Overview
A critical vulnerability has been identified in Tenda FH1202 version 1.2.0.14(408). This vulnerability, classified as a stack-based buffer overflow, can lead to potential system compromise or data leakage. It is particularly alarming because it can be exploited remotely, increasing the potential range and impact of attacks. The vulnerability is linked to the function fromNatlimit in the file /goform/Natlimit, and the manipulation of the argument ‘page’ can trigger it.
This discovery is of high interest to both security teams and potential threat actors due to its severity and the widespread use of Tenda products. Therefore, it is crucial that users understand the nature of this vulnerability and take immediate steps to mitigate any potential risks.
Vulnerability Summary
CVE ID: CVE-2025-7529
Severity: Critical, CVSS Severity Score: 8.8
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: Potential system compromise and data leakage
Affected Products
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Product | Affected Versions
Tenda FH1202 | 1.2.0.14(408)
How the Exploit Works
The vulnerability lies in the ‘fromNatlimit’ function in the file ‘/goform/Natlimit’. When the ‘page’ argument is manipulated, it can cause a stack-based buffer overflow. This means that an attacker can flood the buffer with more data than it can handle, which can lead to the overwriting of adjacent memory locations. Consequently, this can allow an attacker to execute arbitrary code and potentially compromise the system or leak data.
Conceptual Example Code
An attacker might exploit the vulnerability through a malicious HTTP request such as:
POST /goform/Natlimit HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "page": "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA..." }In this conceptual example, the “page” argument is overloaded with an excessive amount of ‘A’ characters, triggering the buffer overflow.
Mitigation
Users of Tenda FH1202 are strongly urged to apply the vendor-provided patch for this vulnerability. In the interim, the use of a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as temporary mitigation. Regularly updating and patching systems is crucial in maintaining a strong cybersecurity posture. Additionally, monitoring system logs for unusual activities can aid in early detection of potential exploitation attempts.