Overview
In this blog post, we will delve into the details of a critical vulnerability that has been identified in Tenda FH451 1.0.0.9. This vulnerability, which has been designated as CVE-2025-7795, affects the function fromP2pListFilter of the file /goform/P2pListFilter, and opens up potential for a stack-based buffer overflow attack. This issue is significant due to the widespread use of Tenda FH451 and the severity of the vulnerability, which could lead to a system compromise or data leakage if exploited.
Vulnerability Summary
CVE ID: CVE-2025-7795
Severity: Critical (CVSS: 8.8)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
Tenda FH451 | 1.0.0.9
How the Exploit Works
This vulnerability stems from an insufficient bounds check in the handling of the ‘page’ argument in the fromP2pListFilter function. An attacker can exploit this vulnerability by sending a specially crafted request with an oversized ‘page’ argument. This leads to a buffer overflow condition, allowing the attacker to execute arbitrary code or cause a denial of service.
Conceptual Example Code
Here is a simplified, conceptual example demonstrating how an attacker may exploit this vulnerability.
POST /goform/P2pListFilter HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
page=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...In this example, the ‘page’ argument is filled with an excessive amount of ‘A’s, which could overflow the stack buffer and lead to potential execution of arbitrary code.
Remediation
Tenda has acknowledged the vulnerability and released a patch to address this issue. Users are strongly advised to update their Tenda FH451 firmware to the latest version to mitigate this vulnerability. In cases where immediate patching is not feasible, deploying a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can act as a temporary measure to detect and block exploit attempts. However, these are temporary solutions and cannot completely eliminate the vulnerability, so applying the vendor’s patch should be a priority.