CVE-2021-20814 : Exploit Details and Defense Strategies
Learn about CVE-2021-20814, a cross-site scripting vulnerability in Movable Type 7 r.4903 and earlier versions allowing remote attackers to inject malicious scripts. Find out the impact and mitigation steps.
This CVE-2021-20814 affects Movable Type, specifically versions Movable Type 7 r.4903 and earlier, Movable Type Advanced 7 r.4903 and earlier, and Movable Type Premium 1.44 and earlier, provided by Six Apart Ltd.
Understanding CVE-2021-20814
This CVE is related to a cross-site scripting vulnerability found in the Setting screen of the ContentType Information Widget Plugin of Movable Type, allowing remote attackers to inject arbitrary script or HTML through unspecified vectors.
What is CVE-2021-20814?
CVE-2021-20814 is a security vulnerability in Movable Type that enables attackers to execute cross-site scripting attacks via the Setting screen of the ContentType Information Widget Plugin.
The Impact of CVE-2021-20814
The vulnerability allows malicious actors to inject and execute arbitrary scripts or HTML code on affected systems, posing a significant risk of unauthorized data access and manipulation.
Technical Details of CVE-2021-20814
The following technical aspects are crucial to understanding CVE-2021-20814:
Vulnerability Description
A cross-site scripting flaw in the Setting screen of the ContentType Information Widget Plugin in Movable Type enables remote attackers to insert unauthorized scripts or HTML content via unspecified means.
Affected Systems and Versions
Movable Type versions 7 r.4903 and earlier, Movable Type Advanced 7 r.4903 and earlier, and Movable Type Premium 1.44 and earlier are impacted by this vulnerability.
Exploitation Mechanism
Attackers with network access can exploit this vulnerability by injecting malicious code through unknown vectors.
Mitigation and Prevention
To protect systems from CVE-2021-20814, consider the following mitigation strategies:
Immediate Steps to Take
Immediately update Movable Type to the latest patched version to eliminate the vulnerability. Implement web application firewalls to block XSS attacks.
Long-Term Security Practices
Regularly monitor security mailing lists and vendor channels for updates on vulnerabilities. Train users to identify and report suspicious activities.
Patching and Updates
Apply security patches promptly and maintain an up-to-date security posture to safeguard against known vulnerabilities.