Vulnerability identifier: #VU51110

Vulnerability risk: Low

CVSSv3.1: 5.9 [CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-23126

CWE-ID: CWE-330

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Joomla!
Web applications / CMS

Vendor: Joomla!

Description

The vulnerability allows a remote attacker to bypass 2FA.

The vulnerability exists due to usage of the insecure rand() function within the process of generating the 2FA secret. A remote attacker can guess 2FA token and bypass authentication process.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Joomla!: 3.9.0 - 3.9.24, 3.8.0 - 3.8.13, 3.7.0 - 3.7.5, 3.6.0 - 3.6.5, 3.5.0 - 3.5.9, 3.0.4, 3.3.0 - 3.3.6, 3.2.0 - 3.2.7, 3.4.0 - 3.4.8

---

External links
http://developer.joomla.org/security-centre/841-20210301-core-insecure-randomness-within-2fa-secret-generation.html

---

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.