2017-01 Security Bulletin: QFX3500, QFX3600, QFX5100, QFX5200, EX4300 and EX4600: ‘Etherleak’ memory disclosure in Ethernet padding data (CVE-2017-2304)Product Affected:This issue affects QFX3500, QFX3600, QFX5100, QFX5200, EX4300 and EX4600 devices.
Problem:
QFX3500, QFX3600, QFX5100, QFX5200, EX4300 and EX4600 devices do not pad Ethernet packets with zeros, and thus some packets can contain fragments of system memory or data from previous packets.

This issue is also known as ‘Etherleak’ and often detected as CVE-2003-0001.
Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
This issue has been assigned CVE-2017-2304.

Solution:
The following software releases have been updated to resolve this specific issue: Junos OS 14.1X53-D40, 15.1X53-D40, 15.1R2  and all subsequent releases.
This issue is being tracked as PR 1063645 and is visible on the Customer Support website.
KB16765 – “In which releases are vulnerabilities fixed?” describes which release vulnerabilities are fixed as per our End of Engineering and End of Life support policies.

Workaround:
There are no known workarounds to prevent the information leak in Ethernet packets.
It is a 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 QFX device only from trusted, administrative networks or hosts.

Implementation:
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:
2017-01-11: Initial release.

Related Links:CVSS Score:4.3 (CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)
Risk Level:Low
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.”

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