Issued:
2015-02-04
Updated:
2015-02-04

RHSA-2015:0126 - Critical: rhev-hypervisor6 security update

Synopsis

Critical: rhev-hypervisor6 security update

Type/Severity

Security Advisory Critical

Topic

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.

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.

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:

This content is not included.https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Hypervisor_Deployment_Guide/chap-Deployment_Guide-Upgrading_Red_Hat_Enterprise_Virtualization_Hypervisors.html

Affected Products

ProductVersionArch
Red Hat Virtualization6x86_64

Updated Packages

  • rhev-hypervisor6-6.6-20150123.1.el6ev.noarch.rpm
  • rhev-hypervisor6-6.6-20150123.1.el6ev.src.rpm

Fixes

CVEs

References

Additional information