#VU36342 OS Command Injection in pfsense - CVE-2018-4020
Published: December 3, 2018 / Updated: August 8, 2020
Vulnerability identifier: #VU36342
Vulnerability risk: Medium
CVSSv4.0: 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:Green
CVE-ID: CVE-2018-4020
CWE-ID: CWE-78
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
pfsense
pfsense
Software vendor:
Rubicon Communications
Rubicon Communications
Description
The vulnerability allows a remote privileged user to execute arbitrary code.
An exploitable command injection vulnerability exists in the way Netgate pfSense CE 2.4.4-RELEASE processes the parameters of a specific POST request. The attacker can exploit this and gain the ability to execute arbitrary commands on the system. An attacker needs to be able to send authenticated POST requests to the administration web interface. Command injection is possible in the `powerd_ac_mode` POST parameter parameter.
Remediation
Install update from vendor's website.