CVE-2018-0031 Explained : Impact and Mitigation

Juniper Networks Junos OS is affected by a vulnerability that allows specially crafted UDP packets over MPLS to bypass stateless IP firewall rules.

Understanding CVE-2018-0031

This CVE involves a specific issue in Junos OS that could potentially lead to a denial of service attack.

What is CVE-2018-0031?

Receiving specially crafted UDP/IP packets over MPLS can bypass a stateless firewall filter, potentially contributing to a denial of service attack.

The Impact of CVE-2018-0031

Crafted UDP packets can evade IP firewall filter rules
High volume of UDP packets may lead to a denial of service attack

Technical Details of CVE-2018-0031

This section provides detailed technical information about the vulnerability.

Vulnerability Description

Crafted UDP packets over MPLS can bypass stateless IP firewall rules
Only affects transit UDP/IP packets over MPLS

Affected Systems and Versions

Junos OS versions prior to 12.1X46-D76, 12.3R12-S10, 12.3X48-D66, 12.3X48-D70, 14.1X53-D47, 15.1F6-S10, 15.1R4-S9, 15.1R6-S6, 15.1R7, 15.1X49-D131, 15.1X49-D140, 15.1X53-D59, 15.1X53-D67, 15.1X53-D233, 15.1X53-D471, 15.1X53-D490, 16.1R3-S8, 16.1R4-S9, 16.1R5-S4, 16.1R6-S3, 16.1R7, 16.2R1-S6, 16.2R2-S5, 16.2R3, 17.1R1-S7, 17.1R2-S7, 17.1R3, 17.2R1-S6, 17.2R2-S4, 17.2R3, 17.2X75-D100, 17.3R1-S4, 17.3R2-S2, 17.3R3, 17.4R1-S3, 17.4R2, 18.1R2, 18.2X75-D5

Exploitation Mechanism

Crafted UDP packets must adhere to a specific structure to evade IP firewall filter rules
Only affects transit UDP/IP packets over MPLS

Mitigation and Prevention

Learn how to mitigate and prevent the CVE-2018-0031 vulnerability.

Immediate Steps to Take

Update to the fixed software releases

Long-Term Security Practices

Regularly update Junos OS to the latest versions
Monitor network traffic for any suspicious UDP packet activity

Patching and Updates

Apply the following software releases to resolve the issue: 12.1X46-D76, 12.3X48-D66, 12.3X48-D70, 14.1X53-D47, 15.1F6-S10, 15.1R4-S9, 15.1R6-S6, 15.1R7, 15.1X49-D131, 15.1X49-D140, 15.1X53-D233, 15.1X53-D471, 15.1X53-D490, 15.1X53-D59, 15.1X53-D67, 16.1R3-S8, 16.1R4-S9, 16.1R5-S4, 16.1R6-S3, 16.1R7, 16.2R1-S6, 16.2R2-S5, 16.2R3, 17.1R1-S7, 17.1R2-S7, 17.1R3, 17.2R1-S6, 17.2R2-S4, 17.2R3, 17.2X75-D100, 17.3R1-S4, 17.3R2-S2, 17.3R3, 17.4R1-S3, 17.4R2, 18.1R2, 18.2R1, 18.2X75-D5, and all subsequent releases.