ASA-201808-4 log original external raw

[ASA-201808-4] linux: denial of service
Arch Linux Security Advisory ASA-201808-4 ========================================= Severity: High Date : 2018-08-08 CVE-ID : CVE-2018-5390 Package : linux Type : denial of service Remote : Yes Link : Summary ======= The package linux before version 4.17.11-1 is vulnerable to denial of service. Resolution ========== Upgrade to 4.17.11-1. # pacman -Syu "linux>=4.17.11-1" The problem has been fixed upstream in version 4.17.11. Workaround ========== None. Description =========== A flaw named SegmentSmack was found in the way the Linux kernel handled specially crafted TCP packets. A remote attacker could use this flaw to trigger time and calculation expensive calls to tcp_collapse_ofo_queue() and tcp_prune_ofo_queue() functions by sending specially modified packets within ongoing TCP sessions which could lead to a CPU saturation and hence a denial of service on the system. Maintaining the denial of service condition requires continuous two-way TCP sessions to a reachable open port, thus the attacks cannot be performed using spoofed IP addresses. Impact ====== A remote attacker is able to saturate the CPU and hence cause a denial of service on the host system by sending specially modified packets within ongoing TCP sessions. References ==========