Mandriva Linux Security Advisory : dbus (MDVSA-2015:176)

This script is Copyright (C) 2015 Tenable Network Security, Inc.


Synopsis :

The remote Mandriva Linux host is missing one or more security
updates.

Description :

Updated dbus packages fix multiple vulnerabilities :

A denial of service vulnerability in D-Bus before 1.6.20 allows a
local attacker to cause a bus-activated service that is not currently
running to attempt to start, and fail, denying other users access to
this service Additionally, in highly unusual environments the same
flaw could lead to a side channel between processes that should not be
able to communicate (CVE-2014-3477).

A flaw was reported in D-Bus's file descriptor passing feature. A
local attacker could use this flaw to cause a service or application
to disconnect from the bus, typically resulting in that service or
application exiting (CVE-2014-3532).

A flaw was reported in D-Bus's file descriptor passing feature. A
local attacker could use this flaw to cause an invalid file descriptor
to be forwarded to a service or application, causing it to disconnect
from the bus, typically resulting in that service or application
exiting (CVE-2014-3533).

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
dbus-daemon

- 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 resolves the issue (CVE-2014-7824).

non-systemd processes can make dbus-daemon think systemd failed to
activate a system service, resulting in an error reply back to the
requester, causing a local denial of service (CVE-2015-0245).

See also :

http://advisories.mageia.org/MGASA-2014-0266.html
http://advisories.mageia.org/MGASA-2014-0294.html
http://advisories.mageia.org/MGASA-2014-0395.html
http://advisories.mageia.org/MGASA-2014-0457.html
http://advisories.mageia.org/MGASA-2015-0071.html

Solution :

Update the affected packages.

Risk factor :

Medium / CVSS Base Score : 6.8
(CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P)

Family: Mandriva Local Security Checks

Nessus Plugin ID: 82451 ()

Bugtraq ID:

CVE ID: CVE-2014-3477
CVE-2014-3532
CVE-2014-3533
CVE-2014-3635
CVE-2014-3636
CVE-2014-3637
CVE-2014-3638
CVE-2014-3639
CVE-2014-7824
CVE-2015-0245

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