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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. (CVE-2019-0046)

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Article ID: JSA10938 SECURITY_ADVISORIES Last Updated: 10 Jul 2019Version: 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 Series.
Problem:

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:

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.
 

Solution:

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).
 

Workaround:

There are no viable workarounds for this issue.
 

Implementation:
Software Releases, patches and updates are available at https://www.juniper.net/support/downloads/.
 
Modification History:
  • 2019-07-10: Initial Publication
CVSS Score:
6.5 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Severity Level:
Medium
Severity 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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