CVE-2021-31551 Explained : Impact and Mitigation
Learn about CVE-2021-31551, a security flaw in PageForms extension for MediaWiki allowing XSS attacks. Find out the impact, affected systems, and mitigation steps.
An issue was discovered in the PageForms extension for MediaWiki through version 1.35.2. Crafted payloads for Token-related query parameters allowed for XSS on certain PageForms-managed MediaWiki pages.
Understanding CVE-2021-31551
This CVE describes a vulnerability in the PageForms extension for MediaWiki that could be exploited to execute cross-site scripting (XSS) attacks on specific PageForms-managed MediaWiki pages.
What is CVE-2021-31551?
CVE-2021-31551 is a security issue in the PageForms extension for MediaWiki versions up to 1.35.2. It arises from crafted payloads within Token-related query parameters, enabling XSS attacks on targeted MediaWiki pages.
The Impact of CVE-2021-31551
This vulnerability allows malicious actors to inject and execute arbitrary script code within the context of the affected MediaWiki pages. Successful exploitation could result in unauthorized access, data manipulation, and potential further attacks.
Technical Details of CVE-2021-31551
The technical details of CVE-2021-31551 include:
Vulnerability Description
The vulnerability stems from inadequate validation of Token-related query parameters in PageForms, leading to XSS exposure.
Affected Systems and Versions
MediaWiki versions through 1.35.2 with the PageForms extension are affected by this vulnerability.
Exploitation Mechanism
Attackers can exploit this vulnerability by inserting specially-crafted payloads into Token-related query parameters, triggering XSS attacks on specific MediaWiki pages.
Mitigation and Prevention
To safeguard systems from CVE-2021-31551, consider the following measures:
Immediate Steps to Take
- Disable the PageForms extension in affected MediaWiki instances.
- Implement strict input validation and output encoding practices.
Long-Term Security Practices
- Regularly update MediaWiki and its extensions to the latest secure versions.
- Conduct security audits and penetration testing to identify and mitigate similar vulnerabilities.
Patching and Updates
Apply patches or security updates provided by MediaWiki to address the CVE-2021-31551 vulnerability and enhance overall system security.