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_425994 component and allows a remote attacker to exploit it.

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Detection Guidance

This vulnerability can be detected by sending a specially crafted HTTP POST request to the affected device's `/gohead/sub_425994` component with an excessively long `Binds` parameter. Monitoring for such suspicious POST requests or unusual traffic targeting this endpoint may help identify exploitation attempts.

A proof-of-concept (PoC) involves sending an HTTP POST request with a large payload in the `Binds` parameter to trigger the heap overflow.

While no specific commands are provided, a network administrator could use tools like curl or custom scripts to simulate the PoC request for detection purposes, for example:

• curl -X POST http://[target-ip]/gohead/sub_425994 -d "Binds=$(python3 -c 'print("A"*1000)')"

Additionally, network intrusion detection systems (NIDS) could be configured to alert on unusually long POST parameters to this endpoint.

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Impact Analysis

The vulnerability can be exploited by a remote attacker to cause a denial of service (DoS) on the affected device.

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