Overview
A critical vulnerability has been identified in Tenda i22 1.0.0.3(4687), a widely used router. The vulnerability, tracked as CVE-2025-9297, affects the formWeixinAuthInfoGet function of the /goform/wxportalauth file. This flaw allows potential attackers to manipulate the ‘Type’ argument, leading to a stack-based buffer overflow. This can be exploited remotely and may result in a system compromise or data leakage, posing a significant risk to the confidentiality, integrity, and availability of user data and systems.
Vulnerability Summary
CVE ID: CVE-2025-9297
Severity: Critical, CVSS 8.8
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise and potential data leakage
Affected Products
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Product | Affected Versions
Tenda i22 | 1.0.0.3(4687)
How the Exploit Works
The vulnerability stems from improper input validation in the formWeixinAuthInfoGet function. When processing an argument labeled ‘Type,’ the function fails to adequately check the size of the user-supplied data. This allows an attacker to provide an excessively long string, causing the program to overwrite the stack’s memory. This could allow an attacker to execute arbitrary code with the privileges of the affected service, leading to potential unauthorized access, information disclosure, or denial of service.
Conceptual Example Code
Here is a conceptual example of how the vulnerability might be exploited using a maliciously crafted HTTP request:
POST /goform/wxportalauth HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
Type=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...[Long string of 'A's causing buffer overflow]The above example demonstrates a buffer overflow attack, where the ‘Type’ parameter is supplied with a long string of ‘A’s, which exceeds the buffer’s limit, leading to the overflow.
Mitigation Guidance
The most effective mitigation for this vulnerability is to apply the vendor-supplied patch. Until the patch can be applied, it is recommended to use a Web Application Firewall (WAF) or Intrusion Detection System (IDS) to detect and block attempts to exploit this vulnerability. Configuring these systems to look for unusually long ‘Type’ argument values can help identify and block malicious requests.
