Besides providing the global system-wide communication bus, dbus also offers per-user “session” buses which applications in an user’s session can create and use to communicate with each other. Daniel Reed discovered that the default configuration of the session dbus allowed a local user to connect to another user’s session bus if its address was known. The fixed packages restrict the default permissions to the user who owns the session dbus instance.
Please note that a standard Ubuntu installation does not use the session bus for anything, so this can only be exploited if you are using custom software which uses it.
28 June 2005
A security issue affects these releases of Ubuntu and its derivatives:
Besides providing the global system-wide communication bus, dbus also offers per-user “session” buses which applications in an user’s session can create and use to communicate with each other. Daniel Reed discovered that the default configuration of the session dbus allowed a local user to connect to another user’s session bus if its address was known. The fixed packages restrict the default permissions to the user who owns the session dbus instance.
Please note that a standard Ubuntu installation does not use the session bus for anything, so this can only be exploited if you are using custom software which uses it.
The problem can be corrected by updating your system to the following package versions:
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
Vulmon