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_416f28 component and can be exploited remotely by an attacker.

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Detection Guidance

This vulnerability can be detected by sending a specially crafted HTTP POST request to the vulnerable endpoint that includes an excessively long GroupName parameter. The buffer overflow occurs when the GroupName value is too large.

A proof-of-concept involves an HTTP POST request targeting the /gohead/sub_416f28 component with a long GroupName value to trigger the overflow.

While no exact commands are provided, testing can involve sending HTTP POST requests with large payloads in the GroupName field to observe if the system crashes or behaves unexpectedly.

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Impact Analysis

The vulnerability allows a remote attacker to cause a denial of service (DoS) on the affected device, potentially disrupting its normal operation.

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Compliance Impact

The vulnerability is a buffer overflow in the UTT nv518G nv518GV3v3.2.7-210919-161313 firmware that allows a remote attacker to cause a denial of service. It does not directly impact confidentiality or integrity, as the CVSS score indicates no impact on confidentiality or integrity (C:N/I:N), only availability (A:H).

Since the vulnerability leads to denial of service without direct data breach or unauthorized data access, its effect on compliance with standards like GDPR or HIPAA is indirect. However, denial of service could disrupt availability of services, which may be relevant under regulations requiring system availability and reliability.

No explicit information is provided about data exposure or privacy violations related to this vulnerability, so specific compliance impacts cannot be confirmed from the provided data.

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Mitigation Strategies

Immediate mitigation steps include updating the firmware of the affected device to a version that patches the buffer overflow vulnerability.

Since the vulnerability is triggered by a long GroupName parameter in an HTTP POST request, restricting or filtering unusually large input sizes on this parameter at the network or application level can help reduce risk.

Additionally, monitoring and blocking suspicious HTTP POST requests targeting the /gohead/sub_416f28 endpoint may help prevent exploitation.

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