USN-5244-2: DBus vulnerability | Cloud Foundry

Severity

Low

Vendor

Canonical Ubuntu

Versions Affected

• Canonical Ubuntu 18.04

Description

USN-5244-1 fixed a vulnerability in DBus. This update provides the corresponding update for Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. Original advisory details: Daniel Onaca discovered that DBus contained a use-after-free vulnerability, caused by the incorrect handling of usernames sharing the same UID. An attacker could possibly use this issue to cause DBus to crash, resulting in a denial of service. Update Instructions: Run sudo ua fix USN-5244-2 to fix the vulnerability. The problem can be corrected by updating your system to the following package versions: dbus-1-doc – 1.12.2-1ubuntu1.3 dbus – 1.12.2-1ubuntu1.3 libdbus-1-dev – 1.12.2-1ubuntu1.3 dbus-user-session – 1.12.2-1ubuntu1.3 dbus-x11 – 1.12.2-1ubuntu1.3 dbus-tests – 1.12.2-1ubuntu1.3 libdbus-1-3 – 1.12.2-1ubuntu1.3 No subscription required

CVEs contained in this USN include: CVE-2020-35512.

Affected Cloud Foundry Products and Versions

Severity is low unless otherwise noted.

• Bionic Stemcells
  • 1.x versions prior to 1.84
  • All other stemcells not listed.
• cflinuxfs3
  • All versions prior to 0.294.0
• CF Deployment
  • All versions prior to 21.0.0, or later versions with Bionic Stemcells prior to 1.84

Mitigation

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

• Bionic Stemcells
  • Upgrade 1.x versions to 1.84 or greater
  • All other stemcells should be upgraded to the latest version available on bosh.io.
• cflinuxfs3
  • Upgrade all versions to 0.294.0 or greater
• CF Deployment
  • Upgrade all versions to 21.0.0 or greater and upgrade Bionic Stemcells to 1.84 or greater

References

• USN Notice
• VMware Tanzu Disclosure
• CVE-2020-35512

History

2022-07-29: Initial vulnerability report published.