Issued:
2017-03-01
Updated:
2017-03-01

RHSA-2017:0350 - Important: qemu-kvm-rhev security and bug fix update

Synopsis

Important: qemu-kvm-rhev security and bug fix update

Type/Severity

Security Advisory Important

Topic

An update for qemu-kvm-rhev is now available for RHEV 3.X Hypervisor and Agents for RHEL-7 and RHEV 4.X RHEV-H and Agents for RHEL-7.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

KVM (Kernel-based Virtual Machine) is a full virtualization solution for Linux on a variety of architectures. The qemu-kvm-rhev packages provide the user-space component for running virtual machines that use KVM in environments managed by Red Hat products.

Security Fix(es):

  • Quick emulator (QEMU) built with the Cirrus CLGD 54xx VGA emulator support is vulnerable to an out-of-bounds access issue. It could occur while copying VGA data via bitblt copy in backward mode. A privileged user inside a guest could use this flaw to crash the QEMU process resulting in DoS or potentially execute arbitrary code on the host with privileges of QEMU process on the host. (CVE-2017-2615)

  • Quick emulator (QEMU) built with the Cirrus CLGD 54xx VGA Emulator support is vulnerable to an out-of-bounds access issue. The issue could occur while copying VGA data in cirrus_bitblt_cputovideo. A privileged user inside guest could use this flaw to crash the QEMU process OR potentially execute arbitrary code on host with privileges of the QEMU process. (CVE-2017-2620)

  • An out-of-bounds read-access flaw was found in the QEMU emulator built with IP checksum routines. The flaw could occur when computing a TCP/UDP packet's checksum, because a QEMU function used the packet's payload length without checking against the data buffer's size. A user inside a guest could use this flaw to crash the QEMU process (denial of service). (CVE-2016-2857)

Red Hat would like to thank Wjjzhang (Tencent.com Inc.) and Li Qiang (360.cn Inc.) for reporting CVE-2017-2615 and Ling Liu (Qihoo 360 Inc.) for reporting CVE-2016-2857.

Bug Fix(es):

  • Prior to this update, after migrating a guest virtual machine on the little-endian variant of IBM Power Systems and resetting the guest, the guest boot process failed with a "tcmalloc: large alloc" error message. This update fixes the bug, and the described problem no longer occurs. (BZ#1420456)

  • The qemu-kvm-rhev package depends on the usbredir and libcacard packages. However, on the little-endian variant of IBM Power Systems, smartcard use is not supported and usbredir and libcacard are thus only available in the Optional channel. As a consequence, qemu-kvm-rhev was previously not installable on these systems if the Optional channel was not available for the user. This update removes usbredir and libcacard as dependencies of qemu-kvm-rhev on little-endian IBM Power Systems, and qemu-kvm-rhev can now be installed as expected in the described scenario. (BZ#1420428)

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

After installing this update, shut down all running virtual machines. Once all virtual machines have shut down, start them again for this update to take effect.

Affected Products

ProductVersionArch
Red Hat Virtualization4x86_64
Red Hat Virtualization3x86_64
Red Hat Virtualization for IBM Power LE4ppc64le
Red Hat Virtualization for IBM Power LE3ppc64le

Updated Packages

  • qemu-kvm-tools-rhev-2.6.0-28.el7_3.6.ppc64le.rpm
  • qemu-img-rhev-2.6.0-28.el7_3.6.ppc64le.rpm
  • qemu-kvm-common-rhev-2.6.0-28.el7_3.6.ppc64le.rpm
  • qemu-kvm-rhev-2.6.0-28.el7_3.6.x86_64.rpm
  • qemu-kvm-tools-rhev-2.6.0-28.el7_3.6.x86_64.rpm
  • qemu-kvm-rhev-2.6.0-28.el7_3.6.src.rpm
  • qemu-img-rhev-2.6.0-28.el7_3.6.x86_64.rpm
  • qemu-kvm-common-rhev-2.6.0-28.el7_3.6.x86_64.rpm
  • qemu-kvm-rhev-2.6.0-28.el7_3.6.ppc64le.rpm
  • qemu-kvm-rhev-debuginfo-2.6.0-28.el7_3.6.ppc64le.rpm
  • qemu-kvm-rhev-debuginfo-2.6.0-28.el7_3.6.x86_64.rpm

Fixes

CVEs

References

Additional information