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

• Red Hat Virtualization 4 for RHEL 7 x86_64
• Red Hat Virtualization 3 for RHEL 7 x86_64
• Red Hat Virtualization for IBM Power LE 4 for RHEL 7 ppc64le
• Red Hat Virtualization for IBM Power LE 3 ppc64le

Fixes

• BZ - 1296567 - CVE-2016-2857 Qemu: net: out of bounds read in net_checksum_calculate()
• BZ - 1418200 - CVE-2017-2615 Qemu: display: cirrus: oob access while doing bitblt copy backward mode
• BZ - 1420428 - Remove dependencies required by spice on ppc64le
• BZ - 1420456 - [ppc64le]reset vm when do migration, HMP in src host promp "tcmalloc: large alloc 1073872896 bytes..."
• BZ - 1420484 - CVE-2017-2620 Qemu: display: cirrus: potential arbitrary code execution via cirrus_bitblt_cputovideo

CVEs

• CVE-2016-2857
• CVE-2017-2615
• CVE-2017-2620

References

• https://access.redhat.com/security/updates/classification/#important

Red Hat Virtualization 4 for RHEL 7

SRPM
qemu-kvm-rhev-2.6.0-28.el7_3.6.src.rpm	SHA-256: 8fa1c5d4f5cb2d6195a7df93e917efadb5696e8032b5cd7ebdade993ca640d12
x86_64
qemu-img-rhev-2.6.0-28.el7_3.6.x86_64.rpm	SHA-256: 8d48714c227dd1f8f21055f6a325f054166d16ca8590d4e87ee44672975ec5ec
qemu-kvm-common-rhev-2.6.0-28.el7_3.6.x86_64.rpm	SHA-256: 9b8e93e436862bab8b4493df06bf8162146435e04fe56bc52e2baafb7876c750
qemu-kvm-rhev-2.6.0-28.el7_3.6.x86_64.rpm	SHA-256: 8fbbb6f7c2da1bca7b63bb35f7bed7549ddfe5e86bc61421588f0f8e471b9359
qemu-kvm-rhev-debuginfo-2.6.0-28.el7_3.6.x86_64.rpm	SHA-256: 02ae2c065b8a4fd3fcbb0b9db1d90be61b3a56fb29b788082723c74e8ee854a9
qemu-kvm-tools-rhev-2.6.0-28.el7_3.6.x86_64.rpm	SHA-256: 4eda31539e4e241bf5d26272d7b093556cb35b9bd4cbf5614da09690f27be2d1

Red Hat Virtualization 3 for RHEL 7

SRPM
qemu-kvm-rhev-2.6.0-28.el7_3.6.src.rpm	SHA-256: 8fa1c5d4f5cb2d6195a7df93e917efadb5696e8032b5cd7ebdade993ca640d12
x86_64
qemu-img-rhev-2.6.0-28.el7_3.6.x86_64.rpm	SHA-256: 8d48714c227dd1f8f21055f6a325f054166d16ca8590d4e87ee44672975ec5ec
qemu-kvm-common-rhev-2.6.0-28.el7_3.6.x86_64.rpm	SHA-256: 9b8e93e436862bab8b4493df06bf8162146435e04fe56bc52e2baafb7876c750
qemu-kvm-rhev-2.6.0-28.el7_3.6.x86_64.rpm	SHA-256: 8fbbb6f7c2da1bca7b63bb35f7bed7549ddfe5e86bc61421588f0f8e471b9359
qemu-kvm-rhev-debuginfo-2.6.0-28.el7_3.6.x86_64.rpm	SHA-256: 02ae2c065b8a4fd3fcbb0b9db1d90be61b3a56fb29b788082723c74e8ee854a9
qemu-kvm-tools-rhev-2.6.0-28.el7_3.6.x86_64.rpm	SHA-256: 4eda31539e4e241bf5d26272d7b093556cb35b9bd4cbf5614da09690f27be2d1

Red Hat Virtualization for IBM Power LE 4 for RHEL 7

SRPM
qemu-kvm-rhev-2.6.0-28.el7_3.6.src.rpm	SHA-256: 8fa1c5d4f5cb2d6195a7df93e917efadb5696e8032b5cd7ebdade993ca640d12
ppc64le
qemu-img-rhev-2.6.0-28.el7_3.6.ppc64le.rpm	SHA-256: 40f0574542c699bd2d40698e7b35cf246798be62c2a7339e48b0ccfb1d7bef1d
qemu-kvm-common-rhev-2.6.0-28.el7_3.6.ppc64le.rpm	SHA-256: 1d5cd4f121b038127e3a67f40b29d55d75739358b9b3e738b1349a270b92accd
qemu-kvm-rhev-2.6.0-28.el7_3.6.ppc64le.rpm	SHA-256: 0cec8216c77c43e6bf2b054e96aec1f13ac300feac1bf38b1fb5fef6135af76f
qemu-kvm-rhev-debuginfo-2.6.0-28.el7_3.6.ppc64le.rpm	SHA-256: aa35e1fb48ada6695a42853d059d70e2fb5f2f0b1d11bc1dddc0cd15917737a2
qemu-kvm-tools-rhev-2.6.0-28.el7_3.6.ppc64le.rpm	SHA-256: bf5dee71b0422713b31c536ca24e2e1af37d8da76e089f4c1af70dcabf29ef82

Red Hat Virtualization for IBM Power LE 3

SRPM
qemu-kvm-rhev-2.6.0-28.el7_3.6.src.rpm	SHA-256: 8fa1c5d4f5cb2d6195a7df93e917efadb5696e8032b5cd7ebdade993ca640d12
ppc64le
qemu-img-rhev-2.6.0-28.el7_3.6.ppc64le.rpm	SHA-256: 40f0574542c699bd2d40698e7b35cf246798be62c2a7339e48b0ccfb1d7bef1d
qemu-kvm-common-rhev-2.6.0-28.el7_3.6.ppc64le.rpm	SHA-256: 1d5cd4f121b038127e3a67f40b29d55d75739358b9b3e738b1349a270b92accd
qemu-kvm-rhev-2.6.0-28.el7_3.6.ppc64le.rpm	SHA-256: 0cec8216c77c43e6bf2b054e96aec1f13ac300feac1bf38b1fb5fef6135af76f
qemu-kvm-rhev-debuginfo-2.6.0-28.el7_3.6.ppc64le.rpm	SHA-256: aa35e1fb48ada6695a42853d059d70e2fb5f2f0b1d11bc1dddc0cd15917737a2
qemu-kvm-tools-rhev-2.6.0-28.el7_3.6.ppc64le.rpm	SHA-256: bf5dee71b0422713b31c536ca24e2e1af37d8da76e089f4c1af70dcabf29ef82