2016-04 Security Bulletin: Junos: RPD cores on receiving a crafted L2VPN family BGP update (CVE-2016-1270)Product Affected:This issue can affect any product or platform running Junos OS with family BGP based L2VPN and/or VPLS configured
Problem:Upon receipt of a specially crafted BGP ‘family l2vpn’ UPDATE message, the Junos OS rpd daemon will crash and restart. Receipt of a constant stream of these crafted updates could lead to an extended denial of service.This issue only affects BGP based L2VPN and VPLS configurations. No other configurations are affected.

The issue is not applicable to BGP Route Reflectors (RR).Note that this issue can only be triggered from inside a customer’s network. MPLS labels are not usually exchanged outside the protected network, and are usually only received from a PE or RR in the same network.This issue was found during internal product security testing.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-2016-1270.
Solution:The following software releases have been updated to resolve this specific issue: Junos OS 12.1X44-D60, 12.1X46-D45, 12.1X47-D30, 12.3R9, 12.3X48-D20, 13.2R7, 13.2X51-D40, 13.3R6, 14.1R4, 14.2R2, 14.2R3, and all subsequent releases.This issue is being tracked as PR 1041189 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:While no single workaround is effective in all cases, the risk associated with this issue can be mitigated by applying access lists or firewall filters to limit access to the router’s BGP port from trusted peers only.
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:
2016-04-13: Initial publication

Related Links:CVSS Score:7.5 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Risk Level:High
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: