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 exists in the gohead/sub_448384 component and can be exploited remotely by an attacker.

A buffer overflow occurs when more data is written to a buffer than it can hold, which can lead to unexpected behavior or crashes.

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Detection Guidance

This vulnerability can be detected by sending a specially crafted HTTP POST request to the vulnerable endpoint `/gohead/sub_448384` with an excessively long `isGroupOpt` parameter. Monitoring for such abnormal requests or attempts to exploit this buffer overflow can help identify the vulnerability.

A detection command example using curl might be:

• curl -X POST http://<target-ip>/gohead/sub_448384 -d "isGroupOpt=$(python3 -c 'print("A"*1000)')"

This command sends a long string of 'A's as the `isGroupOpt` parameter to test if the system is vulnerable to the buffer overflow.

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Impact Analysis

This vulnerability allows a remote attacker to cause a denial of service (DoS) on the affected device.

A denial of service means the device or service may become unavailable or crash, disrupting normal operations.

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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 of data, as the CVSS indicates no impact on confidentiality or integrity, only availability.

Since the vulnerability leads to denial of service without evidence of data breach or unauthorized data access, it does not directly violate compliance requirements related to data protection standards such as GDPR or HIPAA, which primarily focus on protecting personal data confidentiality and integrity.

However, denial of service could indirectly affect compliance if it disrupts availability of critical systems or services required under these regulations.

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Mitigation Strategies

Immediate mitigation steps include restricting access to the vulnerable endpoint `/gohead/sub_448384` by implementing network-level controls such as firewalls or access control lists to block unauthorized or suspicious HTTP POST requests.

Additionally, monitoring and filtering HTTP requests to detect and block attempts with unusually long `isGroupOpt` parameters can reduce the risk of exploitation.

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

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