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Ubuntu Security Notice USN-4204-1
November 28, 2019

python-psutil vulnerability
==========================================================================

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

- Ubuntu 19.10
- Ubuntu 19.04
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

psutil could be made to crash or run programs.

Software Description:
- python-psutil: module providing convenience functions for managing processes

Details:

Riccardo Schirone discovered that psutil incorrectly handled certain
reference counting operations. An attacker could use this issue to cause
psutil to crash, resulting in a denial of service, or possibly execute
arbitrary code.

Update instructions:

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

Ubuntu 19.10:
  python-psutil                   5.5.1-1ubuntu0.19.10.1
  python3-psutil                  5.5.1-1ubuntu0.19.10.1

Ubuntu 19.04:
  python-psutil                   5.5.1-1ubuntu0.19.04.1
  python3-psutil                  5.5.1-1ubuntu0.19.04.1

Ubuntu 18.04 LTS:
  python-psutil                   5.4.2-1ubuntu0.1
  python3-psutil                  5.4.2-1ubuntu0.1

Ubuntu 16.04 LTS:
  python-psutil                   3.4.2-1ubuntu0.1
  python3-psutil                  3.4.2-1ubuntu0.1

In general, a standard system update will make all the necessary changes.

References:
  https://usn.ubuntu.com/4204-1
  CVE-2019-18874

Package Information:
  https://launchpad.net/ubuntu/+source/python-psutil/5.5.1-1ubuntu0.19.10.1
  https://launchpad.net/ubuntu/+source/python-psutil/5.5.1-1ubuntu0.19.04.1
  https://launchpad.net/ubuntu/+source/python-psutil/5.4.2-1ubuntu0.1
  https://launchpad.net/ubuntu/+source/python-psutil/3.4.2-1ubuntu0.1