USN-3116-1: DBus vulnerabilities

Ubuntu Security Notice USN-3116-1

1st 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 version:

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

CVE-2015-0245