Overview
In today’s ever-evolving cybersecurity landscape, a new critical vulnerability has been identified in TOTOLINK N600R v4.3.0cu.7866_B2022506. Labeled as CVE-2025-46060, this vulnerability poses a significant risk to the integrity, confidentiality, and availability of the systems that use the affected device. It is particularly alarming as it allows a remote attacker to execute arbitrary code, potentially leading to system compromise or data leakage. Organizations that use the affected TOTOLINK N600R firmware version should prioritize mitigation measures to prevent potential exploits.
Vulnerability Summary
CVE ID: CVE-2025-46060
Severity: Critical (9.8 CVSS score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise or data leakage
Affected Products
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Product | Affected Versions
TOTOLINK N600R | v4.3.0cu.7866_B2022506
How the Exploit Works
The exploit takes advantage of a buffer overflow vulnerability in the UPLOAD_FILENAME component of the TOTOLINK N600R firmware. A buffer overflow occurs when a program writes more data to a buffer than it’s capable of holding. In this case, an attacker sends an overly large filename to the UPLOAD_FILENAME component. The overflow of data can overwrite adjacent memory locations, causing the program to crash or execute arbitrary code.
Conceptual Example Code
Here is a conceptual example of how this vulnerability could be exploited:
POST /upload HTTP/1.1
Host: target.example.com
Content-Type: multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW
------WebKitFormBoundary7MA4YWxkTrZu0gW
Content-Disposition: form-data; name="file"; filename="a_long_filename_that_causes_buffer_overflow.txt"
Content-Type: text/plain
malicious_payload
------WebKitFormBoundary7MA4YWxkTrZu0gW--In this example, the filename is excessively long, causing a buffer overflow in the UPLOAD_FILENAME component. The malicious payload could be any code that the attacker wants the system to execute.
Mitigation
To mitigate this vulnerability, users of affected versions should immediately apply the patch provided by the vendor. If the patch cannot be applied immediately, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation by blocking or alerting on attempts to exploit this vulnerability. Always remember that these are just temporary solutions and should not replace the permanent fix provided by the vendor.
Conclusion
In conclusion, the CVE-2025-46060 vulnerability is a critical risk that requires immediate attention. By understanding the nature of the threat and taking swift and appropriate action, organizations can protect their systems from potential compromise. With the ever-present danger of cyber threats, maintaining a robust security posture is not just an option, but a necessity.