Vulnerability identifier: #VU48706

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-29043

CWE-ID: CWE-862

Exploitation vector: Network

Exploit availability: No

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

Vendor: Blindside Networks

Description

The vulnerability allows a remote attacker to bypass security restrictions on the target system. 

The vulnerability exists due to missing authorization in the "account_activations/edit?token=" URI. A remote attacker can create an approved user account associated with an email address that has an arbitrary domain name.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

BigBlueButton: 0.7 - 3.0.0 beta.4

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External links
http://packetstormsecurity.com/files/160239/BigBlueButton-2.2.29-E-mail-Validation-Bypass.html
http://cxsecurity.com/issue/WLB-2020110211
http://github.com/bigbluebutton/bigbluebutton/releases

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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