CVE-2019-19495 : What You Need to Know

Technicolor TC7230 STEB 01.25's web interface is vulnerable to DNS rebinding, allowing remote attackers to manipulate the cable modem and gain external access to a root shell.

Understanding CVE-2019-19495

The vulnerability in the Technicolor TC7230 STEB 01.25 exposes the device to potential exploitation by malicious actors.

What is CVE-2019-19495?

The Technicolor TC7230 STEB 01.25's web interface is susceptible to DNS rebinding, enabling a remote attacker to customize the cable modem using JavaScript on a victim's web browser. This manipulation allows the attacker to modify the cable modem to forward the internal TELNET server, providing external access to a root shell.

The Impact of CVE-2019-19495

Exploitation of this vulnerability can lead to unauthorized access to the cable modem's internal TELNET server, compromising the device's security and potentially allowing attackers to take control of the system.

Technical Details of CVE-2019-19495

The following technical details outline the specifics of this CVE.

Vulnerability Description

The vulnerability in the Technicolor TC7230 STEB 01.25's web interface allows remote attackers to execute JavaScript code on a victim's browser, enabling them to reconfigure the cable modem and gain access to the internal TELNET server.

Affected Systems and Versions

Product: Technicolor TC7230 STEB 01.25
Vendor: Technicolor
Version: Not applicable

Exploitation Mechanism

The attacker can exploit this vulnerability by tricking a user into visiting a malicious website that executes JavaScript code, enabling the attacker to reconfigure the cable modem and gain access to the internal TELNET server.

Mitigation and Prevention

Protecting against CVE-2019-19495 requires immediate action and long-term security measures.

Immediate Steps to Take

Disable remote access to the cable modem's web interface if not required.
Regularly monitor network traffic for any suspicious activities.
Implement strong firewall rules to restrict unauthorized access.

Long-Term Security Practices

Keep the cable modem's firmware up to date to patch known vulnerabilities.
Educate users about the risks of visiting untrusted websites and clicking on suspicious links.

Patching and Updates

Check for firmware updates provided by Technicolor to address the vulnerability.
Apply patches promptly to ensure the security of the cable modem.