The Junos OS kernel crashes after processing a specific incoming packet to the out of band management interface (such as fxp0, me0, em0, vme0) destined for another address.

By continuously sending this type of packet, an attacker can repeatedly crash the kernel causing a sustained Denial of Service.

Affected releases are Juniper Networks Junos OS:

• 17.2 versions prior to 17.2R1-S7, 17.2R3;
• 17.3 versions prior to 17.3R3-S3;
• 17.4 versions prior to 17.4R1-S4, 17.4R2;
• 17.2X75 versions prior to 17.2X75-D110;
• 18.1 versions prior to 18.1R2.

This issue was seen during production usage.

This issue has been assigned CVE-2019-0011 .

The following software releases have been updated to resolve this specific issue: Junos OS 17.2R1-S7, 17.2R3, 17.2X75-D110, 17.3R3-S3, 17.4R1-S4, 17.4R2, 18.1R2, 18.2R1, 18.2X75-D5, and all subsequent releases.
This issue is being tracked as PR 1318556 which is visible on the Customer Support website.
Note: Juniper SIRT's policy is not to evaluate releases which are beyond End of Engineering (EOE) or End of Life (EOL).

Software Releases, patches and updates are available at https://www.juniper.net/support/downloads/ .

Apply a firewall filter on the management interface which permits only the necessary traffic on management interface to the device's local address, such as SNMP, SSH, or other management traffic and drops everything else.

• 2019-01-09: Initial Publication.
• 2019-01-10: Minor edit on the Solution section.
• 2019-01-22: Minor update on the Solution section.

• KB16613: Overview of the Juniper Networks SIRT Quarterly Security Bulletin Publication Process [juniper.net]
• KB16765: In which releases are vulnerabilities fixed? [juniper.net]
• KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories [juniper.net]
• Report a Security Vulnerability - How to Contact the Juniper Networks Security Incident Response Team
• CVE-2019-0011 at cve.mitre.org
• https://kb.juniper.net/JSA10911 [juniper.net]