Overview
A critical vulnerability, labelled as CVE-2025-6149, has been identified in the TOTOLINK A3002R 4.0.0-B20230531.1404. This vulnerability lies in an unknown function of the file /boafrm/formSysLog in the HTTP POST Request Handler component. It poses a significant threat as it can lead to a buffer overflow, potentially compromising systems or leading to data leakage. Given its critical nature and the fact that this exploit has been disclosed to the public, immediate attention and mitigation is required.
Vulnerability Summary
CVE ID: CVE-2025-6149
Severity: Critical (8.8 CVSS score)
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
TOTOLINK A3002R | 4.0.0-B20230531.1404
How the Exploit Works
The vulnerability is triggered when a malicious user manipulates the ‘submit-url’ argument in the HTTP POST request. This manipulation leads to a buffer overflow in the /boafrm/formSysLog file of the HTTP POST Request Handler component. Buffer overflows occur when more data is written into a block of memory, or buffer, than it can hold. This overflow of data can overwrite adjacent memory, leading to erratic program behavior, system crashes, or potential execution of malicious code.
Conceptual Example Code
Here’s a simplified, conceptual example of how the vulnerability might be exploited. This is a mock HTTP POST request containing a malicious payload that leads to the buffer overflow.
POST /boafrm/formSysLog HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
submit-url=%2Fboafrm%2FformSysLog&malicious_payload=AAAA...[continues for a very long time]In the above example, the ‘malicious_payload’ is a long string of ‘A’s that exceeds the buffer’s capacity, causing an overflow.
Recommended Mitigation
Users are advised to apply the vendor patch as soon as it becomes available. In the meantime, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used as a temporary mitigation method to monitor and block any suspicious activities. Moreover, frequent system and data backups can be invaluable in the event of a successful exploit.