CVE-2018-12576 in TL-WR841N
Summary
by MITRE
TP-Link TL-WR841N v13 00000001 0.9.1 4.16 v0001.0 Build 180119 Rel.65243n devices allow clickjacking.
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Analysis
by VulDB Data Team • 02/23/2020
The TP-Link TL-WR841N v13 00000001 0.9.1 4.16 v0001.0 Build 180119 Rel.65243n router firmware contains a critical clickjacking vulnerability that exposes administrators to unauthorized administrative actions. This vulnerability arises from the absence of proper clickjacking protection mechanisms within the web-based management interface, allowing malicious actors to deceive users into performing unintended administrative operations through carefully crafted deceptive web pages. The flaw affects the device's user authentication and authorization system, potentially enabling attackers to gain full administrative control over the network infrastructure.
The technical implementation of this vulnerability stems from the lack of defensive measures such as the X-Frame-Options HTTP response header or Content Security Policy frame-ancestors directives in the router's web interface responses. When users navigate to the router's management portal, the absence of these security headers allows the interface to be embedded within malicious websites through iframe elements. Attackers can create deceptive web pages that overlay legitimate administrative controls with malicious actions, tricking unsuspecting administrators into clicking on seemingly harmless interface elements that actually execute unauthorized commands. This vulnerability operates at the application layer and affects the web application security model of the device's management interface, making it particularly dangerous for network administrators who regularly access their router's configuration through web browsers.
The operational impact of this vulnerability extends beyond simple unauthorized access to encompass complete network compromise and potential data exfiltration. An attacker exploiting this clickjacking vulnerability can perform administrative actions such as changing network configurations, modifying user credentials, disabling security features, or redirecting network traffic without the administrator's knowledge or consent. The vulnerability is particularly concerning because it can be exploited remotely without requiring any local access or authentication credentials, making it accessible to attackers with only basic web development knowledge. Network administrators who regularly interact with their router's web interface become prime targets, as the attack can be executed simply by visiting a malicious website while logged into the router's management portal. This vulnerability effectively undermines the security model of the device's authentication system and can lead to complete network takeover.
Mitigation strategies for this clickjacking vulnerability should include immediate implementation of proper frame-ancestors policies through the addition of X-Frame-Options headers or Content Security Policy directives to all web responses from the router's management interface. Network administrators should disable unnecessary web management interfaces when not actively required and consider implementing additional authentication layers such as two-factor authentication or role-based access controls. The vulnerability aligns with CWE-1021, which specifically addresses inadequate protection against clickjacking attacks, and maps to ATT&CK technique T1078.004, which covers valid accounts for privilege escalation. Organizations should also implement network monitoring to detect unusual administrative activities and ensure that all router firmware is updated to versions that address this specific vulnerability. Regular security audits of network infrastructure components should include assessment of web application security controls to prevent similar clickjacking vulnerabilities from existing in other network devices.