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XSS in username that will trigger by sending chat

High
antobinary published GHSA-hwv2-5pf5-hr87 Jun 22, 2022

Package

No package listed

Affected versions

2.3, <2.4.8, <2.5.0

Patched versions

2.4.8, 2.5.0

Description

Impact

Users in meeting with private chat enabled.

Description

Pentests.nl has discovered a vulnerability in BigBlueButton which could be exploited to perform stored Cross-Site Scripting (XSS) attacks by sending private messages to users.

Patches

Patched on BigBlueButton 2.4.8 and higher.
Patched on BigBlueButton 2.5.0 and higher.

Workarounds

No workarounds.

References

Security advisory https://pentests.nl/pentest-blog/stored-xss-in-bigbluebutton/
Patched on BigBlueButton 2.5 #15067
Patched on BigBlueButton 2.4 #15090

For more information

If you have any questions or comments about this advisory:

Email us at security at bigbluebutton.org

Credits

We thank Rick Verdoes and Danny de Weille from Hackify - https://pentests.nl/, who examined the BigBlueButton code base and responsibly disclosed this vulnerability.

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

CVE ID

CVE-2022-31064

Weaknesses

No CWEs