#VU82579 Stored cross-site scripting in BigBlueButton - CVE-2023-43797

Vulnerability identifier: #VU82579

Vulnerability risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-43797

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
BigBlueButton
Web applications / Modules and components for CMS

Vendor: Blindside Networks

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data in Guest Lobby. A remote user can inject and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

BigBlueButton: 2.6.0 - 2.7.0

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External links
https://github.com/bigbluebutton/bigbluebutton/commit/304bc851a00558f99a908880f4ac44234a074c9d
https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-v6wg-q866-h73x
https://github.com/bigbluebutton/bigbluebutton/pull/18392

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.