE Program / CVE List V5
Vulnerability Description
BigBlueButton is an open source web conferencing system. Versions prior to 2.4-rc-6 are subject to Ineffective user bans. The attacker could register multiple users, and join the meeting with one of them. When that user is banned, they could still join the meeting with the remaining registered users from the same extId. This issue has been fixed by improving permissions such that banning a user removes all users related to their extId, including registered users that have not joined the meeting. This issue is patched in versions 2.4-rc-6 and 2.5-alpha-1. There are no workarounds.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
源验证错误
Source: CVE Program / CVE List V5
Vulnerability Title
BigBlueButton 访问控制错误漏洞
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 2.4-rc-6 之前版本存在访问控制错误漏洞，该漏洞源于受到无效用户禁令的约束，攻击者利用该漏洞可以注册多个用户，并与其中之一一起加入会议。
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 < v2.4-rc-6 -

II. Public POCs for CVE-2022-41961

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III. Intelligence Information for CVE-2022-41961

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Vendor Advisories for CVE-2022-41961 (1)

Other References for CVE-2022-41961 (2)

Same Patch Batch · bigbluebutton · 2022-12-16 · 5 CVEs total

CVE-2022-41964 5.7 MEDIUM BigBlueButton contains Response leaks in anonymous polls
CVE-2022-23490 4.3 MEDIUM Improper access control to polling votes
CVE-2022-41962 2.7 LOW BigBlueButton contains Incorrect Authorization for setting emoji status
CVE-2022-41963 2.7 LOW BigBlueButton contains Improper Preservation of Permissions for whiteboard

IV. Related Vulnerabilities

Same product: bigbluebutton
Same vendor: bigbluebutton
Same weakness: CWE-346

V. Comments for CVE-2022-41961

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