CVE-2021-4045 in Tapo C200
Summary
by MITRE • 03/10/2022
TP-Link Tapo C200 IP camera, on its 1.1.15 firmware version and below, is affected by an unauthenticated RCE vulnerability, present in the uhttpd binary running by default as root. The exploitation of this vulnerability allows an attacker to take full control of the camera.
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Analysis
by VulDB Data Team • 08/12/2024
The TP-Link Tapo C200 IP camera represents a significant security concern due to its exposure to unauthenticated remote code execution vulnerabilities within its firmware ecosystem. This particular vulnerability affects devices operating on firmware version 1.1.15 and earlier, creating a persistent threat vector that undermines the fundamental security posture of these network-connected devices. The issue stems from the uhttpd web server binary that runs with root privileges by default, establishing a critical attack surface that malicious actors can exploit without requiring authentication credentials.
The technical flaw manifests through the uhttpd binary's improper handling of HTTP requests, specifically within its parameter parsing and input validation mechanisms. When the web server processes certain HTTP requests, it fails to properly sanitize user-supplied input, allowing attackers to inject malicious commands that are subsequently executed with root privileges. This privilege escalation occurs because the uhttpd service operates with elevated permissions, meaning any command injection payload executed through this vulnerability directly translates into system-level control. The vulnerability's classification aligns with CWE-77 and CWE-94, representing command injection and code injection flaws respectively, which are commonly exploited in IoT device compromises.
The operational impact of this vulnerability extends far beyond simple device compromise, creating a potential gateway for broader network infiltration and persistent threats. Once an attacker gains root access to the camera, they can establish persistent backdoors, modify device configurations, capture video feeds, and potentially use the compromised device as a launch point for attacking other networked systems. The attack surface is particularly concerning given that these cameras are often deployed in residential and commercial environments where network segmentation is minimal, allowing for lateral movement and data exfiltration. This vulnerability directly maps to attack patterns documented in the MITRE ATT&CK framework under T1059 for command and scripting interpreter and T1071 for application layer protocols, demonstrating how attackers can leverage such flaws for comprehensive system compromise.
Mitigation strategies for this vulnerability require immediate firmware updates from TP-Link to address the root cause within the uhttpd binary implementation. Organizations should implement network segmentation to isolate IoT devices from critical systems, deploy intrusion detection systems to monitor for suspicious HTTP traffic patterns, and consider disabling unnecessary services on affected devices. Regular security audits of IoT device fleets are essential to identify unpatched systems, while network monitoring should specifically target anomalous command execution patterns that might indicate exploitation attempts. Additionally, implementing device authentication mechanisms and restricting external access to these devices through firewall rules can significantly reduce the attack surface and limit potential exploitation opportunities.