dbus vulnerabilities

22 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 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

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