Hash: SHA1

             AUSCERT External Security Bulletin Redistribution

          Important: rhev-hypervisor security and bug fix update
                                26 May 2010


        AusCERT Security Bulletin Summary

Product:           rhev-hypervisor
Publisher:         Red Hat
Operating System:  Red Hat Enterprise Linux Server 5
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Denial of Service               -- Remote/Unauthenticated
                   Unauthorised Access             -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2010-1188 CVE-2010-0727 CVE-2010-0624
                   CVE-2010-0433 CVE-2009-4307 CVE-2009-4027
                   CVE-2009-3555 CVE-2009-3245 CVE-2009-2409

Reference:         ESB-2010.0471

Original Bulletin: 

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Hash: SHA1

                   Red Hat Security Advisory

Synopsis:          Important: rhev-hypervisor security and bug fix update
Advisory ID:       RHSA-2010:0440-01
Product:           Red Hat Enterprise Virtualization
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2010-0440.html
Issue date:        2010-05-25
CVE Names:         CVE-2009-3245 CVE-2009-3555 

1. Summary:

An updated rhev-hypervisor package that fixes two security issues and
several bugs is now available.

The Red Hat Security Response Team has rated this update as having
important security impact. Common Vulnerability Scoring System (CVSS) base
scores, which give detailed severity ratings, are available for each
vulnerability from the CVE links in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Virtualization Hypervisor 5 - noarch

3. Description:

The rhev-hypervisor package provides a Red Hat Enterprise Virtualization
(RHEV) Hypervisor ISO disk image. The RHEV Hypervisor is a dedicated
Kernel-based Virtual Machine (KVM) hypervisor. It includes everything
necessary to run and manage virtual machines: A subset of the Red Hat
Enterprise Linux operating environment and the Red Hat Enterprise
Virtualization Agent.

Note: RHEV Hypervisor is only available for the Intel 64 and AMD64
architectures with virtualization extensions.

It was discovered that OpenSSL did not always check the return value of
the bn_wexpand() function. An attacker able to trigger a memory allocation
failure in that function could cause an application using the OpenSSL
library to crash or, possibly, execute arbitrary code. (CVE-2009-3245)

A flaw was found in the way the TLS/SSL (Transport Layer Security/Secure
Sockets Layer) protocols handled session renegotiation. A man-in-the-middle
attacker could use this flaw to prefix arbitrary plain text to a client's
session (for example, an HTTPS connection to a website). This could force
the server to process an attacker's request as if authenticated using the
victim's credentials. This update addresses this flaw in openssl, nss, and
gnutls by implementing the TLS Renegotiation Indication Extension, as
defined in RFC 5746. (CVE-2009-3555)

This updated package provides updated components that include fixes for
security issues; however, these issues have no security impact for RHEV
Hypervisor. These fixes are for kernel issues CVE-2009-4307, CVE-2010-0727,
CVE-2009-4027, and CVE-2010-1188; cpio issues CVE-2010-0624 and
CVE-2007-4476; gnutls issue CVE-2009-2409; openssl issue CVE-2010-0433; and
tar issues CVE-2010-0624 and CVE-2007-4476.

This update also fixes the following bugs:

* bridged network interfaces using the bnx2x, mlx4_en, enic and s2io
drivers had Large Receive Offload (LRO) enabled by default. This caused
significantly degraded network I/O performance. LRO has been disabled for
all network interface drivers which have LRO enabled by default in Red Hat
Enterprise Linux 5. With this change, network I/O performance is
significantly improved. (BZ#576374, BZ#579730)

* RHEV Hypervisor supported IPv6, but as this is not used to communicate
with the RHEV Manager, it is superfluous. Support for IPv6 has now been
disabled in RHEV Hypervisor. (BZ#577300)

* for VLAN interfaces, the hardware (MAC) address of the interface was set
only in the VLAN ifcfg script, not in the physical interface ifcfg script.
This caused network interfaces with VLAN tags to intermittently fail on
boot. The MAC address is now set in the ifcfg script for the underlying
physical interface. Network interfaces with VLAN tags now work consistently
between reboots. (BZ#581876)

* the hypervisor would hang on reboot after repeated upgrade operations,
due to GRUB accessing the /boot file system before it was flushed. The
/boot file system is now remounted before GRUB accesses it. (BZ#591111)

As RHEV Hypervisor is based on KVM, the bug fixes from the KVM update
RHBA-2010:0434 have been included in this update. Also included are the bug
fixes from the RHEV Manager Agent (VDSM) update RHBA-2010:0435.

KVM: https://rhn.redhat.com/errata/RHBA-2010-0434.html
VDSM: https://rhn.redhat.com/errata/RHBA-2010-0435.html

Users of the Red Hat Enterprise Virtualization Hypervisor are advised to
upgrade to this updated package, which corrects these issues.

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

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

533125 - CVE-2009-3555 TLS: MITM attacks via session renegotiation
570924 - CVE-2009-3245 openssl: missing bn_wexpand return value checks

6. Package List:

Red Hat Enterprise Virtualization Hypervisor 5:



These packages are GPG signed by Red Hat for security.  Our key and 
details on how to verify the signature are available from

7. References:


8. Contact:

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

Copyright 2010 Red Hat, Inc.
Version: GnuPG v1.4.4 (GNU/Linux)


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