CVE-2020-1666 Explained : Impact and Mitigation

This CVE involves a vulnerability in Juniper Networks Junos OS Evolved that fails to log out an active CLI session when the console cable is disconnected, potentially allowing unauthorized access.

Understanding CVE-2020-1666

This vulnerability could permit a malicious attacker physical access to resume a previous session and potentially gain administrative privileges.

What is CVE-2020-1666?

The 'log-out-on-disconnect' option in Juniper Networks Junos OS Evolved does not properly terminate active CLI sessions when the console cable is unplugged.

The Impact of CVE-2020-1666

CVSS Base Score: 6.6 (Medium Severity)
Attack Vector: Physical
Confidentiality Impact: High
Integrity Impact: High
Availability Impact: High
An attacker with local access could exploit this to gain unauthorized privileges.

Technical Details of CVE-2020-1666

A detailed overview of the technical aspects of the vulnerability.

Vulnerability Description

The issue affects Junos OS Evolved versions after 18.4R1-EVO but before 20.2R1-EVO.

Affected Systems and Versions

Affected: Junos OS Evolved versions < 20.2R1-EVO
Unaffected: Junos OS Evolved versions !< 18.4R1-EVO

Exploitation Mechanism

No known malicious exploitation has been reported by Juniper SIRT.

Mitigation and Prevention

Guidance on addressing and preventing the CVE.

Immediate Steps to Take

Update to fixed software releases (e.g., Junos OS Evolved 20.2R1-EVO or later).
Restrict physical console access to trusted administrators.

Long-Term Security Practices

Regularly review and update system configurations and access controls.
Conduct security awareness training to educate users on protecting sensitive systems.

Patching and Updates

Juniper Networks advises upgrading to Junos OS Evolved 20.2R1-EVO or subsequent versions to resolve this issue.