USN-5244-2: DBus vulnerability

Publication date

9 May 2022

Overview

DBus could be made to crash if it received specially crafted input.


Packages

  • dbus - simple interprocess messaging system

Details

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.

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

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
20.04 focal dbus –  1.12.16-2ubuntu2.2
libdbus-1-3 –  1.12.16-2ubuntu2.2
18.04 bionic dbus –  1.12.2-1ubuntu1.3
libdbus-1-3 –  1.12.2-1ubuntu1.3

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