CVE-2022-42998 in DIR-816 A2
Summary
by MITRE • 10/26/2022
D-Link DIR-816 A2 1.10 B05 was discovered to contain a stack overflow via the srcip parameter at /goform/form2IPQoSTcAdd.
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Analysis
by VulDB Data Team • 05/07/2025
The vulnerability identified as CVE-2022-42998 affects D-Link DIR-816 A2 routers running firmware version 1.10 B05 and represents a critical stack overflow condition within the device's web interface management system. This flaw exists in the /goform/form2IPQoSTcAdd endpoint where the srcip parameter is processed without adequate input validation or bounds checking. The stack overflow vulnerability creates a potential pathway for remote code execution and system compromise, as attackers can manipulate the srcip parameter to overwrite stack memory locations and potentially inject malicious code into the router's operating system.
The technical implementation of this vulnerability stems from improper handling of user-supplied input within the router's web form processing logic. When the device receives a request containing the srcip parameter, it fails to validate the input length or content before passing it to stack-based functions. This lack of input sanitization allows an attacker to craft a malicious payload that exceeds the allocated stack buffer space, causing a stack overflow condition that can be exploited to redirect program execution flow. The vulnerability manifests as a classic buffer overflow scenario where the device's memory management fails to properly handle oversized input data, creating opportunities for arbitrary code execution and complete system takeover.
The operational impact of this vulnerability extends beyond simple denial of service conditions, as it enables full system compromise of affected D-Link routers. An attacker with remote access to the network can exploit this vulnerability to execute arbitrary code with the privileges of the web server process, potentially leading to complete network infiltration, data exfiltration, and persistent backdoor installation. The vulnerability affects devices that are commonly deployed in home and small office environments, making them attractive targets for cybercriminals seeking to establish persistent network footholds. The exploitation of this vulnerability aligns with ATT&CK technique T1059.007 for command and scripting interpreter and T1078.004 for valid accounts, as it allows attackers to gain system-level access and maintain persistence within network infrastructure.
Security mitigation strategies for this vulnerability should include immediate firmware updates from D-Link, which typically address the buffer overflow by implementing proper input validation and bounds checking mechanisms. Network administrators should also consider implementing network segmentation and access controls to limit exposure of affected devices to untrusted networks. The vulnerability maps to CWE-121 Stack-based Buffer Overflow, which is classified as a critical weakness in software security design. Additional defensive measures include monitoring network traffic for suspicious patterns in the /goform/form2IPQoSTcAdd endpoint and implementing web application firewalls to filter malicious requests before they reach the vulnerable system. Organizations should also conduct comprehensive vulnerability assessments to identify other potentially affected devices within their network infrastructure and ensure proper network hygiene practices are maintained.