AusCERT - ESB-2013.0658 - [Linux][RedHat] hypervkvpd: Denial of service

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ESB-2013.0658 - [Linux][RedHat] hypervkvpd: Denial of service - Existing account
Date: 10 May 2013

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2013.0658
                Low: hypervkvpd security and bug fix update
                                10 May 2013

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           hypervkvpd
Publisher:         Red Hat
Operating System:  Red Hat Enterprise Linux Server 5
                   Red Hat Enterprise Linux WS/Desktop 5
                   Linux variants
Impact/Access:     Denial of Service -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2012-5532  

Original Bulletin: 
   https://rhn.redhat.com/errata/RHSA-2013-0807.html

Comment: This advisory references vulnerabilities in products which run on 
         platforms other than Red Hat. It is recommended that administrators
         running hypervkvpd check for an updated version of the software for
         their operating system.

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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Low: hypervkvpd security and bug fix update
Advisory ID:       RHSA-2013:0807-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2013-0807.html
Issue date:        2013-05-09
CVE Names:         CVE-2012-5532 
=====================================================================

1. Summary:

An updated hypervkvpd package that fixes one security issue and one bug is
now available for Red Hat Enterprise Linux 5.

The Red Hat Security Response Team has rated this update as having low
security impact. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available from the CVE link in
the References section.

2. Relevant releases/architectures:

RHEL Desktop Multi OS (v. 5 client) - i386, x86_64
RHEL Virtualization (v. 5 server) - i386, ia64, x86_64
Red Hat Enterprise Linux (v. 5 server) - i386, x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64

3. Description:

The hypervkvpd package contains hypervkvpd, the guest Microsoft Hyper-V
Key-Value Pair (KVP) daemon. The daemon passes basic information to the
host through VMBus, such as the guest IP address, fully qualified domain
name, operating system name, and operating system release number.

A denial of service flaw was found in the way hypervkvpd processed certain
Netlink messages. A local, unprivileged user in a guest (running on
Microsoft Hyper-V) could send a Netlink message that, when processed, would
cause the guest's hypervkvpd daemon to exit. (CVE-2012-5532)

The CVE-2012-5532 issue was discovered by Florian Weimer of the Red Hat
Product Security Team.

This update also fixes the following bug:

* The hypervkvpd daemon did not close the file descriptors for pool files
when they were updated. This could eventually lead to hypervkvpd crashing
with a "KVP: Failed to open file, pool: 1" error after consuming all
available file descriptors. With this update, the file descriptors are
closed, correcting this issue. (BZ#953502)

Users of hypervkvpd are advised to upgrade to this updated package, which
contains backported patches to correct these issues. After installing the
update, it is recommended to reboot all guest machines.

4. Solution:

Before applying this update, make sure all previously-released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/knowledge/articles/11258

5. Bugs fixed (http://bugzilla.redhat.com/):

877572 - CVE-2012-5532 hypervkvpd: Netlink source address validation allows denial of service
953502 - hypervkvpd dies from time to time with "KVP: Failed to open file, pool: 1"

6. Package List:

Red Hat Enterprise Linux Desktop (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/hypervkvpd-0-0.7.el5_9.3.src.rpm

i386:
hypervkvpd-0-0.7.el5_9.3.i686.rpm
hypervkvpd-debuginfo-0-0.7.el5_9.3.i686.rpm

x86_64:
hypervkvpd-0-0.7.el5_9.3.x86_64.rpm
hypervkvpd-debuginfo-0-0.7.el5_9.3.x86_64.rpm

RHEL Desktop Multi OS (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/hypervkvpd-0-0.7.el5_9.3.src.rpm

i386:
hypervkvpd-0-0.7.el5_9.3.i686.rpm
hypervkvpd-debuginfo-0-0.7.el5_9.3.i686.rpm

x86_64:
hypervkvpd-0-0.7.el5_9.3.x86_64.rpm
hypervkvpd-debuginfo-0-0.7.el5_9.3.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/hypervkvpd-0-0.7.el5_9.3.src.rpm

i386:
hypervkvpd-0-0.7.el5_9.3.i686.rpm
hypervkvpd-debuginfo-0-0.7.el5_9.3.i686.rpm

x86_64:
hypervkvpd-0-0.7.el5_9.3.x86_64.rpm
hypervkvpd-debuginfo-0-0.7.el5_9.3.x86_64.rpm

RHEL Virtualization (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/hypervkvpd-0-0.7.el5_9.3.src.rpm

i386:
hypervkvpd-0-0.7.el5_9.3.i686.rpm
hypervkvpd-debuginfo-0-0.7.el5_9.3.i686.rpm

ia64:
hypervkvpd-0-0.7.el5_9.3.ia64.rpm
hypervkvpd-debuginfo-0-0.7.el5_9.3.ia64.rpm

x86_64:
hypervkvpd-0-0.7.el5_9.3.x86_64.rpm
hypervkvpd-debuginfo-0-0.7.el5_9.3.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2012-5532.html
https://access.redhat.com/security/updates/classification/#low

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2013 Red Hat, Inc.
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