CVE-2021-30119 : Exploit Details and Defense Strategies
Discover the impact of CVE-2021-30119, an authentication reflective XSS vulnerability in Kaseya VSA. Learn about affected systems, exploitation, mitigation steps, and prevention measures.
Authentication reflective Cross-Site Scripting (XSS) vulnerability was discovered in Kaseya VSA <= v9.5.6. This vulnerability allows attackers to execute malicious scripts on authenticated users' browsers through manipulated input parameters.
Understanding CVE-2021-30119
This section will provide an in-depth analysis of the CVE-2021-30119 vulnerability in Kaseya VSA.
What is CVE-2021-30119?
CVE-2021-30119 is an authenticated reflective XSS vulnerability found in Kaseya VSA version 9.5.6 and below. It enables attackers to inject and execute arbitrary scripts in the context of authenticated users.
The Impact of CVE-2021-30119
The impact of this vulnerability is rated as MEDIUM. Attackers can exploit this flaw to inject malicious scripts, potentially leading to sensitive data exposure or unauthorized actions on an affected system.
Technical Details of CVE-2021-30119
This section delves into the technical specifics of the CVE-2021-30119 vulnerability.
Vulnerability Description
The vulnerability resides in HelpDeskTab/rcResults.asp and done.asp, where insecurely returned parameters can be manipulated to conduct XSS attacks, allowing threat actors to execute harmful scripts.
Affected Systems and Versions
Kaseya VSA versions up to and including 9.5.6 are impacted by this vulnerability. Users of these versions are at risk of exploitation.
Exploitation Mechanism
Through crafted requests to HelpDeskTab/rcResults.asp and done.asp, attackers can embed malicious scripts in parameters like 'result' and 'FileName,' exploiting this XSS flaw.
Mitigation and Prevention
This section outlines the necessary steps to mitigate and prevent exploitation of CVE-2021-30119.
Immediate Steps to Take
Upgrade to a version of Kaseya VSA that is above 9.5.6 to ensure the elimination of this vulnerability and protect systems from potential XSS attacks.
Long-Term Security Practices
Implement robust security practices such as input validation, output encoding, and secure coding to prevent XSS vulnerabilities in web applications.
Patching and Updates
Regularly apply security patches and updates provided by Kaseya to address known vulnerabilities and enhance the security posture of the VSA application.