By manipulating TCP timestamps within a TCP session to a reachable listening port, it may be possible for an attacker to trigger a persistent buffer/socket resource exhaustion denial of service DoS attack. Normally, a networked device will time out a session after a number of unsuccessful retransmission events, occurring at increasing intervals. However, in this case, a crafted sequence of TCP packets will cause the device to not try to retransmit, allowing the attacker to create sockets that will be long-lived without the need to maintain state on them. 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-2016-1269 .
The following software releases have been updated to resolve this specific issue: Junos OS 12.1X44-D60, 12.1X46-D40, 12.1X47-D30, 12.3R11, 12.3X48-D20, 13.2R9, 13.2X51-D39, 13.2X51-D40, 13.3R8, 14.1R6, 14.1X53-D30, 14.2R4-S1, 14.2R5, 15.1R2, 15.1X49-D30, 16.1R1, and all subsequent releases. This issue is being tracked as PR 1073571 and is visible on the Customer Support website. KB16765 [juniper.net] - "In which releases are vulnerabilities fixed?" describes which release vulnerabilities are fixed as per our End of Engineering and End of Life support policies.
Use access lists or firewall filters to limit access to the router via TCP 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.
2016-04-13: Initial publication