Overview
A critical vulnerability, identified as CVE-2025-7806, has been discovered in Tenda FH451 1.0.0.9. This remote exploit revolves around the manipulation of the ‘Go/page’ argument in the function fromSafeClientFilter of the file ‘/goform/SafeClientFilter’ leading to a stack-based buffer overflow. This vulnerability poses a significant threat to the integrity, availability, and confidentiality of the affected system, potentially leading to a system compromise or data leakage. It is crucial for IT administrators and security professionals to understand the nature of this vulnerability and take the necessary steps to mitigate its impact.
Vulnerability Summary
CVE ID: CVE-2025-7806
Severity: Critical – CVSS Score 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
Tenda FH451 | 1.0.0.9
How the Exploit Works
The vulnerability arises from an uncontrolled buffer in the function fromSafeClientFilter. An attacker can manipulate the ‘Go/page’ argument when sending a request to the ‘/goform/SafeClientFilter’ file. This action results in a buffer overflow in the stack, which could allow the attacker to execute arbitrary code in the context of the application.
Conceptual Example Code
Here’s an example of how an attacker might exploit this vulnerability. Please note that this is a conceptual example and does not represent an actual exploit code:
POST /goform/SafeClientFilter HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
Go/page=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA... (continues to fill the buffer)In the above example, the ‘Go/page’ parameter is filled with an excessive amount of ‘A’ characters, causing the stack buffer to overflow.
Mitigation
Tenda has released a patch to address this issue, and it is strongly recommended to apply this patch as soon as possible. If this is not an immediate option, the use of a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation by monitoring and blocking suspicious traffic patterns that may indicate an attempt to exploit this vulnerability. However, these are temporary solutions and will not provide complete protection against the vulnerability. As such, updating to the patched version remains the best course of action.