Executive Summary

Title IBus vulnerability
Name USN-4134-3 First vendor Publication 2020-03-24
Vendor Ubuntu Last vendor Modification 2020-03-24
Severity (Vendor) N/A Revision N/A

Security-Database Scoring CVSS v3

Cvss vector : CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Overall CVSS Score 7.1
Base Score 7.1 Environmental Score 7.1
impact SubScore 5.2 Temporal Score 7.1
Exploitabality Sub Score 1.8
Attack Vector Local Attack Complexity Low
Privileges Required Low User Interaction None
Scope Unchanged Confidentiality Impact High
Integrity Impact High Availability Impact None
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:L/AC:L/Au:N/C:P/I:P/A:N)
Cvss Base Score 3.6 Attack Range Local
Cvss Impact Score 4.9 Attack Complexity Low
Cvss Expoit Score 3.9 Authentication None Required
Calculate full CVSS 2.0 Vectors scores


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:
ibus 1.5.21-1~exp2ubuntu2.1

Ubuntu 18.04 LTS:
ibus 1.5.17-3ubuntu5.3

Ubuntu 16.04 LTS:
ibus 1.5.11-1ubuntu2.4

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


Package Information:

Original Source

Url : http://www.ubuntu.com/usn/USN-4134-3

CPE : Common Platform Enumeration

Application 1
Os 2

Alert History

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Date Informations
2020-05-23 13:03:46
  • Multiple Updates
2020-03-24 13:17:47
  • First insertion