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Ubuntu Security Notice USN-2352-1
September 22, 2014

dbus vulnerabilities
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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 versions:

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

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

References:
http://www.ubuntu.com/usn/usn-2352-1
CVE-2014-3635, CVE-2014-3636, CVE-2014-3637, CVE-2014-3638,
CVE-2014-3639

Package Information:
https://launchpad.net/ubuntu/+source/dbus/1.6.18-0ubuntu4.2
https://launchpad.net/ubuntu/+source/dbus/1.4.18-1ubuntu1.6
https://launchpad.net/ubuntu/+source/dbus/1.2.16-2ubuntu4.8

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