CVE-2018-12257 : Vulnerability Insights and Analysis

A vulnerability has been identified on Momentum Axel 720P 5.1.8 devices that allows an authenticated root user to upgrade firmware remotely using a custom image.

Understanding CVE-2018-12257

This CVE involves an Authenticated Custom Firmware Upgrade via DNS Hijacking on Momentum Axel 720P 5.1.8 devices.

What is CVE-2018-12257?

An authenticated root user with CLI access can remotely upgrade firmware to a custom image by exploiting a lack of SSL validation when changing nameservers in /etc/resolv.conf to the attacker's server.

The Impact of CVE-2018-12257

Attackers can serve an expected HTTPS response containing new firmware for the device to download.

Technical Details of CVE-2018-12257

This section provides more technical insights into the vulnerability.

Vulnerability Description

The vulnerability allows an authenticated root user to upgrade firmware remotely using a custom image.

Affected Systems and Versions

Momentum Axel 720P 5.1.8 devices are affected by this vulnerability.

Exploitation Mechanism

Lack of SSL validation when changing nameservers in /etc/resolv.conf to the attacker's server enables the exploit.

Mitigation and Prevention

Protecting systems from CVE-2018-12257 is crucial for maintaining security.

Immediate Steps to Take

Disable CLI access for root users if not necessary.
Implement SSL validation for DNS changes to prevent hijacking.

Long-Term Security Practices

Regularly update firmware and software to patch vulnerabilities.
Conduct security audits and penetration tests to identify and address weaknesses.

Patching and Updates

Apply patches provided by the device manufacturer to address this vulnerability.