Comtrend ADSL Remote Code Execution Scanner

Comtrend ADSL is widely utilized in residential and business environments to provide broadband internet access via DSL technology. It is commonly preferred by Internet Service Providers for its reliability and ease of use. The device includes features such as built-in Wi-Fi, advanced routing capabilities, and various security settings tailored to manage home and office networks. Key users include households, small to medium businesses, and individuals seeking efficient internet connectivity solutions. This product primarily aims to facilitate fast internet speeds and reliable network performance for various applications. Comtrend ADSL routers, such as the CT-5367 C01_R12 model, are equipped with interfaces that allow for remote configuration and monitoring.

The Remote Code Execution (RCE) is a critical vulnerability that allows attackers to execute arbitrary code on the targeted system. It exploits flaws in the router's software, permitting unauthorized execution of commands. This particular vulnerability is serious because it can be used remotely by attackers without the need for authentication. The presence of RCE in Comtrend ADSL routers could allow malicious actors to gain control over the device, leading to unauthorized access and manipulation. Typically, RCE vulnerabilities are exploited through inadequately secured interfaces that provide control over system functionalities. Detection and prevention of such vulnerabilities are vital to maintaining the security integrity of network devices.

This vulnerability stems from the router's telnet interface, which allows unchecked command execution. The endpoint 'password.cgi' exposes authentication credentials to unauthenticated users, making the system susceptible. Attackers can leverage this by sending crafted requests to the vulnerable endpoint. Successful exploitation requires forming requests that meet certain conditions outlined in the router’s software. The 'password.cgi' endpoint inadvertently reveals admin, support, and user passwords, thus providing an entry point for remote code execution. Vigilant monitoring of network traffic and endpoint access are crucial in preventing exploitation.

Exploiting this vulnerability could lead to full router compromise, enabling attackers to alter configurations, intercept data, or use the device for launching further attacks. Compromised routers may become part of botnet networks, thus contributing to larger scale malicious activities. Users might experience unauthorized network downtime, data breaches, or financial losses if sensitive information is intercepted. Such vulnerabilities undermine user trust and can impact service providers' reputations. In the worst cases, they may lead to regulatory compliance breaches due to failed data protection practices.

REFERENCES

• https://www.exploit-db.com/exploits/16275