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CVE-2025-7077: Critical Buffer Overflow Vulnerability in Shenzhen Libituo Technology LBT-T300-T310

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Overview

The CVE-2025-7077 is a critical vulnerability identified in Shenzhen Libituo Technology’s LBT-T300-T310 up to version 2.2.3.6. This flaw is of significant concern due to its severity and the potential impact it can have on the integrity, availability, and confidentiality of the affected system. The vulnerability resides in the config_3g_para function of the /appy.cgi file, and the exploitation can be performed remotely, which raises the risk factor for systems running the affected software version.

Vulnerability Summary

CVE ID: CVE-2025-7077
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

Shenzhen Libituo Technology LBT-T300-T310 | Up to 2.2.3.6

How the Exploit Works

The vulnerability stems from insufficient boundary checks when handling the username_3g/password_3g arguments in the config_3g_para function. This oversight allows an attacker to input a larger than expected value, causing a buffer overflow. Buffer overflow conditions can lead to various outcomes, including the ability for an attacker to execute arbitrary code, leading to a potential system compromise or data leakage.

Conceptual Example Code

An instance of the vulnerability might be exploited with a crafted HTTP POST request similar to the following:

POST /appy.cgi HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
username_3g=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...&password_3g=<password>

The “A”s in the username_3g field represent an excessively long string designed to overflow the buffer. The exact length and content would depend on the specificities of the vulnerable system’s architecture, stack layout, and the exploit’s objectives.

Mitigation Guidance

It’s recommended to apply the vendor patch as soon as it becomes available. In the absence of a vendor patch, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation method. These systems should be configured to monitor and block unexpected or malicious data sent to the affected config_3g_para function.

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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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