RHSA-2012:0109 - Security Advisory

Topic

An updated rhev-hypervisor6 package that fixes multiple security issues and
various 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.

Description

The rhev-hypervisor6 package provides a Red Hat Enterprise Virtualization
Hypervisor ISO disk image. The Red Hat Enterprise Virtualization 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: Red Hat Enterprise Virtualization Hypervisor is only available for
the Intel 64 and AMD64 architectures with virtualization extensions.

A heap overflow flaw was found in the way QEMU-KVM emulated the e1000
network interface card. A privileged guest user in a virtual machine whose
network interface is configured to use the e1000 emulated driver could use
this flaw to crash the host or, possibly, escalate their privileges on the
host. (CVE-2012-0029)

An information leak flaw was found in the SSL 3.0 protocol implementation
in OpenSSL. Incorrect initialization of SSL record padding bytes could
cause an SSL client or server to send a limited amount of possibly
sensitive data to its SSL peer via the encrypted connection.
(CVE-2011-4576)

A denial of service flaw was found in the RFC 3779 implementation in
OpenSSL. A remote attacker could use this flaw to make an application using
OpenSSL exit unexpectedly by providing a specially-crafted X.509
certificate that has malformed RFC 3779 extension data. (CVE-2011-4577)

It was discovered that OpenSSL did not limit the number of TLS/SSL
handshake restarts required to support Server Gated Cryptography. A remote
attacker could use this flaw to make a TLS/SSL server using OpenSSL consume
an excessive amount of CPU by continuously restarting the handshake.
(CVE-2011-4619)

Red Hat would like to thank Nicolae Mogoreanu for reporting CVE-2012-0029.

This updated package provides updated components that include fixes for
various security issues. These issues have no security impact on Red Hat
Enterprise Virtualization Hypervisor itself, however. The security fixes
included in this update address the following CVE numbers:

CVE-2009-5029 and CVE-2011-4609 (glibc issues)

CVE-2012-0056 (kernel issue)

CVE-2011-4108 and CVE-2012-0050 (openssl issues)

This update also fixes the following bugs:

• Previously, it was possible to begin a Hypervisor installation without

any valid disks to install to.

Now, if no valid disks are found for Hypervisor installation, a message is
displayed informing the user that there are no valid disks for
installation. (BZ#781471)

• Previously, the user interface for the Hypervisor did not indicate

whether the system was registered with Red Hat Network (RHN) Classic or RHN
Satellite. As a result, customers could not easily determine the
registration status of their Hypervisor installations.

The TUI has been updated to display the registration status of the
Hypervisor. (BZ#788223)

• Previously, autoinstall would fail if the firstboot or reinstall options

were passed but local_boot or upgrade were not passed. Now, neither the
local_boot or upgrade parameters are required for autoinstall. (BZ#788225)

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

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/kb/docs/DOC-11259

Affected Products

• Red Hat Virtualization 6 x86_64

Fixes

• BZ - 771775 - CVE-2011-4576 openssl: uninitialized SSL 3.0 padding
• BZ - 771778 - CVE-2011-4577 openssl: malformed RFC 3779 data can cause assertion failures
• BZ - 771780 - CVE-2011-4619 openssl: SGC restart DoS attack
• BZ - 772075 - CVE-2012-0029 qemu-kvm: e1000: process_tx_desc legacy mode packets heap overflow
• BZ - 781472 - Subscription Asset Manager options should be disabled if network is disable.
• BZ - 788225 - autoinstall fails when local_boot or upgrade not passed on command line
• BZ - 788226 - rhev-hypervisor6 6.2 Update 2 Release bugzilla

CVEs

• CVE-2012-0029
• CVE-2011-4577
• CVE-2011-4576
• CVE-2011-4619

References

• https://access.redhat.com/security/updates/classification/#important
• http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Virtualization/3.0/html/Technical_Notes/