USN-4134-3: IBus vulnerability

USN-4134-3: IBus vulnerability

ibus vulnerability

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

  • Ubuntu 19.10
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS


IBus could allow local users to capture key strokes of other locally logged
in users.

Software Description

  • ibus – Intelligent Input Bus – core


USN-4134-1 fixed a vulnerability in IBus. The update caused a regression in
some Qt applications and the fix was subsequently reverted in
USN-4134-2. The regression has since been resolved and so this update fixes
the original vulnerability.

We apologize for the inconvenience.

Original advisory details:

Simon McVittie discovered that IBus did not enforce appropriate access
controls on its private D-Bus socket. A local unprivileged user who
discovers the IBus socket address of another user could exploit this to
capture the key strokes of the other user.

Update instructions

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

Ubuntu 19.10
Ubuntu 18.04 LTS
Ubuntu 16.04 LTS

To update your system, please follow these instructions:

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


Source: USN-4134-3: IBus vulnerability

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