USN-4269-1: systemd vulnerabilities

Severity

Medium

Vendor

Canonical Ubuntu

Description

It was discovered that systemd incorrectly handled certain PIDFile files. A local attacker could possibly use this issue to trick systemd into killing privileged processes. This issue only affected Ubuntu 16.04 LTS. (CVE-2018-16888) It was discovered that systemd incorrectly handled certain udevadm trigger commands. A local attacker could possibly use this issue to cause systemd to consume resources, leading to a denial of service. (CVE-2019-20386) Jann Horn discovered that systemd incorrectly handled services that use the DynamicUser property. A local attacker could possibly use this issue to access resources owned by a different service in the future. This issue only affected Ubuntu 18.04 LTS. (CVE-2019-3843, CVE-2019-3844) Tavis Ormandy discovered that systemd incorrectly handled certain Polkit queries. A local attacker could use this issue to cause systemd to crash, resulting in a denial of service, or possibly execute arbitrary code and escalate privileges. (CVE-2020-1712)

CVEs contained in this USN include: CVE-2018-16888, CVE-2019-3843, CVE-2019-3844, CVE-2019-20386, CVE-2020-1712.

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

• cflinuxfs3
  • All versions prior to 0.162.0
• Xenial Stemcells
  • 621.x versions prior to 621.57
  • 456.x versions prior to 456.98
  • 315.x versions prior to 315.169
  • 250.x versions prior to 250.183
  • 170.x versions prior to 170.203
  • 97.x versions prior to 97.232
  • All other stemcells not listed.
• CF Deployment
  • All versions prior to v12.31.0

Mitigation

Users of affected products are strongly encouraged to follow the mitigations below. The Cloud Foundry project recommends upgrading the following releases:

• cflinuxfs3
  • Upgrade All versions to 0.162.0 or greater
• Xenial Stemcells
  • Upgrade 621.x versions to 621.57 or greater
  • Upgrade 456.x versions to 456.98 or greater
  • Upgrade 315.x versions to 315.169 or greater
  • Upgrade 250.x versions to 250.183 or greater
  • Upgrade 170.x versions to 170.203 or greater
  • Upgrade 97.x versions to 97.232 or greater
  • All other stemcells should be upgraded to the latest version available on bosh.io 
• CF Deployment
  • • Upgrade All versions to v12.31.0 or greater

History

2020-02-05: Initial vulnerability report published.