Executive Summary

This vulnerability is a flaw found in the UTT HiPER 1200GW device up to version 2.5.3-170306. It affects the strcpy function in the file /goform/formFireWall. Specifically, manipulating the argument named Profile causes a stack-based buffer overflow, which means that an attacker can overwrite parts of the device's memory.

Because the vulnerability is a buffer overflow, it can be exploited remotely, allowing an attacker to potentially execute arbitrary code or cause the device to crash.

The exploit for this vulnerability has already been published and may be used by attackers.

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Impact Analysis

This vulnerability can have severe impacts because it allows remote attackers to exploit a stack-based buffer overflow in the device.

• Confidentiality impact: High - attackers may gain unauthorized access to sensitive information.
• Integrity impact: High - attackers may alter or manipulate data.
• Availability impact: High - attackers may cause denial of service or crash the device.

Overall, this vulnerability can lead to complete compromise of the affected device, potentially allowing attackers to control it remotely.

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Detection Guidance

This vulnerability can be detected by monitoring for suspicious POST requests to the /goform/formFireWall endpoint, especially those containing unusually long 'destAddr' parameter values combined with 'destIP' set to 'ipRange'.

A practical detection method is to capture and analyze network traffic for such requests.

• Use a network packet capture tool like tcpdump or Wireshark to filter HTTP POST requests to /goform/formFireWall.
• Example tcpdump command to capture relevant traffic: tcpdump -i <interface> -A 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)' | grep '/goform/formFireWall'
• Inspect captured HTTP POST data for the presence of 'destIP=ipRange' and excessively long 'destAddr' parameters.

Additionally, checking router logs for repeated or malformed requests to this endpoint may help identify exploitation attempts.

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Mitigation Strategies

Immediate mitigation steps include restricting access to the /goform/formFireWall endpoint to trusted users only, as the exploit requires valid Digest authentication credentials.

Implement network-level controls such as firewall rules to block suspicious POST requests targeting this endpoint.

Monitor and block requests with unusually long 'destAddr' parameter values or those with 'destIP' set to 'ipRange'.

If possible, upgrade the firmware of the UTT HiPER 1200GW device to a version where this vulnerability is patched.

Until a patch is applied, consider disabling or limiting the use of the vulnerable formFireWall functionality if feasible.

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