Executive Summary

This vulnerability exists in the UTT 进取 512W device up to version 3.1.7.7-171114. It affects the strcpy function in the /goform/formNatStaticMap file of the Endpoint component. By manipulating the NatBind argument, an attacker can cause a buffer overflow. This vulnerability can be exploited remotely and the exploit has been publicly disclosed.

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Impact Analysis

The vulnerability can lead to a buffer overflow, which may allow an attacker to execute arbitrary code remotely on the affected device. This can compromise the device's integrity, availability, and confidentiality, potentially leading to unauthorized access or control over the device.

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Detection Guidance

This vulnerability can be detected by monitoring for suspicious POST requests to the /goform/formNatStaticMap endpoint, especially those containing an oversized NatBind parameter. A practical detection method is to capture and analyze HTTP traffic targeting the device's IP (e.g., 192.168.1.1) for unusually large payloads in the NatBind parameter. For example, using a tool like curl to simulate or detect such requests: curl -X POST http://192.168.1.1/goform/formNatStaticMap -d "NatBind=<large_payload>". Network intrusion detection systems (NIDS) can be configured to alert on POST requests to /goform/formNatStaticMap with large or malformed NatBind parameters. Additionally, packet capture tools like tcpdump or Wireshark can be used to filter HTTP POST requests to this endpoint for manual inspection. [3]

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Mitigation Strategies

There are no known patches or vendor-provided mitigations for this vulnerability. The recommended immediate step is to replace the affected UTT 进取 512W device with an alternative product that is not vulnerable. Until replacement, restrict network access to the device, especially blocking remote access to the /goform/formNatStaticMap endpoint to prevent exploitation. Implement network-level controls such as firewall rules to limit exposure and monitor for exploit attempts. Consider disabling or isolating the vulnerable device from untrusted networks. [1]

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Detection Guidance

This vulnerability can be detected by monitoring for suspicious POST requests to the /goform/formNatStaticMap endpoint, especially those containing an oversized NatBind parameter or missing the Action parameter. A practical detection method is to capture and analyze HTTP traffic targeting the device's IP (e.g., 192.168.1.1) for such crafted requests. For example, using tcpdump or Wireshark to filter HTTP POST requests to /goform/formNatStaticMap and inspecting the NatBind parameter length can help identify exploitation attempts. Additionally, you can use curl or similar tools to test the endpoint with crafted payloads to verify if the device is vulnerable. Example command to capture traffic: tcpdump -i <interface> -A 'tcp port 80 and (((ip dst host 192.168.1.1) and (tcp[((tcp[12:1] & 0xf0) >> 2):4] = 0x504f5354)))' (This filters HTTP POST requests to the device). [2, 3]

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Mitigation Strategies

There are no known patches or vendor-provided mitigations for this vulnerability. Immediate mitigation steps include replacing the affected UTT 进取 512W device with a non-vulnerable alternative. Additionally, you can implement network-level protections such as blocking or filtering HTTP POST requests to the /goform/formNatStaticMap endpoint from untrusted networks, restricting access to the device management interface, and monitoring for exploitation attempts. Applying strict firewall rules and isolating the device from untrusted networks can reduce exposure. Ultimately, product replacement is recommended to avoid exploitation. [1]

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Compliance Impact

This vulnerability compromises the confidentiality, integrity, and availability of the affected system, which can lead to non-compliance with common standards and regulations such as GDPR and HIPAA that require protection of sensitive data and system integrity. Since the vulnerability allows remote, unauthenticated exploitation and no mitigations or patches are available, affected organizations may face increased risk of data breaches or service disruptions, potentially violating regulatory requirements for data protection and system security. [1]

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