CVE-2021-26844 in PA Server Monitor
Summary
by MITRE • 11/05/2021
A cross-site scripting (XSS) vulnerability in Power Admin PA Server Monitor 8.2.1.1 allows remote attackers to inject arbitrary web script or HTML via Console.exe.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 11/10/2021
The vulnerability identified as CVE-2021-26844 represents a critical cross-site scripting flaw within Power Admin PA Server Monitor version 8.2.1.1 that exposes organizations to significant web application security risks. This vulnerability specifically affects the Console.exe component of the server monitoring solution, which serves as the primary interface for system administrators to manage and monitor their network infrastructure. The flaw enables remote attackers to execute malicious scripts within the context of authenticated user sessions, potentially compromising the entire monitoring environment and the sensitive data it handles.
The technical nature of this vulnerability stems from insufficient input validation and output encoding within the Console.exe application. When user-supplied data is processed and rendered without proper sanitization, attackers can inject malicious JavaScript code or HTML content that gets executed in the browser of any user who views the affected page. This represents a classic XSS vulnerability categorized under CWE-79, which specifically addresses improper neutralization of input during web page generation. The vulnerability is particularly concerning because it affects a monitoring tool that typically operates with elevated privileges and has access to critical system information, making it an attractive target for attackers seeking persistent access to network infrastructure.
From an operational impact perspective, this vulnerability creates multiple attack vectors that can be exploited by threat actors to compromise the integrity of the monitoring environment. Attackers can leverage this flaw to steal session cookies, redirect users to malicious sites, deface web interfaces, or execute commands on behalf of authenticated users. The implications extend beyond simple data theft as the compromised monitoring system could provide attackers with insights into network topology, system configurations, and security posture that would otherwise remain hidden. This vulnerability directly maps to several ATT&CK techniques including T1566 for credential access through social engineering and T1071 for application layer protocol usage, as the attack chain typically involves web-based exploitation of the monitoring interface.
Organizations utilizing Power Admin PA Server Monitor 8.2.1.1 must implement immediate mitigation strategies to protect their infrastructure from potential exploitation. The primary recommendation involves applying the vendor-provided security patches and updates as soon as they become available, which should address the input validation gaps in the Console.exe component. Additionally, implementing proper output encoding and input validation mechanisms can help prevent similar vulnerabilities from occurring in other parts of the application. Network segmentation and privilege separation should be enforced to limit the potential impact of successful exploitation, while regular security monitoring and web application firewalls can help detect and block malicious payloads. The vulnerability also underscores the importance of maintaining up-to-date security patches across all monitoring and administrative tools, as these systems often serve as prime targets for attackers seeking persistent access to enterprise networks. Organizations should conduct thorough security assessments of their monitoring infrastructure to identify other potential XSS vulnerabilities that may exist within similar administrative interfaces.