[USN-3855-1] systemd vulnerabilities

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==========================================================================
Ubuntu Security Notice USN-3855-1
January 11, 2019

systemd vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in systemd.

Software Description:
- systemd: system and service manager

Details:

It was discovered that systemd-journald allocated variable-length buffers
for certain message fields on the stack. A local attacker could
potentially exploit this to cause a denial of service, or execute
arbitrary code. (CVE-2018-16864)

It was discovered that systemd-journald allocated variable-length arrays
of objects representing message fields on the stack. A local attacker
could potentially exploit this to cause a denial of service, or execute
arbitrary code. (CVE-2018-16865)

An out-of-bounds read was discovered in systemd-journald. A local
attacker could potentially exploit this to obtain sensitive information
and bypass ASLR protections. (CVE-2018-16866)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 18.10:
  systemd                         239-7ubuntu10.6

Ubuntu 18.04 LTS:
  systemd                         237-3ubuntu10.11

Ubuntu 16.04 LTS:
  systemd                         229-4ubuntu21.15

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
  https://usn.ubuntu.com/usn/usn-3855-1
  CVE-2018-16864, CVE-2018-16865, CVE-2018-16866

Package Information:
  https://launchpad.net/ubuntu/+source/systemd/239-7ubuntu10.6
  https://launchpad.net/ubuntu/+source/systemd/237-3ubuntu10.11
  https://launchpad.net/ubuntu/+source/systemd/229-4ubuntu21.15