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2017-07 Security Bulletin: SRX Series: MACsec failure to report errors (CVE-2017-2342)



Article ID: JSA10790 SECURITY_ADVISORIES Last Updated: 12 Jul 2017Version: 1.0
Product Affected:
This issue affects Juniper Networks Junos OS 15.1X49 prior to 15.1X49-D100 on SRX300 series.

MACsec feature on Juniper Networks Junos OS 15.1X49 prior to 15.1X49-D100 on SRX300 series does not report errors when a secure link can not be established. It falls back to an unencrypted link. This can happen when MACsec is configured on ports that are not capable of MACsec or when a secure link can not be established. This can mislead customers into believing that a link is secure.

On SRX 300 series devices, prior to 15.1X49-D100, MACsec was only supported on control and fabric ports of SRX340 and SRX345 devices. SRX300 and and SRX320 did not have any MACsec capable ports. Configuring MACsec on ports that were not MACsec capable would have resulted in this issue.

This issue has been assigned CVE-2017-2342.


The following software releases have been updated to resolve this specific issue:15.1X49-D100 and all subsequent releases.

This issue is being tracked as PR 1244795 and 1261983 and are visible on the Customer Support website.

There are no viable workarounds for this issue.
It is good security practice to limit the exploitable attack surface of critical infrastructure networking equipment. Use access lists or firewall filters to limit access to the device from trusted, administrative networks or hosts.
Security vulnerabilities in Junos are fixed in the next available Maintenance Release of each supported Junos version. In some cases, a Maintenance Release is not planned to be available in an appropriate time-frame. For these cases, Service Releases are made available in order to be more timely. Security Advisory and Security Notices will indicate which Maintenance and Service Releases contain fixes for the issues described. Upon request to JTAC, customers will be provided download instructions for a Service Release. Although Juniper does not provide formal Release Note documentation for a Service Release, a list of "PRs fixed" can be provided on request.
Modification History:
  • 2017-07-12: Initial Publication.


CVSS Score:
8.1 (CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N)
Severity Level:
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."
The Juniper SIRT would like to acknowledge and thank Eric Haszlakiewicz and Thor Simon of Two Sigma Investments, LP

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