2016-07 Security Bulletin: Junos: Crafted UDP packet can lead to kernel crash on 64-bit platforms (CVE-2016-1263)Product Affected:This issue can affect any product or platform running 64-bit Junos OS
Problem:Receipt of a specifically crafted UDP packet destined to an interface IP address of a Junos OS device with a 64-bit platform may result in a kernel crash. This issue only affects systems running 64-bit Junos OS on a 64-bit routing engine (RE). 32-bit systems are unaffected by this vulnerability.According to KB25803, customers can confirm 64-bit Junos OS software via the ‘show version detail‘ command:
user@JUNOS> show version detail | match 64
JUNOS 64-bit Kernel Software Suite [14.1R7.4]
JUNOS 64-bit Runtime Software Suite [14.1R7.4]
Note: All SRX Series services gateways currently utilize 32-bit Junos OS for routing engine processing and are therefore not vulnerable to this issue.Only packets able to reach the RE through existing edge and control plane firewall filters, destined to the device itself, can trigger this issue. Junos OS is not vulnerable to transit UDP traffic.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-2016-1263.
Solution:The following software releases have been updated to resolve this specific issue: Junos OS 12.1X46-D45, 12.1X46-D51, 12.1X47-D35, 12.3X48-D30, 13.3R9-S1, 13.3R10, 14.1R7, 14.2R6, 15.1F2-S5, 15.1F4-S2, 15.1F5, 15.1R2-S3, 15.1R3, 15.1X49-D40, and all subsequent releases.Note: Junos OS 12.1X46-D50 does not have this fix!This issue is being tracked as PR 1142939 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:Limit the exploitable attack surface of critical infrastructure networking equipment. Use access lists or firewall filters to limit access to the device via UDP 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 publication2016-07-14: Added method of confirming 64-bit RE2016-07-15: Noted that all SRX Series devices currently utilize 32-bit Junos OS
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 Assessment:Information for how Juniper Networks uses CVSS can be found at KB 16446 “Common Vulnerability Scoring System (CVSS) and Juniper’s Security Advisories.”