#VU61366 Improper access control in pfsense and pfSense Plus - CVE-2022-26019

Vulnerability identifier: #VU61366

Vulnerability risk: Low

CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2022-26019

CWE-ID: CWE-284

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
pfsense
Server applications / IDS/IPS systems, Firewalls and proxy servers
pfSense Plus
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor: Rubicon Communications

Description

The vulnerability allows a remote user to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions in services_ntpd_gps.php. A remote administrator can rewrite existing files on the file system and execute arbitrary code on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

pfsense: 1.0.x - 2.5.2

pfSense Plus: before 22.01

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External links
https://jvn.jp/en/jp/JVN87751554/index.html
https://docs.netgate.com/downloads/pfSense-SA-22_01.webgui.asc

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Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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