ALAS2-2018-1050


Amazon Linux 2 Security Advisory: ALAS-2018-1050
Advisory Release Date: 2018-08-06 19:11 Pacific
Severity: Critical
References: CVE-2018-5390 

Issue Overview:

Linux kernel versions 4.9+ can be forced to make very expensive calls to tcp_collapse_ofo_queue() and tcp_prune_ofo_queue() for every incoming packet which can lead to a denial of service. An attacker can induce a denial of service condition by sending specially modified packets within ongoing TCP sessions. 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. ( https://www.kb.cert.org/vuls/id/962459 )


Affected Packages:

kernel


Issue Correction:
Run yum update kernel and reboot your instance to update your system.

New Packages:
src:
    kernel-4.14.59-68.43.amzn2.src

x86_64:
    kernel-4.14.59-68.43.amzn2.x86_64
    kernel-headers-4.14.59-68.43.amzn2.x86_64
    kernel-debuginfo-common-x86_64-4.14.59-68.43.amzn2.x86_64
    perf-4.14.59-68.43.amzn2.x86_64
    perf-debuginfo-4.14.59-68.43.amzn2.x86_64
    python-perf-4.14.59-68.43.amzn2.x86_64
    python-perf-debuginfo-4.14.59-68.43.amzn2.x86_64
    kernel-tools-4.14.59-68.43.amzn2.x86_64
    kernel-tools-devel-4.14.59-68.43.amzn2.x86_64
    kernel-tools-debuginfo-4.14.59-68.43.amzn2.x86_64
    kernel-devel-4.14.59-68.43.amzn2.x86_64
    kernel-debuginfo-4.14.59-68.43.amzn2.x86_64