This issue can affect any SRX Series Services Gateway running Junos OS 10.4, 11.4, 12.1, or 12.1X44
On SRX Series devices where Protocol-Independent Multicast (PIM) is enabled, certain PIM packets subject to Network Address Translation (NAT) may cause the Flow Daemon (flowd) to crash. Repeated crashes of flowd can represent a sustained denial of service condition on SRX Series devices.
This issue only occurs in a NAT environment. This issue cannot be triggered by PIM packets sent directly to the SRX.
Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
No other Juniper Networks products or platforms are affected by this issue.
All Junos OS software releases built on or after 2013-06-20 have fixed this specific issue. Releases containing the fix specifically include: 10.4S14, 11.4R8, 12.1R7, 12.1X44-D15, and all subsequent releases (i.e. all releases built after 12.1X44-D15).
Customers can confirm the build date of any Junos OS release by issuing the command 'show version detail'.
This issue is being tracked as PR 842253 and is visible on the Customer Support website. A Customer Support login is required.
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 known workaround exists for this issue.
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.