USN-2352-1: DBus vulnerabilities

Ubuntu Security Notice USN-2352-1

22nd September, 2014

dbus vulnerabilities

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

  • Ubuntu 14.04 LTS
  • Ubuntu 12.04 LTS
  • Ubuntu 10.04 LTS

Summary

Several security issues were fixed in DBus.

Software description

  • dbus - simple interprocess messaging system

Details

Simon McVittie discovered that DBus incorrectly handled the file
descriptors message limit. A local attacker could use this issue to cause
DBus to crash, resulting in a denial of service, or possibly execute
arbitrary code. This issue only applied to Ubuntu 12.04 LTS and Ubuntu
14.04 LTS. (CVE-2014-3635)

Alban Crequy discovered that DBus incorrectly handled a large number of
file descriptor messages. A local attacker could use this issue to cause
DBus to stop responding, resulting in a denial of service. This issue only
applied to Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2014-3636)

Alban Crequy discovered that DBus incorrectly handled certain file
descriptor messages. A local attacker could use this issue to cause DBus
to maintain persistent connections, possibly resulting in a denial of
service. This issue only applied to Ubuntu 12.04 LTS and Ubuntu 14.04 LTS.
(CVE-2014-3637)

Alban Crequy discovered that DBus incorrectly handled a large number of
parallel connections and parallel message calls. A local attacker could use
this issue to cause DBus to consume resources, possibly resulting in a
denial of service. (CVE-2014-3638)

Alban Crequy discovered that DBus incorrectly handled incomplete
connections. A local attacker could use this issue to cause DBus to fail
legitimate connection attempts, resulting in a denial of service.
(CVE-2014-3639)

Update instructions

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

Ubuntu 14.04 LTS:
dbus 1.6.18-0ubuntu4.2
libdbus-1-3 1.6.18-0ubuntu4.2
Ubuntu 12.04 LTS:
dbus 1.4.18-1ubuntu1.6
libdbus-1-3 1.4.18-1ubuntu1.6
Ubuntu 10.04 LTS:
dbus 1.2.16-2ubuntu4.8
libdbus-1-3 1.2.16-2ubuntu4.8

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-2014-3635, CVE-2014-3636, CVE-2014-3637, CVE-2014-3638, CVE-2014-3639