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Red Hat Security Advisory 2015-0126-01

Red Hat Security Advisory 2015-0126-01
Posted Feb 4, 2015
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2015-0126-01 - 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 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-based buffer overflow was found in glibc's __nss_hostname_digits_dots() function, which is used by the gethostbyname() and gethostbyname2() glibc function calls. A remote attacker able to make an application call either of these functions could use this flaw to execute arbitrary code with the permissions of the user running the application.

tags | advisory, remote, overflow, arbitrary, kernel
systems | linux, redhat
advisories | CVE-2014-3511, CVE-2014-3567, CVE-2014-3611, CVE-2014-3645, CVE-2014-3646, CVE-2015-0235
MD5 | 38f0c030cacab19a70e7221bfe5ea8c6

Red Hat Security Advisory 2015-0126-01

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

Synopsis: Critical: rhev-hypervisor6 security update
Advisory ID: RHSA-2015:0126-01
Product: Red Hat Enterprise Virtualization
Advisory URL: https://rhn.redhat.com/errata/RHSA-2015-0126.html
Issue date: 2015-02-04
CVE Names: CVE-2014-3511 CVE-2014-3567 CVE-2014-3611
CVE-2014-3645 CVE-2014-3646 CVE-2015-0235
=====================================================================

1. Summary:

An updated rhev-hypervisor6 package that fixes multiple security issues is
now available for Red Hat Enterprise Virtualization 3.

Red Hat Product Security has rated this update as having Critical 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:

RHEV Hypervisor for RHEL-6 - noarch

3. 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-based buffer overflow was found in glibc's
__nss_hostname_digits_dots() function, which is used by the gethostbyname()
and gethostbyname2() glibc function calls. A remote attacker able to make
an application call either of these functions could use this flaw to
execute arbitrary code with the permissions of the user running the
application. (CVE-2015-0235)

A race condition flaw was found in the way the Linux kernel's KVM subsystem
handled PIT (Programmable Interval Timer) emulation. A guest user who has
access to the PIT I/O ports could use this flaw to crash the host.
(CVE-2014-3611)

A flaw was found in the way OpenSSL handled fragmented handshake packets.
A man-in-the-middle attacker could use this flaw to force a TLS/SSL server
using OpenSSL to use TLS 1.0, even if both the client and the server
supported newer protocol versions. (CVE-2014-3511)

A memory leak flaw was found in the way an OpenSSL handled failed session
ticket integrity checks. A remote attacker could exhaust all available
memory of an SSL/TLS or DTLS server by sending a large number of invalid
session tickets to that server. (CVE-2014-3567)

It was found that the Linux kernel's KVM subsystem did not handle the VM
exits gracefully for the invept (Invalidate Translations Derived from EPT)
and invvpid (Invalidate Translations Based on VPID) instructions. On hosts
with an Intel processor and invept/invppid VM exit support, an unprivileged
guest user could use these instructions to crash the guest. (CVE-2014-3645,
CVE-2014-3646)

Red Hat would like to thank Qualys for reporting the CVE-2015-0235 issue,
Lars Bull of Google for reporting the CVE-2014-3611 issue, and the Advanced
Threat Research team at Intel Security for reporting the CVE-2014-3645 and
CVE-2014-3646 issues.

Users of the Red Hat Enterprise Virtualization Hypervisor are advised to
upgrade to this updated package.

4. Solution:

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/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/documentation/en-US/Red_Hat_Enterprise_Linux/6/ht
ml/Hypervisor_Deployment_Guide/chap-Deployment_Guide-Upgrading_Red_Hat_Ente
rprise_Virtualization_Hypervisors.html

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

1127504 - CVE-2014-3511 openssl: TLS protocol downgrade attack
1144825 - CVE-2014-3646 kernel: kvm: vmx: invvpid vm exit not handled
1144835 - CVE-2014-3645 kernel: kvm: vmx: invept vm exit not handled
1144878 - CVE-2014-3611 kernel: kvm: PIT timer race condition
1152563 - Tracker: RHEV-H 6.6 for RHEV 3.4.z build
1152961 - CVE-2014-3567 openssl: Invalid TLS/SSL session tickets could cause memory leak leading to server crash
1180044 - Incorrect glusterfs package in to RHEVH 6.6 for 3.4.4 and 3.5 build [rhev-3.4.z]
1183461 - CVE-2015-0235 glibc: __nss_hostname_digits_dots() heap-based buffer overflow
1185720 - Incorrect rhn-virtualization-host and rhn-virtualization-common packages in RHEVH 6.6 for rhev 3.4.5

6. Package List:

RHEV Hypervisor for RHEL-6:

noarch:
rhev-hypervisor6-6.6-20150123.1.el6ev.noarch.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/

7. References:

https://access.redhat.com/security/cve/CVE-2014-3511
https://access.redhat.com/security/cve/CVE-2014-3567
https://access.redhat.com/security/cve/CVE-2014-3611
https://access.redhat.com/security/cve/CVE-2014-3645
https://access.redhat.com/security/cve/CVE-2014-3646
https://access.redhat.com/security/cve/CVE-2015-0235
https://access.redhat.com/security/updates/classification/#critical

8. Contact:

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

Copyright 2015 Red Hat, Inc.
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