A vulnerability in the pfe-chassisd Chassis Manager (CMLC) daemon of Juniper Networks Junos OS allows an attacker to cause a Denial of Service (DoS) to the EX4300 when specific valid broadcast packets create a broadcast storm condition when received on the me0 interface of the EX4300 Series device. A reboot of the device is required to restore service. Continued receipt of these valid broadcast packets will create a sustained Denial of Service (DoS) against the device.

Affected releases are Juniper Networks Junos OS:

• 16.1 versions above and including 16.1R1 prior to 16.1R7-S5;
• 17.1 versions prior to 17.1R3;
• 17.2 versions prior to 17.2R3;
• 17.3 versions prior to 17.3R3-S2;
• 17.4 versions prior to 17.4R2;
• 18.1 versions prior to 18.1R3;
• 18.2 versions prior to 18.2R2.

The following minimal configuration is required:

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue was seen during production usage.

This issue has been assigned CVE-2019-0046 .
 

The following software releases have been updated to resolve this specific issue: 16.1R7-S5, 17.1R3, 17.2R3, 17.3R3-S2, 17.4R2, 18.1R3, 18.2R2, 18.3R1, and all subsequent releases.

This issue is being tracked as PR 1329430 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/ .
 

There are no viable workarounds for this issue.
 

• 2019-07-10: Initial Publication

• 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-2019-0046 at cve.mitre.org