Executive Summary

[{'type': 'paragraph', 'content': 'CVE-2026-2017 is a critical stack-based buffer overflow vulnerability in the IP-COM W30AP device firmware versions up to 1.0.0.11(1340). It exists in the function handling POST requests to the /goform/wx3auth endpoint, specifically in the R7WebsSecurityHandler or formWx3AuthorizeSet function.'}, {'type': 'paragraph', 'content': "The vulnerability occurs because the code retrieves two parameters, 'data' and 'extend', from the POST request and uses unsafe functions like strcpy or sprintf to copy user-controlled input into a fixed-size stack buffer without any length checks or input validation. When 'extend' equals 'pc' and 'data' contains certain strings like 'http://' or 'data=', this leads to a stack-based buffer overflow."}, {'type': 'paragraph', 'content': 'This overflow can be triggered remotely without any authentication, allowing attackers to potentially corrupt memory or execute arbitrary code on the device.'}] [1, 2, 3, 4]

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Impact Analysis

[{'type': 'paragraph', 'content': "This vulnerability can have severe impacts on the affected device and its users. Because it is a stack-based buffer overflow exploitable remotely without authentication, attackers can compromise the device's confidentiality, integrity, and availability."}, {'type': 'list_item', 'content': 'Confidentiality: Attackers may gain unauthorized access to sensitive information stored or processed by the device.'}, {'type': 'list_item', 'content': "Integrity: The device's operation or data can be manipulated or corrupted by exploiting the overflow."}, {'type': 'list_item', 'content': 'Availability: The device may crash or become unresponsive, causing denial of service.'}, {'type': 'paragraph', 'content': 'Since the exploit is publicly available and no patches or mitigations are known, the risk of exploitation is high, and affected devices should be replaced or isolated.'}] [2, 4]

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Compliance Impact

I don't know

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Detection Guidance

[{'type': 'paragraph', 'content': "This vulnerability can be detected by monitoring and analyzing HTTP POST requests sent to the endpoint /goform/wx3auth on IP-COM W30AP devices running firmware up to version 1.0.0.11(1340). Specifically, look for POST requests where the parameter 'extend' is set to 'pc' and the 'data' parameter contains strings starting with 'data=' or 'http://', followed by unusually long or suspicious content."}, {'type': 'paragraph', 'content': 'A practical detection method is to capture network traffic and filter for POST requests to /goform/wx3auth with these parameters. For example, using tcpdump or tshark:'}, {'type': 'list_item', 'content': "tcpdump -A -s 0 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)' | grep '/goform/wx3auth'"}, {'type': 'list_item', 'content': 'tshark -Y \'http.request.method == "POST" and http.request.uri contains "/goform/wx3auth"\' -T fields -e http.file_data'}, {'type': 'paragraph', 'content': 'Additionally, inspecting web server logs on the device (if accessible) for POST requests to /goform/wx3auth with the specified parameters can help detect attempts to exploit this vulnerability.'}] [4]

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Mitigation Strategies

[{'type': 'paragraph', 'content': 'There are no known patches or vendor-provided mitigations for this vulnerability as the vendor did not respond to the disclosure.'}, {'type': 'paragraph', 'content': 'Immediate mitigation steps include:'}, {'type': 'list_item', 'content': 'Restrict network access to the affected device, especially blocking remote HTTP POST requests to the /goform/wx3auth endpoint.'}, {'type': 'list_item', 'content': 'Implement firewall rules or access control lists (ACLs) to prevent untrusted sources from reaching the vulnerable service.'}, {'type': 'list_item', 'content': "Monitor network traffic for suspicious POST requests targeting /goform/wx3auth with parameters 'extend=pc' and 'data' containing suspicious payloads."}, {'type': 'list_item', 'content': 'Consider replacing the affected IP-COM W30AP device with a non-vulnerable alternative, as no patches are available.'}] [2]

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