Buffer Overflow in UTT nv518G nv518GV3

Executive Summary

This vulnerability is a buffer overflow in the UTT nv518G nv518GV3v3.2.7-210919-161313 device. It occurs in the gohead/sub_472f08 component and allows a remote attacker to cause a denial of service.

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Detection Guidance

This vulnerability can be detected by monitoring for unusual POST requests sent to the /gohead/sub_472f08 endpoint containing an excessive number of MAC addresses in the delstr parameter.

A practical detection method is to capture and analyze network traffic for POST requests targeting /gohead/sub_472f08 and inspect the delstr parameter for unusually large or malformed input.

For example, using a tool like curl to simulate or detect such requests:

• curl -X POST http://[target_ip]/gohead/sub_472f08 -d "delstr=MAC1,MAC2,...,MACn"

To detect exploitation attempts on your system, you can use network monitoring tools (e.g., tcpdump, Wireshark) to filter POST requests to /gohead/sub_472f08 and check for large delstr parameters.

• tcpdump -A -s 0 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)' | grep '/gohead/sub_472f08'

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Impact Analysis

The impact of this vulnerability is that a remote attacker can cause a denial of service on the affected device, potentially disrupting its normal operation.

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Mitigation Strategies

Immediate mitigation steps include restricting or blocking access to the /gohead/sub_472f08 endpoint to prevent remote attackers from sending malicious POST requests.

Applying firmware updates or patches from the vendor that address this buffer overflow vulnerability is critical once available.

In the meantime, implementing network-level protections such as firewall rules to limit access to the affected device or endpoint can reduce exposure.

• Block or filter POST requests to /gohead/sub_472f08 on the device or network firewall.
• Monitor logs and network traffic for suspicious activity targeting this endpoint.

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