Several vulnerabilities have been discovered in dbus, an asynchronous inter-process communication system. The Common Vulnerabilities and Exposures project identifies the following problems: CVE-2014-3477 Alban Crequy at Collabora Ltd. discovered that dbus-daemon sends an AccessDenied error to the service instead of a client when the client is prohibited from accessing the service. A local attacker could use this flaw to cause a bus-activated service that is not currently running to attempt to start, and fail, denying other users access to this service. CVE-2014-3532 Alban Crequy at Collabora Ltd. discovered a bug in dbus-daemon's support for file descriptor passing. A malicious process could force system services or user applications to be disconnected from the D-Bus system by sending them a message containing a file descriptor, leading to a denial of service. CVE-2014-3533 Alban Crequy at Collabora Ltd. and Alejandro Martínez Suárez discovered that a malicious process could force services to be disconnected from the D-Bus system by causing dbus-daemon to attempt to forward invalid file descriptors to a victim process, leading to a denial of service.

For the stable distribution (wheezy), these problems have been fixed in version 1.6.8-1+deb7u3. For the unstable distribution (sid), these problems have been fixed in version 1.8.6-1. We recommend that you upgrade your dbus packages.

D-Bus is a message bus, used for sending messages between applications. Conceptually, it fits somewhere in between raw sockets and CORBA in terms of complexity.

dbus on Debian Linux

This check tests the installed software version using the apt package manager.

• http://www.debian.org/security/2014/dsa-2971.html

---

Updated on 2015-03-25