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2020-10 Security Bulletin: Junos OS and Junos OS Evolved: MACsec delay protection fails to drop/discard delayed MACsec packets (CVE-2020-1674)

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Article ID: JSA11071 SECURITY_ADVISORIES Last Updated: 14 Oct 2020Version: 1.0
Product Affected:
This issue affects Junos OS 16.1, 17.2, 17.3, 17.4, 18.1, 18.2, 18.3, 18.4, 19.1, 19.2, 19.3, 19.4, 20.1. This issue also affects all versions of Junos OS Evolved.
Problem:

Juniper Networks Junos OS and Junos OS Evolved fail to drop/discard delayed MACsec packets (e.g. delayed by more than 2 seconds). Per the specification, called the "bounded receive delay", there should be no replies to delayed MACsec packets. Any MACsec traffic delayed more than 2 seconds should be dropped and late drop counters should increment. Without MACsec delay protection, an attacker could exploit the delay to spoof or decrypt packets.

This issue affects:

Juniper Networks Junos OS:

  • 16.1 versions prior to 16.1R7-S8;
  • 17.2 versions prior to 17.2R3-S4;
  • 17.3 versions prior to 17.3R3-S8, 17.3R3-S9;
  • 17.4 versions prior to 17.4R2-S11, 17.4R3-S2;
  • 18.1 versions prior to 18.1R3-S11;
  • 18.2 versions prior to 18.2R3-S5;
  • 18.3 versions prior to 18.3R2-S4, 18.3R3-S3;
  • 18.4 versions prior to 18.4R1-S7, 18.4R2-S5, 18.4R3-S3;
  • 19.1 versions prior to 19.1R3-S2;
  • 19.2 versions prior to 19.2R1-S5, 19.2R3;
  • 19.3 versions prior to 19.3R2-S3, 19.3R3;
  • 19.4 versions prior to 19.4R1-S2, 19.4R2-S1, 19.4R3;
  • 20.1 versions prior to 20.1R1-S2, 20.1R2.

Juniper Networks Junos OS Evolved:

  • all versions prior to 19.4R3-EVO;
  • 20.1 versions prior to 20.1R2-EVO.

This issue does not affect Junos OS versions prior to 16.1R1.
 

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-2020-1674.
 

Solution:

The following software releases have been updated to resolve this specific issue:

  • Junos OS 16.1R7-S8, 17.2R3-S4, 17.3R3-S8, 17.3R3-S9, 17.4R2-S11, 17.4R3-S2, 18.1R3-S11, 18.2R3-S5, 18.3R2-S4, 18.3R3-S3, 18.4R1-S7, 18.4R2-S5, 18.4R3-S3, 19.1R3-S2, 19.2R1-S5, 19.2R3, 19.3R2-S3, 19.3R3, 19.4R1-S2, 19.4R2-S1, 19.4R3, 20.1R1-S2, 20.1R2, 20.2R1, and all subsequent releases.
     
  • Junos OS Evolved 19.4R3-EVO, 20.1R2-EVO, 20.2R1-EVO, and all subsequent releases.


This issue is being tracked as 1503010.
 

Workaround:
There are no viable workarounds for this issue.
 
Implementation:
Software releases or updates are available for download at https://www.juniper.net/support/downloads/.
 
Modification History:
2020-10-14: Initial Publication

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