Mandriva Linux Security Advisory : dbus (MDVSA-2014:214)

This script is Copyright (C) 2014 Tenable Network Security, Inc.

Synopsis :

The remote Mandriva Linux host is missing one or more security

Description :

Updated dbus packages fixes the following security issues :

Alban Crequy and Simon McVittie discovered several vulnerabilities in
the D-Bus message daemon :

On 64-bit platforms, file descriptor passing could be abused by local
users to cause heap corruption in dbus-daemon, leading to a crash, or
potentially to arbitrary code execution (CVE-2014-3635).

A denial-of-service vulnerability in dbus-daemon allowed local
attackers to prevent new connections to dbus-daemon, or disconnect
existing clients, by exhausting descriptor limits (CVE-2014-3636).

Malicious local users could create D-Bus connections to dbus-daemon
which could not be terminated by killing the participating processes,
resulting in a denial-of-service vulnerability (CVE-2014-3637).

dbus-daemon suffered from a denial-of-service vulnerability in the
code which tracks which messages expect a reply, allowing local
attackers to reduce the performance of dbus-daemon (CVE-2014-3638).

dbus-daemon did not properly reject malicious connections from local
users, resulting in a denial-of-service vulnerability (CVE-2014-3639).

The patch issued by the D-Bus maintainers for CVE-2014-3636 was based
on incorrect reasoning, and does not fully prevent the attack
described as CVE-2014-3636 part A, which is repeated below. Preventing
that attack requires raising the system dbus-daemon's RLIMIT_NOFILE
(ulimit -n) to a higher value.

By queuing up the maximum allowed number of fds, a malicious sender
could reach the system dbus-daemon's RLIMIT_NOFILE (ulimit -n,
typically 1024 on Linux). This would act as a denial of service in two
ways :

- new clients would be unable to connect to the

- when receiving a subsequent message from a
non-malicious client that contained a fd, dbus-daemon
would receive the MSG_CTRUNC flag, indicating that the
list of fds was truncated; kernel fd-passing APIs do
not provide any way to recover from that, so
dbus-daemon responds to MSG_CTRUNC by disconnecting
the sender, causing denial of service to that sender.

This update also resolves the CVE-2014-7824 security vulnerability.

See also :

Solution :

Update the affected packages.

Risk factor :

Medium / CVSS Base Score : 6.8
CVSS Temporal Score : 5.9
Public Exploit Available : false

Family: Mandriva Local Security Checks

Nessus Plugin ID: 79322 ()

Bugtraq ID: 69829

CVE ID: CVE-2014-3635

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