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CVE-2022-29236— Improper access control for pencil annotations 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版本到2.3.18和2.4-rc-6版本存在授权问题漏洞，该漏洞源于应用缺少必要的权限检查。攻击者可以利用该漏洞绕过访问限制以在白板上绘图。

CVSS 4.3 · Medium EPSS 0.87% · P57

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2022-29236

Vulnerability Information
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Vulnerability Title
Improper access control for pencil annotations in BigBlueButton
Source: CVE Program / CVE List V5
Vulnerability Description
BigBlueButton is an open source web conferencing system. Starting in version 2.2 and prior to versions 2.3.18 and 2.4-rc-6, an attacker can circumvent access restrictions for drawing on the whiteboard. The permission check is inadvertently skipped on the server, due to a previously introduced grace period. The attacker must be a meeting participant. The problem has been patched in versions 2.3.18 and 2.4-rc-6. There are currently no known workarounds.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
BigBlueButton 授权问题漏洞
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版本到2.3.18和2.4-rc-6版本存在授权问题漏洞，该漏洞源于应用缺少必要的权限检查。攻击者可以利用该漏洞绕过访问限制以在白板上绘图。
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, < 2.3.18 -

II. Public POCs for CVE-2022-29236

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III. Intelligence Information for CVE-2022-29236

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Patches & Fixes for CVE-2022-29236 (2)

Vendor Advisories for CVE-2022-29236 (1)

Other References for CVE-2022-29236 (2)

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

CVE-2022-29169 7.5 HIGH ReDoS on endpoint html5client/useragent in BigBlueButton
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

IV. Related Vulnerabilities

Same product: bigbluebutton
Same vendor: bigbluebutton
Same weakness: CWE-285

V. Comments for CVE-2022-29236

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