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2018-01 Security Bulletin: Junos OS: MAC move limit configured to drop traffic may forward traffic. (CVE-2018-0005)

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Article ID: JSA10833 SECURITY_ADVISORIES Last Updated: 10 Jan 2018Version: 2.0
Product Affected:
This issue affects Junos OS 14.1X53, 15.1, 15.1X53.
Problem:

QFX and EX Series switches configured to drop traffic when the MAC move limit is exceeded will forward traffic instead of dropping traffic. This can lead to denials of services or other unintended conditions.

Affected releases are Juniper Networks Junos OS:

  • 14.1X53 versions prior to 14.1X53-D40;
  • 15.1X53 versions prior to 15.1X53-D55;
  • 15.1 versions prior to 15.1R7.

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-2018-0005.

Solution:

The following software releases have been updated to resolve this specific issue: 14.1X53-D40, 15.1X53-D55, 15.1X53-D60, 16.1R1, and all subsequent releases.

This issue is being tracked as 1105372 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:
To decrease the risk of seeing the issue, increase the MAC move limit rate on the device, or to work around the issue until a fix can be taken, remove the MAC move limit from the devices running configuration. These actions may introduce other possible unintended consequences to customer environments and should be evaluated carefully on a case-by-case basis and are not complete mitigations.
Implementation:
Software Releases, patches and updates are available at https://www.juniper.net/support/downloads/.
Modification History:
2018-01-10: Initial publication
CVSS Score:
7.4 (CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H)
Severity Level:
High
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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