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2018-04 Security Bulletin: Junos OS: Short MacSec keys may allow man-in-the-middle attacks. (CVE-2018-0021)

  [JSA10854] Show Article Properties


Product Affected:
This issue affects Junos OS 14.1, 14.1X53, 15.1, 15.1X49, 15.1X53, 16.1, 16.2, 17.1.
Problem:

If all 64 digits of the connectivity association name (CKN) key or all 32 digits of the connectivity association key (CAK) key are not configured, all remaining digits will be auto-configured to 0.

Hence, Juniper devices configured with short MacSec keys are at risk to an increased likelihood that an attacker will discover the secret passphrases configured for these keys through dictionary-based and brute-force-based attacks using spoofed packets.

Affected releases are Juniper Networks Junos OS:

  • 14.1 versions prior to 14.1R10, 14.1R9;
  • 14.1X53 versions prior to 14.1X53-D47;
  • 15.1 versions prior to 15.1R4-S9, 15.1R6-S6, 15.1R7;
  • 15.1X49 versions prior to 15.1X49-D100;
  • 15.1X53 versions prior to 15.1X53-D59;
  • 16.1 versions prior to 16.1R3-S8, 16.1R4-S8, 16.1R5;
  • 16.2 versions prior to 16.2R1-S6, 16.2R2;
  • 17.1 versions prior to 17.1R2.

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-2018-0021.

Solution:

The following software releases have been updated to resolve this specific issue: 14.1R9, 14.1X53-D47, 15.1R4-S9, 15.1R6-S6, 15.1R7, 15.1X49-D100, 15.1X53-D59, 16.1R3-S8, 16.1R4-S8, 16.1R5, 16.2R1-S6, 16.2R2, 17.1R2, 17.2R1 and all subsequent releases.

This issue is being tracked as 1251909 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:

Configure all 64 digits of a CKN.

Configure all 32 digits of a CAK.

See the junos task topic macsec for further information.

Implementation:
Software Releases, patches and updates are available at https://www.juniper.net/support/downloads/.
Modification History:
  • 2018-04-11: Initial Publication.
Related Links:
CVSS Score:
8.8 (CVSS:3.0/AV:A/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H)
Risk Level:
High
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."