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2017-04 Security Bulletin: EX Series: Crafted IPv6 NDP packet causing a slow memory leak on EX Series Switches (CVE-2017-2315)

  [JSA10781] Show Article Properties


Product Affected:
This issue can affect any EX Series Ethernet Switch with IPv6 enabled
Problem:
A vulnerability in IPv6 processing has been discovered that may allow a specially crafted IPv6 Neighbor Discovery (ND) packet destined to an EX Series Ethernet Switches to cause a slow memory leak.  A malicious network-based packet flood of these crafted IPv6 NDP packets may eventually lead to resource exhaustion and a denial of service.

Due to the way the EX Series implements IPv6 forwarding along with ICMPv6 redirects, this issue is specific to the EX Series Ethernet Switches.  Additionally, this issue only affects EX Series Ethernet Switches with IPv6 enabled.  No other products or platforms are affected by this vulnerability.

Juniper SIRT is not aware of any malicious exploitation of this vulnerability, however, the issue has been seen in a production network.

This issue has been assigned CVE-2017-2315.
 
Solution:
The following software releases have been updated to resolve this specific issue: Junos OS 12.3R12-S4, 12.3R13, 13.3R10, 14.1R8-S3, 14.1R9, 14.1X53-D12, 14.1X53-D40, 14.1X55-D35, 14.2R6-S4, 14.2R7-S6, 14.2R8, 15.1R5, 16.1R3, 16.2R1-S3, 16.2R2, 17.1R1, and all subsequent releases.

Note that while the EX Series Ethernet Switches may not support all fixed releases, the software change to resolve this issue was checked into Junos OS common code, and was fixed in all supported releases based on our published End of Engineering and End of Life support policies.

This issue is being tracked as PR 1206593 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:
Use access lists or firewall filters to limit ICMPv6 traffic destined to the switch only from trusted hosts.
 
Implementation:
How to obtain fixed software:
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:
2017-04-12: Initial publication

Related Links:
CVSS Score:
5.3 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
Risk Level:
Medium
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."