CVE-2025-2550 in DIR-618
Summary
by MITRE • 03/20/2025
A vulnerability was found in D-Link DIR-618 and DIR-605L 2.02/3.02 and classified as problematic. Affected by this issue is some unknown functionality of the file /goform/formSetDDNS of the component DDNS Service. The manipulation leads to improper access controls. The attack needs to be initiated within the local network. The exploit has been disclosed to the public and may be used. This vulnerability only affects products that are no longer supported by the maintainer.
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Analysis
by VulDB Data Team • 03/21/2025
The vulnerability identified as CVE-2025-2550 represents a critical access control flaw within the D-Link DIR-618 and DIR-605L wireless routers, specifically affecting firmware versions 2.02 and 3.02. This issue resides within the Dynamic Domain Name System (DDNS) service component, which is responsible for maintaining dynamic IP address mappings for network devices. The affected file /goform/formSetDDNS serves as the interface for DDNS configuration settings, making it a prime target for unauthorized access attempts. The vulnerability stems from inadequate input validation and authentication checks within this particular service endpoint, allowing malicious actors to bypass normal access controls and manipulate DDNS settings without proper authorization. This weakness creates a significant security risk for users who rely on these routers for network connectivity and remote access management.
The technical exploitation of this vulnerability requires local network access, meaning an attacker must be physically present on the same network segment as the affected device or have established a network connection that allows them to reach the router's internal network. This constraint reduces the attack surface compared to remotely exploitable vulnerabilities but does not eliminate the threat entirely, as local network access can be gained through various means including compromised devices, unauthorized physical access, or network infiltration techniques. The improper access controls manifest when the system fails to properly validate user credentials or session tokens before allowing modifications to DDNS configuration parameters. This flaw allows unauthorized modification of domain name settings, potentially enabling attackers to redirect network traffic or establish unauthorized access points that could compromise the entire network infrastructure.
The operational impact of this vulnerability extends beyond simple configuration changes, as DDNS services are commonly used for remote network access, backup systems, and cloud connectivity management. When compromised, attackers can manipulate DNS records to redirect traffic to malicious servers, potentially leading to man-in-the-middle attacks, data exfiltration, or unauthorized network access. The vulnerability affects devices that are no longer supported by the manufacturer, which means users cannot receive official security updates or patches to address the issue. This lack of support creates a persistent security risk for organizations and individuals who continue to use these older devices, as they remain vulnerable to exploitation while the manufacturer has ceased providing security maintenance. The public disclosure of this exploit further compounds the risk, as malicious actors can readily implement attack techniques without requiring advanced technical skills or specialized tools.
Organizations and individuals using affected D-Link routers should implement immediate mitigations to reduce the risk of exploitation. The most effective approach involves disabling the DDNS service entirely if it is not required, as this eliminates the attack vector entirely. Network segmentation and access control measures should be implemented to limit local network access to authorized personnel only, reducing the likelihood of unauthorized exploitation. Regular network monitoring for unusual DDNS configuration changes or suspicious network traffic patterns can help detect potential exploitation attempts. Additionally, implementing network access control lists and firewall rules to restrict access to the router's administrative interfaces can provide additional layers of protection. Users should also consider replacing unsupported devices with newer models that receive regular security updates and have active manufacturer support. The vulnerability aligns with CWE-284, which addresses improper access control, and represents a specific instance of how legacy device support gaps can create persistent security risks in enterprise and home network environments. Organizations should also consider mapping this vulnerability to ATT&CK techniques related to privilege escalation and persistence, as unauthorized DDNS modifications can be used to maintain long-term access to compromised networks. Given the lack of official patches for these unsupported devices, the primary defense mechanisms must rely on network-level controls and operational security measures rather than software-based fixes.