Executive Summary

CVE-2026-2904 is a critical buffer overflow vulnerability in the UTT HiPER 810G router, specifically version 1.7.7-171114. It occurs in the handling of the HTTP request to the endpoint /goform/ConfigExceptAli, where the unsafe use of the strcpy function copies input data without checking its size. This improper copying allows an attacker to overwrite memory, leading to a buffer overflow.

The vulnerability can be triggered remotely by sending a specially crafted POST request with certain parameters, such as an excessively long string in the indexIDNew parameter or missing the Action parameter, causing the code to enter a vulnerable branch. This flaw is classified under CWE-120 and CWE-119.

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Impact Analysis

Exploitation of this vulnerability can lead to denial of service (DoS) conditions by crashing the affected router. Additionally, it may allow attackers to compromise the confidentiality, integrity, and availability of the system.

Because the vulnerability allows remote exploitation with low privileges and no user interaction, attackers can potentially execute malicious code or disrupt network operations, making it a significant security risk.

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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 HTTP POST requests targeting the endpoint /goform/ConfigExceptAli on UTT HiPER 810G routers, especially those containing unusually long strings in parameters such as indexIDNew.'}, {'type': 'paragraph', 'content': 'A practical detection method involves capturing network traffic and searching for POST requests to /goform/ConfigExceptAli with potentially malicious payloads that could trigger the buffer overflow.'}, {'type': 'list_item', 'content': 'Use network packet capture tools like tcpdump or Wireshark to filter HTTP POST requests to /goform/ConfigExceptAli.'}, {'type': 'list_item', 'content': "Example tcpdump command: tcpdump -i <interface> -A 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)' | grep '/goform/ConfigExceptAli'"}, {'type': 'list_item', 'content': 'Use curl or similar tools to test the endpoint with crafted inputs to verify if the system is vulnerable.'}] [2]

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Mitigation Strategies

Immediate mitigation steps include restricting access to the vulnerable endpoint /goform/ConfigExceptAli by implementing network-level controls such as firewall rules to block unauthorized or external access.

Since no known countermeasures or patches are currently available, it is recommended to replace the affected UTT HiPER 810G device with a secure alternative.

Additionally, monitor the device for unusual behavior or crashes that may indicate exploitation attempts.

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