CVE-2018-0044 : Exploit Details and Defense Strategies

Remote unauthenticated access may be possible on Juniper NFX Series devices due to an insecure SSHD configuration in Juniper Device Manager (JDM) and host OS when passwords are left empty.

Understanding CVE-2018-0044

This CVE involves a vulnerability in the SSHD configuration on Juniper NFX Series devices that allows remote unauthenticated access.

What is CVE-2018-0044?

The vulnerability arises from the SSHD configuration in Juniper Device Manager (JDM) and host OS on NFX Series devices when passwords are empty.

The Impact of CVE-2018-0044

CVSS Score: 9.8 (Critical)
Attack Vector: Network
Confidentiality, Integrity, and Availability Impact: High
No privileges required for exploitation

Technical Details of CVE-2018-0044

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability allows remote unauthenticated access on Juniper NFX Series devices due to an insecure SSHD configuration in JDM and host OS.

Affected Systems and Versions

Platforms: NFX Series
Product: Junos OS
Vendor: Juniper Networks
Affected Version: 18.1 prior to 18.1R4

Exploitation Mechanism

Exploitation occurs when user or system accounts have blank or empty passwords configured on JDM or host OS.

Mitigation and Prevention

Steps to address and prevent the CVE-2018-0044 vulnerability.

Immediate Steps to Take

Ensure all accounts on JDM and host OS have passwords configured.
Set the PermitEmptyPasswords option to 'no' in the /etc/ssh/sshd_config file.

Long-Term Security Practices

Regularly review and update SSHD configurations.
Enforce strong password policies for all accounts.

Patching and Updates

Update to fixed versions of Junos OS: 18.1R4, 18.2R1, or later releases.