CVE-2018-0057 : Vulnerability Insights and Analysis

In a Broadband Edge (BBE) environment, on MX Series and M120/M320 platforms, a vulnerability in Junos OS allows DHCP subscribers to be assigned requested IP addresses, potentially leading to denial of service or information disclosure.

Understanding CVE-2018-0057

This CVE involves a vulnerability in Junos OS that affects specific versions and allows malicious DHCP subscribers to exploit the system.

What is CVE-2018-0057?

This CVE refers to a flaw in Junos OS that enables DHCP subscribers to obtain requested IP addresses, potentially causing denial of service or unauthorized information disclosure.

The Impact of CVE-2018-0057

The vulnerability could be exploited by malicious DHCP subscribers to create duplicate IP address assignments, leading to denial of service for legitimate users or unauthorized information disclosure.

Technical Details of CVE-2018-0057

This section provides detailed technical information about the vulnerability.

Vulnerability Description

In a BBE environment, subscribers logging in with DHCP Option 50 can receive requested IP addresses, bypassing MAC to IP address bindings, potentially leading to IP address assignment spoofing.

Affected Systems and Versions

Junos OS versions prior to 15.1R7-S2, 15.1R8
Junos OS versions prior to 16.1R4-S12, 16.1R7-S2, 16.1R8
Junos OS versions prior to 16.2R2-S7, 16.2R3
Junos OS versions prior to 17.1R2-S9, 17.1R3
Junos OS versions prior to 17.2R1-S7, 17.2R2-S6, 17.2R3
Junos OS versions prior to 17.3R2-S4, 17.3R3
Junos OS versions prior to 17.4R2
Junos OS versions prior to 18.1R2-S3, 18.1R3

Exploitation Mechanism

The vulnerability allows DHCP subscribers to request specific IP addresses, potentially causing denial of service or unauthorized information disclosure.

Mitigation and Prevention

Steps to address and prevent the exploitation of this vulnerability.

Immediate Steps to Take

Apply the provided software releases to resolve the issue.

Long-Term Security Practices

Regularly update Junos OS to the latest versions.
Monitor DHCP activities for unusual IP address assignments.

Patching and Updates

Update to the following software releases: 15.1R7-S2, 15.1R8, 16.1R4-S12, 16.1R7-S2, 16.1R8, 16.2R2-S7, 16.2R3, 17.1R2-S9, 17.1R3, 17.2R1-S7, 17.2R2-S6, 17.2R3, 17.3R2-S4, 17.3R3, 17.4R2, 18.1R2-S3, 18.1R3, 18.2R1, 18.3R1, and subsequent releases.