Important: systemd

Issue Overview:

Large syslogd messages sent to journald can cause stack corruption, causing journald to crash. The version of systemd on Amazon Linux 2 is not vulnerable to privilege escalation in this case. (CVE-2018-16864)

Large native messages to journald can cause stack corruption, leading to possible local privilege escalation.(CVE-2018-16865)

Please note, if you have systemd-journald-remote configured over http, then you could be open to remote escalation on previous versions of the systemd package. The systemd-journald-remote service is not installed by default on Amazon Linux 2, and when installed and enabled, the default configuration is to use https. (CVE-2018-16865)

An out-of-bounds read in journald, triggered by a specially crafted message, can be used to leak information through the journal file (CVE-2018-16866)

Affected Packages:

systemd

Note:

This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.

Issue Correction:
Run yum update systemd then reboot your instance, to update your system.

New Packages:

aarch64:  
    systemd-219-57.amzn2.0.7.aarch64  
    systemd-libs-219-57.amzn2.0.7.aarch64  
    systemd-devel-219-57.amzn2.0.7.aarch64  
    systemd-sysv-219-57.amzn2.0.7.aarch64  
    systemd-python-219-57.amzn2.0.7.aarch64  
    libgudev1-219-57.amzn2.0.7.aarch64  
    libgudev1-devel-219-57.amzn2.0.7.aarch64  
    systemd-journal-gateway-219-57.amzn2.0.7.aarch64  
    systemd-networkd-219-57.amzn2.0.7.aarch64  
    systemd-resolved-219-57.amzn2.0.7.aarch64  
    systemd-debuginfo-219-57.amzn2.0.7.aarch64  
  
i686:  
    systemd-219-57.amzn2.0.7.i686  
    systemd-libs-219-57.amzn2.0.7.i686  
    systemd-devel-219-57.amzn2.0.7.i686  
    systemd-sysv-219-57.amzn2.0.7.i686  
    systemd-python-219-57.amzn2.0.7.i686  
    libgudev1-219-57.amzn2.0.7.i686  
    libgudev1-devel-219-57.amzn2.0.7.i686  
    systemd-journal-gateway-219-57.amzn2.0.7.i686  
    systemd-networkd-219-57.amzn2.0.7.i686  
    systemd-resolved-219-57.amzn2.0.7.i686  
    systemd-debuginfo-219-57.amzn2.0.7.i686  
  
src:  
    systemd-219-57.amzn2.0.7.src  
  
x86_64:  
    systemd-219-57.amzn2.0.7.x86_64  
    systemd-libs-219-57.amzn2.0.7.x86_64  
    systemd-devel-219-57.amzn2.0.7.x86_64  
    systemd-sysv-219-57.amzn2.0.7.x86_64  
    systemd-python-219-57.amzn2.0.7.x86_64  
    libgudev1-219-57.amzn2.0.7.x86_64  
    libgudev1-devel-219-57.amzn2.0.7.x86_64  
    systemd-journal-gateway-219-57.amzn2.0.7.x86_64  
    systemd-networkd-219-57.amzn2.0.7.x86_64  
    systemd-resolved-219-57.amzn2.0.7.x86_64  
    systemd-debuginfo-219-57.amzn2.0.7.x86_64  

Additional References

Red Hat: CVE-2018-16864, CVE-2018-16865, CVE-2018-16866

Mitre: CVE-2018-16864, CVE-2018-16865, CVE-2018-16866