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             AUSCERT External Security Bulletin Redistribution

 JSA10938 - 2019-07 Security Bulletin: Junos OS: EX4300 Series: Denial of
          Service upon receipt of large number of specific valid
             packets on management interface. (CVE-2019-0046)
                               12 July 2019


        AusCERT Security Bulletin Summary

Product:           Juniper EX4300 Series
Publisher:         Juniper Networks
Operating System:  Juniper
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-0046  

Original Bulletin: 

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2019-07 Security Bulletin: Junos OS: EX4300 Series: Denial of Service upon 
receipt of large number of specific valid packets on management interface. 

Article ID:   JSA10938

Last Updated: 10 Jul 2019

Version:      4.0

Product Affected:
This issue affects Junos OS 16.1, 17.1, 17.2, 17.3, 17.4, 18.1, 18.2 on EX4300

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

Affected releases are Juniper Networks Junos OS:

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

The following minimal configuration is required:

set interfaces me0

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).


There are no viable workarounds for this issue.

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

Modification History:

  o 2019-07-10: Initial Publication

Related Links:

  o KB16613: Overview of the Juniper Networks SIRT Quarterly Security Bulletin
    Publication Process

  o KB16765: In which releases are vulnerabilities fixed

  o KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's Security

  o Report a Security Vulnerability - How to Contact the Juniper Networks
    Security Incident Response Team

  o CVE-2019-0046 at cve.mitre.org

CVSS Score:
6.5 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Risk Level:

Risk Assessment:
Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common
Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."

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