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Ubuntu Security Notice USN-4134-2
September 23, 2019

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

- Ubuntu 19.04
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

USN 4134-1 introduced a regression in IBus.

Software Description:
- ibus: Intelligent Input Bus - core

Details:

USN-4134-1 fixed a vulnerability in IBus. The security fix introduced a
regression when being used with Qt applications. This update reverts the
security fix pending further investigation.

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 19.04:
  ibus                            1.5.19-1ubuntu2.2

Ubuntu 18.04 LTS:
  ibus                            1.5.17-3ubuntu5.2

Ubuntu 16.04 LTS:
  ibus                            1.5.11-1ubuntu2.3

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

References:
  https://usn.ubuntu.com/4134-2
  https://usn.ubuntu.com/4134-1
  https://launchpad.net/bugs/1844853

Package Information:
  https://launchpad.net/ubuntu/+source/ibus/1.5.19-1ubuntu2.2
  https://launchpad.net/ubuntu/+source/ibus/1.5.17-3ubuntu5.2
  https://launchpad.net/ubuntu/+source/ibus/1.5.11-1ubuntu2.3