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CVE-2025-6144: Critical Buffer Overflow Vulnerability in TOTOLINK EX1200T

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Overview

A critical vulnerability, identified as CVE-2025-6144, has been discovered in TOTOLINK EX1200T version 4.1.2cu.5232_B20210713. This vulnerability presents a significant risk to any organization or individual using the affected device, as it can be exploited remotely, providing attackers with the potential to compromise systems and leak sensitive data. The vulnerability lies in the HTTP POST Request Handler, specifically within the /boafrm/formSysCmd file which can be manipulated to trigger a buffer overflow condition. Given the severity of this vulnerability, it demands immediate attention and remediation.

Vulnerability Summary

CVE ID: CVE-2025-6144
Severity: Critical (CVSS 8.8)
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 EX1200T | 4.1.2cu.5232_B20210713

How the Exploit Works

The vulnerability lies within an unknown functionality of the /boafrm/formSysCmd file of the HTTP POST Request Handler component. Attackers can manipulate the argument ‘submit-url’, which can lead to a buffer overflow condition. A buffer overflow essentially means that more data is written to a block of allocated memory than it can hold, causing the excess data to overflow into adjacent locations. If an attacker can control this overflow, it can be used to overwrite critical control data and manipulate the software’s execution.

Conceptual Example Code

Here is a conceptual example of an HTTP POST request that could potentially exploit this vulnerability:

POST /boafrm/formSysCmd HTTP/1.1
Host: target.example.com
submit-url=<malicious_payload>

In this example, “ would be a specially crafted string designed to overflow the buffer and potentially take control of the system.

Mitigation and Recommendations

The best course of action to mitigate this vulnerability is to apply the vendor-provided patch as soon as possible. If for any reason this is not feasible, a temporary mitigation could be the utilization of a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) to detect and block attempts to exploit this vulnerability. However, these are only temporary measures and do not fix the underlying issue, so applying the vendor patch should be the ultimate goal.
Always remember to keep your systems up-to-date and regularly monitor for any new vulnerabilities and patches. In the world of cybersecurity, staying vigilant and proactive is the key to maintaining robust security.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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