CVE-2022-29236

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.

Weakness

The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action.

Affected Software

Name	Vendor	Start Version	End Version
Bigbluebutton	Bigbluebutton	2.2.0 (including)	2.3.18 (excluding)
Bigbluebutton	Bigbluebutton	2.4-alpha1 (including)	2.4-alpha1 (including)
Bigbluebutton	Bigbluebutton	2.4-alpha2 (including)	2.4-alpha2 (including)
Bigbluebutton	Bigbluebutton	2.4-beta1 (including)	2.4-beta1 (including)
Bigbluebutton	Bigbluebutton	2.4-beta2 (including)	2.4-beta2 (including)
Bigbluebutton	Bigbluebutton	2.4-beta3 (including)	2.4-beta3 (including)
Bigbluebutton	Bigbluebutton	2.4-beta4 (including)	2.4-beta4 (including)
Bigbluebutton	Bigbluebutton	2.4-rc1 (including)	2.4-rc1 (including)
Bigbluebutton	Bigbluebutton	2.4-rc3 (including)	2.4-rc3 (including)
Bigbluebutton	Bigbluebutton	2.4-rc4 (including)	2.4-rc4 (including)
Bigbluebutton	Bigbluebutton	2.4-rc5 (including)	2.4-rc5 (including)

Potential Mitigations

Divide the product into anonymous, normal, privileged, and administrative areas. Reduce the attack surface by carefully mapping roles with data and functionality. Use role-based access control (RBAC) to enforce the roles at the appropriate boundaries.
Note that this approach may not protect against horizontal authorization, i.e., it will not protect a user from attacking others with the same role.
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
For example, consider using authorization frameworks such as the JAAS Authorization Framework [REF-233] and the OWASP ESAPI Access Control feature [REF-45].
For web applications, make sure that the access control mechanism is enforced correctly at the server side on every page. Users should not be able to access any unauthorized functionality or information by simply requesting direct access to that page.
One way to do this is to ensure that all pages containing sensitive information are not cached, and that all such pages restrict access to requests that are accompanied by an active and authenticated session token associated with a user who has the required permissions to access that page.

NVD	https://nvd.nist.gov/vuln/detail/CVE-2022-29236
CWE	https://cwe.mitre.org/data/definitions/285.html

Improper Authorization

Weakness

Affected Software

Potential Mitigations

References

CVE-2022-29236

Improper Authorization

Weakness

Affected Software

Potential Mitigations

Related Attack Patterns

References