Executive Summary

A vulnerability exists in UTT HiPER 2610G devices up to version 3.0.0-171107. It affects the strcpy function in the file /goform/formNatStaticMap. By manipulating the NatBinds argument, an attacker can cause a buffer overflow.

This vulnerability has a public exploit available, meaning attackers can use it to compromise affected devices.

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Detection Guidance

This vulnerability can be detected by monitoring for malicious HTTP POST requests targeting the /goform/formNatStaticMap endpoint on UTT HiPER 2610G devices. Specifically, detection involves identifying requests where the NatBinds parameter is excessively long or malformed, as this triggers the buffer overflow.

A practical detection method is to capture and analyze network traffic for POST requests to /goform/formNatStaticMap with unusually large or suspicious NatBinds parameters.

Example commands to detect such attempts might include using network packet capture tools like tcpdump or tshark:

• tcpdump -i <interface> -A -s 0 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)' | grep '/goform/formNatStaticMap'
• tshark -i <interface> -Y 'http.request.method == "POST" and http.request.uri contains "/goform/formNatStaticMap"' -T fields -e http.file_data

These commands help filter HTTP POST requests to the vulnerable endpoint. Further inspection of the NatBinds parameter length or content can indicate exploitation attempts.

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Mitigation Strategies

Immediate mitigation steps include restricting access to the vulnerable /goform/formNatStaticMap endpoint to trusted users only, such as by implementing network-level access controls or firewall rules.

Additionally, monitoring and blocking suspicious HTTP POST requests with oversized NatBinds parameters can help prevent exploitation.

If possible, update the firmware of the UTT HiPER 2610G device to a version later than 3.0.0-171107 where this vulnerability is fixed.

Until an official patch is available, consider disabling or limiting the use of the affected functionality if feasible.

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Impact Analysis

The buffer overflow caused by this vulnerability can potentially allow an attacker with limited privileges to execute arbitrary code or cause a denial of service on the affected device.

Since the exploit is publicly available, the risk of exploitation is higher, which could lead to unauthorized access or disruption of network services.

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