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computer vulnerability bulletin CVE-2014-3477

dbus: denial of service via AccessDenied

Synthesis of the vulnerability

A local attacker can send a malicious message to a dbus service, in order to trigger a denial of service.
Impacted software: Debian, Fedora, openSUSE, Ubuntu, Unix (platform) ~ not comprehensive.
Severity of this computer vulnerability: 1/4.
Consequences of a hack: denial of service on service, denial of service on client.
Attacker's origin: user shell.
Creation date: 11/06/2014.
Références of this announce: CVE-2014-3477, DSA-2971-1, FEDORA-2014-17570, FEDORA-2014-17595, FEDORA-2014-8059, MDVSA-2015:176, openSUSE-SU-2014:0821-1, openSUSE-SU-2014:0874-1, USN-2275-1, VIGILANCE-VUL-14878.

Description of the vulnerability

The D-Bus system is used by local applications, in order to exchange messages.

However, when the client sends a message to a stopped service, with a security policy denying this message, the service sends an AccessDenied error message to itself.

A local attacker can therefore send a malicious message to a dbus service, in order to trigger a denial of service.
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