Stack-Based Buffer Overflow in Tenda WH450 /goform/qossetting

Executive Summary

This vulnerability exists in the Tenda WH450 device, specifically in an unknown function related to the file /goform/qossetting. It involves manipulation of an argument called 'page' that causes a stack-based buffer overflow. This type of vulnerability can be exploited remotely and has been publicly disclosed.

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Impact Analysis

The vulnerability can lead to a stack-based buffer overflow, which may allow an attacker to execute arbitrary code, cause denial of service, or compromise the confidentiality, integrity, and availability of the affected device. Since the attack can be initiated remotely, it poses a significant security risk.

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Compliance Impact

The vulnerability impacts the confidentiality, integrity, and availability of the device, which are core principles in standards like GDPR and HIPAA. Exploitation could lead to unauthorized access or disruption of services, potentially causing non-compliance with these regulations due to compromised data protection and system reliability. However, no specific compliance impact or regulatory guidance is detailed in the provided resources. [3]

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Detection Guidance

This vulnerability can be detected by monitoring HTTP requests to the /goform/qossetting endpoint on Tenda WH450 routers, specifically looking for unusually long or malformed 'page' parameter values that could indicate an exploit attempt. Network intrusion detection systems (NIDS) can be configured to alert on such suspicious requests. Additionally, reviewing router logs for repeated or abnormal access to /goform/qossetting may help detect exploitation attempts. Specific commands depend on your network setup, but for example, using tcpdump or Wireshark to capture HTTP traffic and filter for requests to /goform/qossetting can be useful. 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/qossetting'. [1, 3]

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Mitigation Strategies

Immediate mitigation steps include restricting remote access to the Tenda WH450 router's management interface, especially blocking access to the /goform/qossetting endpoint from untrusted networks. If possible, disable remote management features temporarily. Since no official patches or countermeasures are published, replacing the affected device with a non-vulnerable alternative is recommended. Monitoring for exploit attempts and applying network-level protections such as web application firewalls (WAF) to block malicious requests targeting the 'page' parameter can also help reduce risk. [3]

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