OS Command Injection in Six Apart Ltd products - CVE-2021-20837
Published: October 20, 2021 / Updated: March 23, 2022
Vulnerability identifier: #VU57555
CSH Severity: High
CVSS v4.0: 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
Vendor: Six Apart Ltd
Affected 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
Detailed vulnerability 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.
How to mitigate CVE-2021-20837
Install updates from vendor's website.