Detection Guidance

[{'type': 'paragraph', 'content': 'This vulnerability can be detected by monitoring for unusual POST requests to the endpoint /boafrm/formWanConfigSetup on the D-Link DWR-M960 router running firmware version 1.01.07. Specifically, look for HTTP POST requests containing an excessively long or malformed submit-url parameter, which is the vector for the stack-based buffer overflow.'}, {'type': 'paragraph', 'content': 'A practical detection method involves capturing network traffic and filtering for POST requests to /boafrm/formWanConfigSetup. For example, using tcpdump or tshark:'}, {'type': 'list_item', 'content': "tcpdump -i <interface> -A -s 0 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)' | grep '/boafrm/formWanConfigSetup'"}, {'type': 'list_item', 'content': 'tshark -Y \'http.request.method == "POST" and http.request.uri contains "/boafrm/formWanConfigSetup"\' -T fields -e http.file_data'}, {'type': 'paragraph', 'content': 'Additionally, inspecting the length of the submit-url parameter in these POST requests can help identify attempts to exploit the buffer overflow by spotting abnormally long values.'}] [2]

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Mitigation Strategies

[{'type': 'paragraph', 'content': "Immediate mitigation steps for this vulnerability include restricting access to the affected device's management interface to trusted networks only, such as internal LAN segments, to prevent remote exploitation."}, {'type': 'paragraph', 'content': 'Since no known software patches or mitigations are available, it is recommended to replace the affected D-Link DWR-M960 router running firmware version 1.01.07 with an alternative device or updated firmware once available.'}, {'type': 'paragraph', 'content': 'As a temporary measure, monitoring and blocking suspicious POST requests to /boafrm/formWanConfigSetup containing unusually long submit-url parameters via network firewalls or intrusion detection/prevention systems can reduce risk.'}] [1, 2]

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Compliance Impact

I don't know

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Executive Summary

[{'type': 'paragraph', 'content': 'CVE-2026-2884 is a critical stack-based buffer overflow vulnerability found in the D-Link DWR-M960 router, version 1.01.07. The flaw exists in the function sub_41914C within the file /boafrm/formWanConfigSetup, which is part of the WAN Interface Setting Handler component.'}, {'type': 'paragraph', 'content': 'The vulnerability arises from improper handling of the "submit-url" argument, where manipulation with crafted input leads to a stack-based overflow condition. Specifically, the function uses the unsafe strcpy operation to copy the submit-url content into a fixed-size global buffer without validating the input length, allowing an attacker to supply an oversized submit-url parameter.'}, {'type': 'paragraph', 'content': 'This lack of bounds checking causes out-of-bounds memory writes, which can lead to denial of service by crashing the embedded web server or device reboot, or more critically, arbitrary code execution with root privileges by hijacking execution flow.'}, {'type': 'paragraph', 'content': 'The attack can be launched remotely without authentication, making it highly exploitable, and a proof-of-concept exploit is publicly available.'}] [1, 2, 3]

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Impact Analysis

[{'type': 'paragraph', 'content': 'Exploitation of this vulnerability can impact the confidentiality, integrity, and availability of the affected device.'}, {'type': 'list_item', 'content': 'Denial of Service (DoS) by crashing the embedded web server or causing the device to reboot.'}, {'type': 'list_item', 'content': "Arbitrary code execution with root privileges, allowing an attacker to hijack the device's execution flow."}, {'type': 'list_item', 'content': 'Remote exploitation without authentication, increasing the risk and ease of attack.'}] [1, 2, 3]

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