2016-07 Security Bulletin: Junos: Kernel crash with crafted ICMP packet (CVE-2016-1277)Product Affected:This issue can affect any product or platform running Junos OS configured with a GRE or IPIP tunnel.
Problem:On Junos devices with a GRE or IPIP tunnel configured (i.e., devices with a gr- or ip- interface), a specifically crafted ICMP packet can cause a kernel panic resulting in a denial of service condition.Knowledge of network specific information is required to craft such an ICMP packet. Receipt of such a packet on any interface on the device can cause a crash.Devices that do not have any gr- or ip- interfaces are unaffected by this issue.This issue only affects IPv4. IPv6 is unaffected by this issue.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-2016-1277.
Solution:The following software releases have been updated to resolve this specific issue: Junos OS 12.1X46-D50, 12.1X47-D40, 12.3X48-D30, 13.3R9, 14.1R8, 14.1X53-D40, 14.2R6, 15.1F6, 15.1R3, 15.1X49-D40 and all subsequent releases.This issue is being tracked as PR 1159454 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 access to the router via ICMP only from trusted hosts.In addition to the recommendations listed above, it is good security practice to limit the exploitable attack surface of critical infrastructure networking equipment. Use access lists or firewall filters to limit all administrative access to the router only from trusted, administrative networks or 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:
2016-07-13: Initial publication2016-07-18: IPv6 unaffected note added.
Related Links:CVSS Score:5.9 (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H)
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.”