CVE-2017-18374 : Exploit Details and Defense Strategies

A vulnerability in the ZyXEL P660HN-T1A v1 TCLinux Fw $7.3.15.0 v001 / 3.40(ULM.0)b31 router distributed by TrueOnline allows unauthorized access and manipulation of router configurations.

Understanding CVE-2017-18374

This CVE identifies a security issue in the ZyXEL router that enables authenticated command injections through preset user accounts.

What is CVE-2017-18374?

The TrueOnline distributor provides the ZyXEL P660HN-T1A v1 TCLinux Fw $7.3.15.0 v001 / 3.40(ULM.0)b31 router with preset user accounts, including a service account with default credentials, leading to potential exploitation for malicious activities.

The Impact of CVE-2017-18374

The vulnerability allows attackers to gain access to the router's web interface, execute authenticated command injections, and modify router settings, posing a significant security risk.

Technical Details of CVE-2017-18374

This section delves into the specifics of the vulnerability.

Vulnerability Description

The ZyXEL P660HN-T1A v1 TCLinux Fw $7.3.15.0 v001 / 3.40(ULM.0)b31 router has two user accounts with preset passwords, including a service account with the username true and password true, enabling unauthorized access and manipulation of router configurations.

Affected Systems and Versions

Product: ZyXEL P660HN-T1A v1 TCLinux Fw $7.3.15.0 v001 / 3.40(ULM.0)b31
Vendor: TrueOnline
Versions: All versions

Exploitation Mechanism

The hardcoded user accounts with default passwords allow attackers to log in to the web interface, perform authenticated command injections, and potentially compromise the router's security.

Mitigation and Prevention

Protecting against CVE-2017-18374 is crucial for maintaining network security.

Immediate Steps to Take

Change default passwords for all user accounts on the ZyXEL router.
Regularly monitor router logs for any suspicious activities.
Implement network segmentation to limit the impact of potential breaches.

Long-Term Security Practices

Conduct regular security audits and penetration testing on network devices.
Educate users on strong password practices and the importance of regular security updates.
Keep abreast of security advisories and patches from the vendor.
Consider implementing additional security measures such as firewall rules and intrusion detection systems.

Patching and Updates

Stay informed about firmware updates and security patches released by ZyXEL.
Promptly apply recommended patches to mitigate the vulnerability and enhance the router's security.