Overview
The CVE-2025-6939 is a critical vulnerability discovered in TOTOLINK A3002RU’s 3.0.0-B20230809.1615 version. This vulnerability resides in an unknown functionality within the /boafrm/formWlSiteSurvey file of the HTTP POST Request Handler. By manipulating the ‘submit-url’ argument, an attacker can cause a buffer overflow, leading to potential system compromise or data leakage. Given the severity of this vulnerability and its potential to be exploited remotely, immediate attention and mitigation are demanded.
Vulnerability Summary
CVE ID: CVE-2025-6939
Severity: Critical (8.8 CVSS Severity Score)
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: System compromise and potential data leakage
Affected Products
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Product | Affected Versions
TOTOLINK A3002RU | 3.0.0-B20230809.1615
How the Exploit Works
The vulnerability lies in the HTTP POST Request Handler of the TOTOLINK A3002RU device, specifically within the /boafrm/formWlSiteSurvey file. An attacker can exploit this vulnerability by sending a malicious HTTP POST request with a manipulated ‘submit-url’ argument. This manipulation causes a buffer overflow in the system, which can result in arbitrary code execution. Consequently, an attacker can potentially compromise the system and possibly leak sensitive data.
Conceptual Example Code
Here’s a conceptual example of how the vulnerability might be exploited:
POST /boafrm/formWlSiteSurvey HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
submit-url=http://malicious.example.com&...other parameters...In this example, the attacker replaces the ‘submit-url’ value with a malicious URL. This leads to a buffer overflow in the system, potentially allowing the execution of arbitrary code and leading to system compromise or data leakage.
Mitigation
Users of the affected TOTOLINK A3002RU version are advised to apply the vendor patch immediately. If the vendor patch is not yet available, a temporary mitigation strategy could be to implement a Web Application Firewall (WAF) or Intrusion Detection System (IDS) to block malicious HTTP POST requests. However, this is a temporary solution and the vendor patch should be applied as soon as it becomes available to fully mitigate the vulnerability.