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[ MDVSA-2014:214 ] dbus
Nov 18 2014 05:57PM
security mandriva com
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Mandriva Linux Security Advisory MDVSA-2014:214
Package : dbus
Date : November 18, 2014
Affected: Business Server 1.0
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
* 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 also resolves the CVE-2014-7824 security vulnerability.
Mandriva Business Server 1/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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