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2019-04 Security Bulletin: Junos OS: EX4300-MP Series: IP transit traffic can reach the control plane via loopback interface. (CVE-2019-0041)

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Article ID: JSA10933 SECURITY_ADVISORIES Last Updated: 10 Apr 2019Version: 1.0
Product Affected:
This issue affects Junos OS 18.2. Affected platforms: EX4300-MP Series.
Problem:

On EX4300-MP Series devices with any lo0 filters applied, transit network traffic may reach the control plane via loopback interface (lo0). The device may fail to forward such traffic.

This issue affects Juniper Networks Junos OS 18.2 versions prior to 18.2R1-S2, 18.2R2 on EX4300-MP Series.

This issue does not affect any other EX series devices.

This issue requires filters configured on lo0.

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

This issue was found during internal product security testing or research.

This issue has been assigned CVE-2019-0041.

Solution:

The following software releases have been updated to resolve this specific issue: 18.2R1-S2, 18.2R2, 18.3R1, and all subsequent releases.

This issue is being tracked as PR 1379328 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:

Removing lo0 filters would mitigate this issue.

Implementation:
Software Releases, patches and updates are available at https://www.juniper.net/support/downloads/.
Modification History:
  • 2019-04-10: Initial Publication.

 

CVSS Score:
6.5 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L)
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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