CVE-2018-0019 : Exploit Details and Defense Strategies

A weakness has been identified in the Junos OS SNMP MIB-II subagent daemon (mib2d) that could potentially lead to a denial of service (DoS) situation for the SNMP subsystem.

Understanding CVE-2018-0019

This CVE affects Juniper Networks' Junos OS versions and involves a vulnerability in the SNMP MIB-II subagent daemon (mib2d).

What is CVE-2018-0019?

The vulnerability in the mib2d process could be exploited by a network-connected attacker to crash the process, resulting in a DoS scenario for the SNMP subsystem.

The Impact of CVE-2018-0019

The vulnerability could disrupt SNMP-based network monitoring but will not affect routing, switching, or firewall functionalities.

Technical Details of CVE-2018-0019

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The weakness in the mib2d process allows an attacker to crash it, leading to a DoS condition for the SNMP subsystem.

Affected Systems and Versions

Juniper Networks Junos OS versions up to 17.1 are affected by this vulnerability.

Exploitation Mechanism

The vulnerability can be exploited by an attacker connected to the network.

Mitigation and Prevention

Steps to address and prevent the exploitation of CVE-2018-0019.

Immediate Steps to Take

Disable SNMP if not required as it is disabled by default on Junos OS devices.
Utilize edge filtering with source-address validation, access control lists (ACLs), and SNMPv3 authentication to restrict access.

Long-Term Security Practices

Regularly update Junos OS to the patched versions provided by Juniper Networks.

Patching and Updates

Update to the following software releases to resolve the issue: 12.3R12-S7, 12.3R13, 12.3X48-D65, 14.1R9, 14.1X53-D130, 15.1F2-S20, 15.1F6-S10, 15.1R7, 15.1X49-D130, 15.1X53-D233, 15.1X53-D471, 15.1X53-D472, 15.1X53-D58, 15.1X53-D66, 16.1R5-S3, 16.1R7, 16.1X65-D47, 16.1X70-D10, 16.2R1-S6, 16.2R2-S5, 16.2R3, 17.1R2-S6, 17.1R3, 17.2R1, and subsequent releases.