CVE-2024-5244 in Omada ER605
Summary
by MITRE • 05/24/2024
TP-Link Omada ER605 Reliance on Security Through Obscurity Vulnerability. This vulnerability allows network-adjacent attackers to access or spoof DDNS messages on affected installations of TP-Link Omada ER605 routers. Authentication is not required to exploit this vulnerability. However, devices are vulnerable only if configured to use the Comexe DDNS service.
The specific flaw exists within the cmxddnsd executable. The issue results from reliance on obscurity to secure network data. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of root. Was ZDI-CAN-22439.
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Analysis
by VulDB Data Team • 08/06/2025
The CVE-2024-5244 vulnerability represents a critical security flaw in TP-Link Omada ER605 routers that fundamentally undermines the principle of security through obscurity. This vulnerability specifically affects devices configured to utilize the Comexe DDNS service, creating a dangerous attack surface that requires no authentication for exploitation. The flaw resides within the cmxddnsd executable component, which demonstrates how relying on hidden implementation details rather than robust security controls creates dangerous weaknesses in network infrastructure. The vulnerability's classification as a reliance on security through obscurity aligns with CWE-254, which identifies weaknesses where security mechanisms depend on the secrecy of implementation details rather than proven cryptographic or access control methods. Network-adjacent attackers can exploit this vulnerability to access or spoof DDNS messages, effectively compromising the router's dynamic DNS functionality and potentially enabling further attacks.
The operational impact of CVE-2024-5244 extends beyond simple unauthorized access, as it provides attackers with the capability to execute arbitrary code with root privileges. This elevated privilege execution represents a severe compromise of the device's integrity and confidentiality, allowing attackers to gain complete control over the affected router. The vulnerability's exploitation requires only network adjacency, meaning attackers do not need to overcome traditional network security controls or authentication mechanisms. This characteristic significantly reduces the attack surface and makes the vulnerability particularly dangerous in environments where network segmentation is not properly implemented. The ability to spoof DDNS messages creates opportunities for man-in-the-middle attacks, DNS cache poisoning, and potential redirection of network traffic through malicious endpoints. The fact that this vulnerability was tracked as ZDI-CAN-22439 indicates it was recognized by the cybersecurity community as a significant threat requiring immediate attention from device manufacturers and network administrators.
Mitigation strategies for CVE-2024-5244 must focus on eliminating the reliance on obscurity and implementing proper authentication and encryption mechanisms. Network administrators should immediately disable the Comexe DDNS service on affected devices if it is not essential for operations, as this removes the primary attack vector for this vulnerability. The cmxddnsd executable should be updated through official firmware releases from TP-Link, as this represents the most effective long-term solution to address the underlying implementation flaw. Organizations should also implement network monitoring to detect anomalous DDNS traffic patterns that might indicate exploitation attempts. From an ATT&CK framework perspective, this vulnerability maps to techniques involving credential access and privilege escalation, specifically T1566 for credential access through network services and T1068 for local privilege escalation. The vulnerability demonstrates how poorly implemented network services can create pathways for attackers to move laterally within networks, potentially compromising additional devices and systems. Security teams should also consider implementing network access controls and firewall rules to limit access to DDNS services and reduce the attack surface for adjacent attackers.