Overview
The Common Vulnerabilities and Exposures (CVE) system has identified a critical vulnerability in TOTOLINK T6 4.1.5cu.748_B20211015. This vulnerability, classified as CVE-2025-7460, is of paramount importance due to its potential to compromise systems and lead to data leakage. It affects the HTTP POST Request Handler component of TOTOLINK T6, specifically the function setWiFiAclRules. The vulnerability can be exploited remotely and has already been disclosed to the public, raising its threat level and making it a matter of urgency for users of the affected software to address.
Vulnerability Summary
CVE ID: CVE-2025-7460
Severity: Critical, CVSS score of 8.8
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise and data leakage
Affected Products
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Product | Affected Versions
TOTOLINK T6 | 4.1.5cu.748_B20211015
How the Exploit Works
The vulnerability in TOTOLINK T6 arises from a buffer overflow condition in the function setWiFiAclRules of the file /cgi-bin/cstecgi.cgi. This is triggered when the ‘mac’ argument is manipulated during an HTTP POST Request. A malicious actor can exploit this vulnerability by sending a specially crafted HTTP POST request that contains an excessively long ‘mac’ value. This overflow of data can cause the system to behave unpredictably, potentially allowing the attacker to execute arbitrary code and gain unauthorized access to the system.
Conceptual Example Code
Below is a conceptual example of how the vulnerability might be exploited:
POST /cgi-bin/cstecgi.cgi HTTP/1.1
Host: target.example.com
Content-Type: application/json
{
"setWiFiAclRules": {
"mac": "00:00:00:00:00:00/../../../*[payload of excessive length]"
}
}In the above example, the ‘mac’ field is filled with an excessively long payload, causing a buffer overflow and potentially triggering the vulnerability.
Mitigation Guidance
To mitigate this vulnerability, users are urged to apply the patch provided by the vendor as soon as possible. In the absence of a patch or in the interim period before it can be applied, users can use a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as temporary mitigation against potential attacks. However, these are stop-gap measures and do not provide a permanent solution to the vulnerability.