Important: systemd

Issue Overview:

An allocation of memory without limits, that could result in the stack clashing with another memory region, was discovered in systemd-journald when a program with long command line arguments calls syslog. A local attacker may use this flaw to crash systemd-journald or escalate privileges.(CVE-2018-16864)

It was discovered that systemd-network does not correctly keep track of a buffer size when constructing DHCPv6 packets. This flaw may lead to an integer underflow that can be used to produce an heap-based buffer overflow. A malicious host on the same network segment as the victim’s one may advertise itself as a DHCPv6 server and exploit this flaw to cause a Denial of Service or potentially gain code execution on the victim’s machine.(CVE-2018-15688)

An allocation of memory without limits, that could result in the stack clashing with another memory region, was discovered in systemd-journald when many entries are sent to the journal socket. A local attacker, or a remote one if systemd-journal-remote is used, may use this flaw to crash systemd-journald or execute code with journald privileges.(CVE-2018-16865)

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 to update your system.

New Packages:

aarch64:  
    systemd-219-57.amzn2.0.8.aarch64  
    systemd-libs-219-57.amzn2.0.8.aarch64  
    systemd-devel-219-57.amzn2.0.8.aarch64  
    systemd-sysv-219-57.amzn2.0.8.aarch64  
    systemd-python-219-57.amzn2.0.8.aarch64  
    libgudev1-219-57.amzn2.0.8.aarch64  
    libgudev1-devel-219-57.amzn2.0.8.aarch64  
    systemd-journal-gateway-219-57.amzn2.0.8.aarch64  
    systemd-networkd-219-57.amzn2.0.8.aarch64  
    systemd-resolved-219-57.amzn2.0.8.aarch64  
    systemd-debuginfo-219-57.amzn2.0.8.aarch64  
  
i686:  
    systemd-219-57.amzn2.0.8.i686  
    systemd-libs-219-57.amzn2.0.8.i686  
    systemd-devel-219-57.amzn2.0.8.i686  
    systemd-sysv-219-57.amzn2.0.8.i686  
    systemd-python-219-57.amzn2.0.8.i686  
    libgudev1-219-57.amzn2.0.8.i686  
    libgudev1-devel-219-57.amzn2.0.8.i686  
    systemd-journal-gateway-219-57.amzn2.0.8.i686  
    systemd-networkd-219-57.amzn2.0.8.i686  
    systemd-resolved-219-57.amzn2.0.8.i686  
    systemd-debuginfo-219-57.amzn2.0.8.i686  
  
src:  
    systemd-219-57.amzn2.0.8.src  
  
x86_64:  
    systemd-219-57.amzn2.0.8.x86_64  
    systemd-libs-219-57.amzn2.0.8.x86_64  
    systemd-devel-219-57.amzn2.0.8.x86_64  
    systemd-sysv-219-57.amzn2.0.8.x86_64  
    systemd-python-219-57.amzn2.0.8.x86_64  
    libgudev1-219-57.amzn2.0.8.x86_64  
    libgudev1-devel-219-57.amzn2.0.8.x86_64  
    systemd-journal-gateway-219-57.amzn2.0.8.x86_64  
    systemd-networkd-219-57.amzn2.0.8.x86_64  
    systemd-resolved-219-57.amzn2.0.8.x86_64  
    systemd-debuginfo-219-57.amzn2.0.8.x86_64  

Additional References

Red Hat: CVE-2018-15688, CVE-2018-16864, CVE-2018-16865

Mitre: CVE-2018-15688, CVE-2018-16864, CVE-2018-16865