Vulnerability identifier: #VU65373

Vulnerability risk: Critical

CVSSv3.1: 9.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2021-45461

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Phone Apps
Web applications / Modules and components for CMS

Vendor: FreePBX

Description

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to insufficient validation of user-supplied input in the Phone Apps (restapps) module for FreePBX. A remote attacker can send specially crafted input to the application and execute arbitrary code on the system.

Note, the vulnerability is being actively exploited in the wild.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Phone Apps: 15.0.19.87 - 16.0.18.41

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External links
http://community.freepbx.org/t/security-issue-potential-rest-phone-apps-rce/80109
http://wiki.freepbx.org/display/FOP/2021-12-21+SECURITY%3A+Potential+Rest+Phone+Apps+RCE
http://community.freepbx.org/t/0-day-freepbx-exploit/80092

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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?

Yes. This vulnerability is being exploited in the wild.