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Arch Linux: 201808-6 High Severity: Linux-Zen Denial Of Service

The package linux-zen before version 4.17.11-1 is vulnerable to denial of service. . Arch Linux Security Advisory ASA-201808-6 ======================================== Severity: High Date : 2018-08-08 CVE-ID : CVE-2018-5390 Package : linux-zen Type : denial of service Remote : Yes Link : https://security.archlinux.org/AVG-749 Summary ====== The package linux-zen before version 4.17.11-1 is vulnerable to denial of service. Resolution ========= Upgrade to 4.17.11-1. # pacman -Syu "linux-zen> =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 ========= https://www.kb.cert.org/vuls/id/962459 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/ https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/ https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/ https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/ https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/ https://security.archlinux.org/CVE-2018-5390 . Arch Linux Security Notification ASA-202308-7: Critical risk denial of service vulnerability detected inlinux-ultimate package. Immediate update advised.. Arch Linux, linux-zen, denial of service. . LinuxSecurity.com Team

Aug 08, 2018 ArchLinux