CVE-2021-20116 Explained : Impact and Mitigation
Learn about CVE-2021-20116, a reflected cross-site scripting vulnerability in TCExam <= 14.8.4. Understand the impact, affected systems, exploitation, and mitigation steps.
A reflected cross-site scripting vulnerability exists in TCExam <= 14.8.4, specifically in the f, d, and dir parameters in tce_select_mediafile.php. An attacker could exploit this vulnerability to execute reflected XSS attacks by manipulating the path parameters.
Understanding CVE-2021-20116
This section provides insights into the critical aspects of CVE-2021-20116.
What is CVE-2021-20116?
CVE-2021-20116 is a reflected cross-site scripting vulnerability found in TCExam <= 14.8.4. It stems from improper validation of specific parameters in tce_select_mediafile.php, enabling attackers to launch XSS attacks.
The Impact of CVE-2021-20116
The exploitation of this vulnerability could lead to a malicious actor hijacking a victim's session or performing unauthorized actions by tricking an administrator into clicking a crafted link.
Technical Details of CVE-2021-20116
In this section, you will delve into the technical specifics of CVE-2021-20116.
Vulnerability Description
The flaw exists due to the lack of proper validation for the f, d, and dir parameters in tce_select_mediafile.php, allowing unsanitized user input to trigger XSS attacks.
Affected Systems and Versions
TCExam versions up to and including 14.8.4 are impacted by this security vulnerability.
Exploitation Mechanism
Hackers can exploit this flaw by manipulating the vulnerable parameters to execute malicious code within the context of a user's web session.
Mitigation and Prevention
This section outlines the essential steps to address and prevent CVE-2021-20116.
Immediate Steps to Take
It is crucial to update TCExam to a patched version, specifically higher than 14.8.4, to mitigate the risk of exploitation.
Long-Term Security Practices
Regular security assessments, input validation mechanisms, and user awareness training can enhance the overall security posture against XSS vulnerabilities.
Patching and Updates
Stay informed about security advisories and promptly apply patches to safeguard your systems from known vulnerabilities.