USN-2275-1: DBus vulnerabilities

Ubuntu Security Notice USN-2275-1

8th July, 2014

dbus vulnerabilities

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

  • Ubuntu 14.04 LTS
  • Ubuntu 13.10
  • Ubuntu 12.04 LTS

Summary

Several security issues were fixed in DBus.

Software description

  • dbus - simple interprocess messaging system

Details

Alban Crequy discovered that dbus-daemon incorrectly sent AccessDenied
errors to the service instead of the client when enforcing permissions. A
local user can use this issue to possibly deny access to the service.
(CVE-2014-3477)

Alban Crequy discovered that dbus-daemon incorrectly handled certain file
descriptors. A local attacker could use this issue to cause services or
clients to disconnect, resulting in a denial of service. (CVE-2014-3532,
CVE-2014-3533)

Update instructions

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

Ubuntu 14.04 LTS:
dbus 1.6.18-0ubuntu4.1
libdbus-1-3 1.6.18-0ubuntu4.1
Ubuntu 13.10:
dbus 1.6.12-0ubuntu10.1
libdbus-1-3 1.6.12-0ubuntu10.1
Ubuntu 12.04 LTS:
dbus 1.4.18-1ubuntu1.5
libdbus-1-3 1.4.18-1ubuntu1.5

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-2014-3477, CVE-2014-3532, CVE-2014-3533