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.