Knowledge Search


×
 

2016-07 Security Bulletin: Junos: mbuf leak when flooding new IPv6 MAC addresses received via VPLS instances (CVE-2016-1275)

  [JSA10750] Show Article Properties


Product Affected:
This issue can affect any product or platform running Junos OS 13.3 or 14.1 (see exceptions below) with VPLS enabled
Problem:
A Junos device with VPLS routing-instances configured on one or more interfaces may be susceptible to an mbuf leak when source and destination MAC addresses of Ethernet frames with the EtherType field of IPv6 (0x86DD) are flooded into the VPLS instance.  The Ethernet frames must be injected directly into a connected interface, limiting exposure to directly connected adjacent networks.

Note that Junos OS 14.1X53 (EX and QFX Series) does not include the vulnerable code and is unaffected by this vulnerability.

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

No other Juniper Networks products or platforms are affected by this issue.

This issue has been assigned CVE-2016-1275.

Solution:
The following software releases have been updated to resolve this specific issue: Junos OS 13.3R9, 14.1R6-S1, 14.1R7, 14.2R1*, 15.1R1*, 15.1F2, 16.1R1*, and all subsequent releases.

This issue is being tracked as PR 1132568 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.

*No release of Junos OS 14.2, 15.1, or 16.1 is vulnerable to this issue.  The issue was resolved prior to FRS (R1).

Workaround:
If EtherType IPv6 MAC addresses are not required, a VPLS flood filter can be applied as follows:
   set firewall family vpls filter fltr term 1 from ether-type ipv6
   set firewall family vpls filter fltr term 1 then discard
   set routing-instances vpls-1 forwarding-options family vpls flood input fltr
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:
Modification History:

2016-07-13: Initial publication

Related Links:
CVSS Score:
6.5 (CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
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."
Acknowledgements: