USN-3116-1: DBus vulnerabilities

1 November 2016

dbus vulnerabilities

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

  • Ubuntu 16.10
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS
  • Ubuntu 12.04 LTS

Summary

Several security issues were fixed in DBus.

Software Description

  • dbus - simple interprocess messaging system

Details

It was discovered that DBus incorrectly validated the source of ActivationFailure signals. A local attacker could use this issue to cause a denial of service. This issue only applied to Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2015-0245)

It was discovered that DBus incorrectly handled certain format strings. A local attacker could use this issue to cause a denial of service, or possibly execute arbitrary code. This issue is only exposed to unprivileged users when the fix for CVE-2015-0245 is not applied, hence this issue is only likely to affect Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. Ubuntu 16.04 LTS and Ubuntu 16.10 have been updated as a preventative measure in the event that a new attack vector for this issue is discovered. (No CVE number)

Update instructions

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

Ubuntu 16.10
dbus - 1.10.10-1ubuntu1.1
libdbus-1-3 - 1.10.10-1ubuntu1.1
Ubuntu 16.04 LTS
dbus - 1.10.6-1ubuntu3.1
libdbus-1-3 - 1.10.6-1ubuntu3.1
Ubuntu 14.04 LTS
dbus - 1.6.18-0ubuntu4.4
libdbus-1-3 - 1.6.18-0ubuntu4.4
Ubuntu 12.04 LTS
dbus - 1.4.18-1ubuntu1.8
libdbus-1-3 - 1.4.18-1ubuntu1.8

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

References