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[ MDVSA-2015:176 ] dbus
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Mandriva Linux Security Advisory MDVSA-2015:176
Package : dbus
Date : March 30, 2015
Affected: Business Server 2.0
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
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
* 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).
Mandriva Business Server 2/X86_64:
To upgrade automatically use MandrivaUpdate or urpmi. The verification
of md5 checksums and GPG signatures is performed automatically for you.
All packages are signed by Mandriva for security. You can obtain the
GPG public key of the Mandriva Security Team by executing:
gpg --recv-keys --keyserver pgp.mit.edu 0x22458A98
You can view other update advisories for Mandriva Linux at:
If you want to report vulnerabilities, please contact
Type Bits/KeyID Date User ID
pub 1024D/22458A98 2000-07-10 Mandriva Security Team
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