Impact Analysis

This vulnerability can lead to severe security risks including unauthorized control over the router, potential interception or manipulation of network traffic, and exposure of connected devices.

Attackers could modify the router's firmware to maintain persistent access or launch further attacks within the network, compromising confidentiality, integrity, and availability of data and services.

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Executive Summary

The Shenzhen Kangda Xin Intelligent Network Technology Company's router, model DR300 version 2.1.2.121, has hardcoded login credentials and telnet enabled by default on both WAN and LAN interfaces. These security flaws allow attackers to gain unauthorized access to the device.

Once accessed, attackers can read and write to the router's memory, modify the firmware stored in flash memory, inspect active network connections, and view devices currently connected to the router.

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Detection Guidance

This vulnerability involves hardcoded login credentials and telnet enabled by default on WAN and LAN interfaces of the Shenzhen Kangda Xin Intelligent Network Technology Company DR300 router, version 2.1.2.121.

To detect this vulnerability on your network or system, you can scan for devices with telnet ports open (typically port 23) on both WAN and LAN interfaces.

• Use a network scanning tool such as nmap to identify devices with port 23 open: nmap -p 23 <target-ip-range>
• Attempt to connect via telnet to the identified devices to check for hardcoded credentials: telnet <device-ip>
• Check router firmware version if accessible to confirm if it matches version 2.1.2.121.

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Mitigation Strategies

Immediate mitigation steps include disabling telnet access on both WAN and LAN interfaces to prevent unauthorized access.

Change or remove any hardcoded login credentials if possible, or replace the affected router with a secure model.

Restrict network access to the router management interfaces to trusted hosts only.

Monitor network traffic for unusual activity that may indicate exploitation attempts.

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