CVE-2017-7964 : Exploit Details and Defense Strategies

Zyxel WRE6505 devices have a default TELNET password of 1234 for the root and admin accounts, making it easier for remote attackers to conduct DNS hijacking attacks by reconfiguring the built-in dnshijacker process.

Understanding CVE-2017-7964

This CVE identifies a security vulnerability in Zyxel WRE6505 devices that allows remote attackers to exploit the default TELNET password.

What is CVE-2017-7964?

The default TELNET password for the root and admin accounts on Zyxel WRE6505 devices is 1234. This vulnerability enables remote attackers to carry out DNS hijacking attacks through reconfiguration of the built-in dnshijacker process.

The Impact of CVE-2017-7964

Remote attackers can easily access the root and admin accounts with the default password, compromising the device's security.
Attackers can exploit this vulnerability to conduct DNS hijacking attacks, potentially leading to unauthorized redirection of network traffic.

Technical Details of CVE-2017-7964

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The default TELNET password of 1234 for the root and admin accounts on Zyxel WRE6505 devices.

Affected Systems and Versions

Product: Zyxel WRE6505
Vendor: Zyxel
Versions: All versions with the default TELNET password

Exploitation Mechanism

Remote attackers exploit the default TELNET password to gain unauthorized access and manipulate the dnshijacker process for DNS hijacking.

Mitigation and Prevention

Protect your systems from CVE-2017-7964 with these mitigation strategies.

Immediate Steps to Take

Change the default TELNET password on Zyxel WRE6505 devices to a strong, unique password.
Disable TELNET access if not required and use secure protocols like SSH.

Long-Term Security Practices

Regularly update firmware and apply security patches provided by Zyxel.
Implement network segmentation and access controls to limit exposure to potential attacks.

Patching and Updates

Stay informed about security advisories from Zyxel and promptly apply patches to address known vulnerabilities.