CVE-2018-0055 : What You Need to Know

A vulnerability in Junos OS could allow a specially crafted DHCPv6 message to cause a crash in the jdhcpd daemon, potentially leading to a denial of service situation.

Understanding CVE-2018-0055

This CVE involves a specific issue in Junos OS versions 15.1 and later that could be exploited by crafted DHCPv6 packets.

What is CVE-2018-0055?

Receipt of a crafted DHCPv6 message targeting a Junos OS device configured as a DHCP server in a BBE environment may crash the jdhcpd daemon.
Continuous receipt of such packets could result in a prolonged denial of service.
Only devices with DHCP services configured are vulnerable.

The Impact of CVE-2018-0055

CVSS Base Score: 6.5 (Medium Severity)
Attack Vector: Adjacent Network
Availability Impact: High
No impact on Confidentiality or Integrity

Technical Details of CVE-2018-0055

This section provides detailed technical information about the vulnerability.

Vulnerability Description

A specially crafted DHCPv6 message can crash the jdhcpd daemon in Junos OS.

Affected Systems and Versions

Versions affected: 15.1, 15.1X49, 15.1X53, 16.1, 16.2, 17.1, 17.2, 17.3, 17.4, 18.1, 18.2, 18.2X75

Exploitation Mechanism

Malicious exploitation has not been reported by Juniper SIRT.

Mitigation and Prevention

Learn how to mitigate and prevent the CVE-2018-0055 vulnerability.

Immediate Steps to Take

Update to the fixed software releases: 15.1R7-S2, 15.1X49-D160, 15.1X53-D235, and more.
Disable DHCP services if not required.

Long-Term Security Practices

Regularly update Junos OS to the latest versions.
Implement network segmentation to limit the impact of potential attacks.

Patching and Updates

Ensure all affected systems are patched with the latest software releases.