CVE-2018-0061 Explained : Impact and Mitigation

A security vulnerability in the telnetd service on Junos OS allows remote unauthenticated users to exploit the system by causing excessive CPU usage, potentially impacting overall system performance.

Understanding CVE-2018-0061

This CVE identifies a denial of service vulnerability in the telnetd service on Junos OS, affecting various Juniper Networks products and versions.

What is CVE-2018-0061?

This CVE pertains to a security flaw in the telnetd service on Junos OS, enabling remote unauthenticated users to create high CPU usage, potentially leading to system performance issues.

The Impact of CVE-2018-0061

The vulnerability can result in a denial of service condition, affecting the availability of the system and potentially causing performance degradation.

Technical Details of CVE-2018-0061

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The flaw in the telnetd service on Junos OS allows remote unauthenticated users to trigger high CPU usage, impacting system performance.

Affected Systems and Versions

Junos OS versions 12.1X46-D81, 12.3R12-S11, 12.3X48-D80, 15.1R7, 15.1X49-D150, 15.1X49-D160, 15.1X53-D59, 15.1X53-D68, 15.1X53-D235, 15.1X53-D495, 16.1R4-S12, 16.1R6-S6, 16.1R7, 16.2R2-S7, 16.2R3, 17.1R2-S9, 17.1R3, 17.2R2-S6, 17.2R3, 17.2X75-D100, 17.3R2-S4, 17.3R3, 17.4R1-S5, 17.4R2, 18.2X75-D5 are affected.

Exploitation Mechanism

The vulnerability can be exploited remotely by sending specially crafted requests to the telnetd service, leading to excessive CPU usage.

Mitigation and Prevention

Learn how to mitigate and prevent the impact of CVE-2018-0061.

Immediate Steps to Take

Disable the telnet service to prevent exploitation of the vulnerability.

Long-Term Security Practices

Regularly update Junos OS to the latest patched versions.
Implement network segmentation and access controls to limit exposure to potential threats.

Patching and Updates

Update to the following software releases to address the vulnerability: 12.1X46-D81, 12.3R12-S11, 12.3X48-D80, 15.1R7, 15.1X49-D150, 15.1X49-D160, 15.1X53-D235, 15.1X53-D495, 15.1X53-D59, 15.1X53-D68, 16.1R4-S12, 16.1R6-S6, 16.1R7, 16.2R2-S7, 16.2R3, 17.1R2-S9, 17.1R3, 17.2R2-S6, 17.2R3, 17.2X75-D100, 17.2X75-D110, 17.3R2-S4, 17.3R3, 17.4R1-S5, 17.4R2, 18.1R1, 18.1R2, 18.2R1, 18.2X75-D5, and all subsequent releases.