Executive Summary

[{'type': 'paragraph', 'content': 'This vulnerability exists in the UTT HiPER 1250GW router firmware versions up to 3.2.7-210907-180535. It is caused by improper handling of the "GroupName" parameter in the API endpoint /goform/setSysAdm. Specifically, the unsafe use of the strcpy function copies attacker-controlled input into a fixed-size buffer without checking its length, leading to a stack-based buffer overflow.'}, {'type': 'paragraph', 'content': 'An attacker can exploit this remotely by sending a specially crafted POST request with an excessively large payload in the "passwd1" parameter, causing the router to overflow its stack buffer.'}, {'type': 'paragraph', 'content': 'This overflow can crash the router, resulting in a denial of service condition.'}] [1]

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Impact Analysis

Exploitation of this vulnerability allows a remote attacker to cause a denial of service (DoS) on the affected router by crashing its system through a buffer overflow.

This can disrupt network connectivity and availability, potentially impacting all devices relying on the router for network access.

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Compliance Impact

I don't know

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Detection Guidance

[{'type': 'paragraph', 'content': 'This vulnerability can be detected by monitoring for suspicious POST requests to the API endpoint `/goform/setSysAdm` that contain an excessively large payload in the "passwd1" parameter.'}, {'type': 'paragraph', 'content': 'A practical detection method is to capture and analyze network traffic for such requests, especially those with unusually long strings in the "passwd1" field.'}, {'type': 'paragraph', 'content': 'For example, using a tool like tcpdump or Wireshark, you can filter HTTP POST requests to `/goform/setSysAdm` and inspect the payload size.'}, {'type': 'list_item', 'content': "tcpdump -A -s 0 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)'"}, {'type': 'list_item', 'content': 'Use Wireshark to filter HTTP POST requests with the filter: http.request.method == "POST" and http.request.uri contains "/goform/setSysAdm"'}, {'type': 'paragraph', 'content': 'Inspect the POST data for the "passwd1" parameter containing abnormally long strings, which may indicate an attempt to exploit the buffer overflow.'}] [1]

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Mitigation Strategies

Immediate mitigation steps include restricting access to the vulnerable API endpoint `/goform/setSysAdm` to trusted users only.

Implement network-level controls such as firewall rules to block unauthorized remote access to the device.

Avoid using the affected firmware versions up to 3.2.7-210907-180535 and upgrade to a patched version if available.

Monitor the device for signs of exploitation such as unexpected crashes or denial of service conditions.

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