RHSA-2013:0636 - Security Advisory

Topic

An updated rhev-hypervisor6 package that fixes several 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 flaw was found in the way QEMU-KVM emulated the e1000 network interface
card when the host was configured to accept jumbo network frames, and a
guest using the e1000 emulated driver was not. A remote attacker could use
this flaw to crash the guest or, potentially, execute arbitrary code with
root privileges in the guest. (CVE-2012-6075)

It was discovered that GnuTLS leaked timing information when decrypting
TLS/SSL protocol encrypted records when CBC-mode cipher suites were used. A
remote attacker could possibly use this flaw to retrieve plain text from
the encrypted packets by using a TLS/SSL server as a padding oracle.
(CVE-2013-1619)

It was discovered that OpenSSL leaked timing information when decrypting
TLS/SSL and DTLS protocol encrypted records when CBC-mode cipher suites
were used. A remote attacker could possibly use this flaw to retrieve plain
text from the encrypted packets by using a TLS/SSL or DTLS server as a
padding oracle. (CVE-2013-0169)

A NULL pointer dereference flaw was found in the OCSP response verification
in OpenSSL. A malicious OCSP server could use this flaw to crash
applications performing OCSP verification by sending a specially-crafted
response. (CVE-2013-0166)

It was discovered that the TLS/SSL protocol could leak information about
plain text when optional compression was used. An attacker able to control
part of the plain text sent over an encrypted TLS/SSL connection could
possibly use this flaw to recover other portions of the plain text.
(CVE-2012-4929)

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-2013-0292 (dbus-glib issue)

CVE-2013-0228, CVE-2013-0268, and CVE-2013-0871 (kernel issues)

CVE-2013-0338 (libxml2 issue)

This update contains the builds from the following errata:

ovirt-node: RHBA-2013:0634
https://rhn.redhat.com/errata/RHBA-2013-0634.html kernel: RHSA-2013:0630
https://rhn.redhat.com/errata/RHSA-2013-0630.html dbus-glib: RHSA-2013:0568
https://rhn.redhat.com/errata/RHSA-2013-0568.html libcgroup: RHBA-2013:0560
https://rhn.redhat.com/errata/RHBA-2013-0560.html vdsm: RHBA-2013:0635
https://rhn.redhat.com/errata/RHBA-2013-0635.html selinux-policy: RHBA-2013:0618
https://rhn.redhat.com/errata/RHBA-2013-0618.html qemu-kvm-rhev: RHSA-2013:0610
https://rhn.redhat.com/errata/RHSA-2013-0610.html glusterfs: RHBA-2013:0620
https://rhn.redhat.com/errata/RHBA-2013-0620.html gnutls: RHSA-2013:0588
https://rhn.redhat.com/errata/RHSA-2013-0588.html ipmitool: RHBA-2013:0572
https://rhn.redhat.com/errata/RHBA-2013-0572.html libxml2: RHSA-2013:0581
https://rhn.redhat.com/errata/RHSA-2013-0581.html openldap: RHBA-2013:0598
https://rhn.redhat.com/errata/RHBA-2013-0598.html openssl: RHSA-2013:0587
https://rhn.redhat.com/errata/RHSA-2013-0587.html

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/knowledge/articles/11258

To upgrade Hypervisors in Red Hat Enterprise Virtualization
environments using the disk image provided by this package, refer to:

https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Hypervisor_Deployment_Guide/chap-Deployment_Guide-Upgrading_Red_Hat_Enterprise_Virtualization_Hypervisors.html

Affected Products

• Red Hat Virtualization 6 x86_64

Fixes

• BZ - 857051 - CVE-2012-4929 SSL/TLS CRIME attack against HTTPS
• BZ - 889301 - CVE-2012-6075 qemu: e1000 driver buffer overflow when processing large packets when SBP and LPE flags are disabled
• BZ - 907589 - CVE-2013-0169 SSL/TLS: CBC padding timing attack (lucky-13)
• BZ - 908052 - CVE-2013-0166 openssl: DoS due to improper handling of OCSP response verification
• BZ - 908238 - CVE-2013-1619 gnutls: TLS CBC padding timing attack (lucky-13)
• BZ - 913267 - rhev-hypervisor 6.4 Update 1 release

CVEs

• CVE-2013-0169
• CVE-2013-1619
• CVE-2012-4929
• CVE-2013-0166
• CVE-2012-6075

References

• https://access.redhat.com/security/updates/classification/#important
• https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Hypervisor_Deployment_Guide/chap-Deployment_Guide-Upgrading_Red_Hat_Enterprise_Virtualization_Hypervisors.html