Attacker can trick BigBlueButton into generating a signed join link with additional parameters, allowing them to join a meeting as moderator
CVE-2024-38518

4.6MEDIUM

Key Information:

Vendor

Bigbluebutton

Status
Bigbluebutton
Vendor
CVE Published:
28 June 2024

What is CVE-2024-38518?

BigBlueButton is an open-source virtual classroom designed to help teachers teach and learners learn. An attacker with a valid join link to a meeting can trick BigBlueButton into generating a signed join link with additional parameters. One of those parameters may be "role=moderator", allowing an attacker to join a meeting as moderator using a join link that was originally created for viewer access. This vulnerability has been patched in version(s) 2.6.18, 2.7.8 and 3.0.0-alpha.7.

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Affected Version(s)

bigbluebutton < 2.6.18 < 2.6.18

bigbluebutton >= 2.7.0, < 2.7.8 < 2.7.0, 2.7.8

bigbluebutton >= 2.8.0, < 3.0.0-alpha.7 < 2.8.0, 3.0.0-alpha.7

References

https://github.com/bigbluebutton/bigbluebutton/security/a...
x_refsource_CONFIRM
https://github.com/bigbluebutton/bigbluebutton/pull/20279
x_refsource_MISC
https://github.com/bigbluebutton/bigbluebutton/commit/a9d...
x_refsource_MISC

CVSS V3.1

Score:
4.6
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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