Buffer Overflow in UTT nv518G nv518GV3 Firmware

Executive Summary

This vulnerability is a buffer overflow in the UTT nv518G nv518GV3v3.2.7-210919-161313 device. It occurs in the gohead/sub_447CAC component and allows a remote attacker to cause a denial of service.

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Detection Guidance

This vulnerability can be detected by sending crafted POST requests to the `/formLinkageConfReName` endpoint with excessively long `oldName` or `newName` parameters. If the system is vulnerable, these requests may cause a denial of service or unexpected behavior due to buffer overflow.

A detection command example using curl would be:

• curl -X POST http://<target-ip>/formLinkageConfReName -d "oldName=$(python3 -c 'print("A"*50)')&newName=test&statustr=1"
• curl -X POST http://<target-ip>/formLinkageConfReName -d "oldName=test&newName=$(python3 -c 'print("B"*50)')&statustr=1"

These commands send payloads with long strings (over 40 bytes) to trigger the buffer overflow condition. Monitoring the device for crashes or abnormal behavior after these requests can indicate the presence of the vulnerability.

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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:

• Avoid exposing the vulnerable endpoint `/formLinkageConfReName` to untrusted networks or the internet.
• Apply any available firmware updates or patches from the vendor that address this buffer overflow vulnerability.
• Implement network-level protections such as firewalls or intrusion prevention systems to block suspicious POST requests with unusually long parameters targeting this endpoint.
• Monitor system logs and device behavior for signs of exploitation attempts or crashes.

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