CVE-2018-0016 Explained : Impact and Mitigation

A kernel crash or remote code execution vulnerability in Junos OS due to crafted CLNP datagrams.

Understanding CVE-2018-0016

What is CVE-2018-0016?

Receipt of specially crafted CLNP datagrams in Junos OS can lead to a kernel crash or remote code execution.

The Impact of CVE-2018-0016

CVSS Score: 9.8 (Critical)
Attack Vector: Network
Confidentiality Impact: High
Integrity Impact: High
Availability Impact: High
Privileges Required: None
Scope: Unchanged
User Interaction: None
No known malicious exploitation reported.

Technical Details of CVE-2018-0016

Vulnerability Description

Junos OS devices are vulnerable to kernel crashes or remote code execution when receiving specific CLNP datagrams.

Affected Systems and Versions

Junos OS 15.1 versions before 15.1F5-S3, 15.1F6-S8, 15.1F7, 15.1R5
Junos OS 15.1X49 versions before 15.1X49-D60
Junos OS 15.1X53 versions before 15.1X53-D66, 15.1X53-D233, 15.1X53-D471

Exploitation Mechanism

The vulnerability occurs when devices with 'clns-routing' or ES-IS configured receive specific CLNP datagrams.

Mitigation and Prevention

Immediate Steps to Take

Apply software releases: 15.1F5-S3, 15.1F6-S8, 15.1F7, 15.1R5, 15.1X49-D60, 15.1X53-D66, 15.1X53-D233, 15.1X53-D471, 16.1R1, and later
Limit CLNP access via access lists or firewall filters

Long-Term Security Practices

Regularly update Junos OS to the latest version
Implement network segmentation and access controls

Patching and Updates

Ensure all affected systems are updated to Junos OS 16.1R1 or subsequent releases.