#VU57555 OS Command Injection in Six Apart Ltd products - CVE-2021-20837
Published: October 20, 2021 / Updated: March 23, 2022
Vulnerability identifier: #VU57555
Vulnerability risk: High
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber
CVE-ID: CVE-2021-20837
CWE-ID: CWE-78
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vulnerable software:
Movable Type
Movable Type Advanced
Movable Type Premium
Movable Type Premium Advanced
Movable Type
Movable Type Advanced
Movable Type Premium
Movable Type Premium Advanced
Software vendor:
Six Apart Ltd
Six Apart Ltd
Description
The vulnerability allows a remote attacker to execute arbitrary shell commands on the target system.
The vulnerability exists due to improper input validation in Movable Type XMLRPC API. A remote unauthenticated attacker can send a specially crafted message and execute arbitrary OS commands on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Remediation
Install updates from vendor's website.