CVE-2012-6316 in TL-WR841N
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in the TP-LINK TL-WR841N router with firmware 3.13.9 Build 120201 Rel.54965n and earlier allow remote administrators to inject arbitrary web script or HTML via the (1) username or (2) pwd parameter to userRpm/NoipDdnsRpm.htm.
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Analysis
by VulDB Data Team • 03/13/2019
The CVE-2012-6316 vulnerability represents a critical cross-site scripting flaw in TP-LINK TL-WR841N wireless routers running firmware versions 3.13.9 Build 120201 Rel.54965n and earlier. This vulnerability resides within the web-based management interface of the router, specifically in the userRpm/NoipDdnsRpm.htm page which handles dynamic DNS configuration settings. The flaw enables remote attackers with administrative privileges to inject malicious scripts into the router's web interface, creating a persistent security risk that can compromise the entire network infrastructure. The vulnerability is particularly concerning because it affects the authentication parameters of the router's management console, making it possible for attackers to manipulate the administrative interface without proper authorization.
The technical implementation of this vulnerability stems from inadequate input validation and output encoding within the router's web application. When administrators access the NoipDdnsRpm.htm page to configure dynamic DNS settings, the application fails to properly sanitize the username and pwd parameters that are passed through the HTTP request. This lack of proper input sanitization creates an XSS vector where malicious payloads can be executed in the context of the authenticated administrator's browser session. The vulnerability is classified as a reflected XSS issue under CWE-79, where the malicious script is reflected off the web server back to the user's browser. The flaw occurs because the router's web interface directly incorporates user-supplied input into web pages without proper HTML escaping or context-appropriate encoding mechanisms.
The operational impact of this vulnerability extends far beyond simple script injection, creating a significant threat vector for network compromise. An attacker who can establish an administrative session on the router can leverage this XSS vulnerability to execute arbitrary JavaScript code in the browser of any authenticated user accessing the router's management interface. This capability enables numerous attack vectors including session hijacking, credential theft, and the potential for privilege escalation to full administrative control of the router. The vulnerability particularly affects the router's authentication system since it allows manipulation of the username and password fields that are crucial for administrative access. According to ATT&CK framework, this vulnerability maps to T1071.004 for application layer protocol: DNS and T1566 for credential access through social engineering or compromised credentials. The impact is amplified by the fact that many users may not immediately notice the presence of malicious scripts in the router's management interface, leading to prolonged exposure.
Mitigation strategies for CVE-2012-6316 should focus on immediate firmware updates and network segmentation approaches. The primary remediation involves upgrading the router firmware to a version that properly validates and sanitizes input parameters before incorporating them into web responses. Organizations should implement strict network monitoring to detect unusual traffic patterns that might indicate exploitation attempts, particularly focusing on the specific URL path userRpm/NoipDdnsRpm.htm. Network segmentation and access control measures should be implemented to limit administrative access to router interfaces, ensuring that only authorized personnel can access the management console. Additionally, implementing web application firewalls that can detect and block XSS payloads targeting router management interfaces provides an additional layer of protection. Security awareness training for network administrators should emphasize the importance of keeping firmware updated and monitoring for unusual activity in router management interfaces. The vulnerability demonstrates the critical importance of input validation and output encoding in web applications, aligning with security best practices outlined in OWASP Top Ten and NIST cybersecurity frameworks. Regular vulnerability assessments of network infrastructure components should include checks for similar input validation flaws in other network devices to prevent similar exploitation vectors.