Overview
A critical vulnerability, referred to as CVE-2025-7423, has been identified in Tenda O3V2 1.0.0.12(3880). This vulnerability is particularly concerning due to its potential impact on the integrity of the affected system, and the fact that it can be exploited remotely. The risks include potential system compromise or data leakage, posing a serious threat to organizations that have not yet applied the vendor patch or implemented a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary mitigation method.
Vulnerability Summary
CVE ID: CVE-2025-7423
Severity: Critical (8.8/10)
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
Tenda O3V2 | 1.0.0.12(3880)
How the Exploit Works
The vulnerability lies in the file /goform/setWrlFilterList, particularly in the formWifiMacFilterSet function of the httpd component. The vulnerability is triggered when an attacker manipulates the argument macList. This manipulation leads to a stack-based buffer overflow, which can then be exploited to execute arbitrary code or cause a denial of service, depending on the nature of the overflow and the data being processed.
Conceptual Example Code
An illustration of how this vulnerability might be exploited using an HTTP request might look something like this:
POST /goform/setWrlFilterList HTTP/1.1
Host: targetIPaddress
Content-Type: application/x-www-form-urlencoded
macList=aa:bb:cc:dd:ee:ff%00[arbitrary_code_or_overflow_trigger]In this example, ‘aa:bb:cc:dd:ee:ff’ represents a MAC address, and the ‘%00’ represents a null byte that begins the buffer overflow. ‘[arbitrary_code_or_overflow_trigger]’ represents the malicious code or the trigger for the buffer overflow.
Remember, this is a conceptual example and should not be used for malicious purposes. Always follow ethical practices when dealing with cybersecurity vulnerabilities.