Synopsis

Important: qemu-kvm security and bug fix update

Type/Severity

Security Advisory: Important

Topic

An update for qemu-kvm is now available for Red Hat Enterprise Linux 6.

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

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

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)
  
• 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.) Li Qiang (360.cn Inc.) for reporting CVE-2017-2615 and Ling Liu (Qihoo 360 Inc.) for reporting CVE-2016-2857.

This update also fixes the following bug:

• Previously, rebooting a guest virtual machine more than 128 times in a short period of time caused the guest to shut down instead of rebooting, because the virtqueue was not cleaned properly. This update ensures that the virtqueue is cleaned more reliably, which prevents the described problem from occurring. (BZ#1408389)
  

All qemu-kvm users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. 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.

Solution

Before applying this update, make sure all previously released errata relevant to your system have been applied.

For details on how to apply this update, refer to:

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

Affected Products

• Red Hat Enterprise Linux Server 6 x86_64
• Red Hat Enterprise Linux Server 6 i386
• Red Hat Enterprise Linux Workstation 6 x86_64
• Red Hat Enterprise Linux Workstation 6 i386
• Red Hat Enterprise Linux Desktop 6 x86_64
• Red Hat Enterprise Linux Desktop 6 i386
• Red Hat Enterprise Linux for Power, big endian 6 ppc64
• Red Hat Enterprise Linux for Scientific Computing 6 x86_64

Fixes

• BZ - 1296567 - CVE-2016-2857 Qemu: net: out of bounds read in net_checksum_calculate()
• BZ - 1408389 - [RHEL6.8.z] KVM guest shuts itself down after 128th reboot
• BZ - 1418200 - CVE-2017-2615 Qemu: display: cirrus: oob access while doing bitblt copy backward mode

CVEs

• CVE-2016-2857
• CVE-2017-2615

References

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

Red Hat Enterprise Linux Server 6

SRPM
qemu-kvm-0.12.1.2-2.491.el6_8.6.src.rpm	SHA-256: b38dfb903626b96afba1c2d04ef9eb734e30e4fb5c620af7ccb5f23bc4960c7e
x86_64
qemu-guest-agent-0.12.1.2-2.491.el6_8.6.x86_64.rpm	SHA-256: 04ebd315be63eddba7db66297f3b198b6d8b404816f11c2e7eb13888770d07c8
qemu-img-0.12.1.2-2.491.el6_8.6.x86_64.rpm	SHA-256: e237a497c114168ee0b0ca2c86886bcefb27ab7f1c85ca6ae7533be4ef358035
qemu-kvm-0.12.1.2-2.491.el6_8.6.x86_64.rpm	SHA-256: eeb09e19afd02415c2a2aac93d7f307a351f0b3b295fb0906c4ae8a71ed2ccf0
qemu-kvm-debuginfo-0.12.1.2-2.491.el6_8.6.x86_64.rpm	SHA-256: 0aa81591355b29fa239446ae49c9c9acaae71b8eed0d5d44886468f3622310ae
qemu-kvm-tools-0.12.1.2-2.491.el6_8.6.x86_64.rpm	SHA-256: 3a30405ac89795d08b21fe360d4fca21d2c49e6b205d0082e2f16db6d86722bf
i386
qemu-guest-agent-0.12.1.2-2.491.el6_8.6.i686.rpm	SHA-256: 63e34a334277023213240477eddbd5a1b41fa318a13e29f95b92b7e66258d14e
qemu-kvm-debuginfo-0.12.1.2-2.491.el6_8.6.i686.rpm	SHA-256: 138027c5fb41a70cc860a5117c84571ce66cb2c626551557ce5ad97c36aa6658

Red Hat Enterprise Linux Workstation 6

SRPM
qemu-kvm-0.12.1.2-2.491.el6_8.6.src.rpm	SHA-256: b38dfb903626b96afba1c2d04ef9eb734e30e4fb5c620af7ccb5f23bc4960c7e
x86_64
qemu-guest-agent-0.12.1.2-2.491.el6_8.6.x86_64.rpm	SHA-256: 04ebd315be63eddba7db66297f3b198b6d8b404816f11c2e7eb13888770d07c8
qemu-img-0.12.1.2-2.491.el6_8.6.x86_64.rpm	SHA-256: e237a497c114168ee0b0ca2c86886bcefb27ab7f1c85ca6ae7533be4ef358035
qemu-kvm-0.12.1.2-2.491.el6_8.6.x86_64.rpm	SHA-256: eeb09e19afd02415c2a2aac93d7f307a351f0b3b295fb0906c4ae8a71ed2ccf0
qemu-kvm-debuginfo-0.12.1.2-2.491.el6_8.6.x86_64.rpm	SHA-256: 0aa81591355b29fa239446ae49c9c9acaae71b8eed0d5d44886468f3622310ae
qemu-kvm-tools-0.12.1.2-2.491.el6_8.6.x86_64.rpm	SHA-256: 3a30405ac89795d08b21fe360d4fca21d2c49e6b205d0082e2f16db6d86722bf
i386
qemu-guest-agent-0.12.1.2-2.491.el6_8.6.i686.rpm	SHA-256: 63e34a334277023213240477eddbd5a1b41fa318a13e29f95b92b7e66258d14e
qemu-kvm-debuginfo-0.12.1.2-2.491.el6_8.6.i686.rpm	SHA-256: 138027c5fb41a70cc860a5117c84571ce66cb2c626551557ce5ad97c36aa6658

Red Hat Enterprise Linux Desktop 6

SRPM
qemu-kvm-0.12.1.2-2.491.el6_8.6.src.rpm	SHA-256: b38dfb903626b96afba1c2d04ef9eb734e30e4fb5c620af7ccb5f23bc4960c7e
x86_64
qemu-guest-agent-0.12.1.2-2.491.el6_8.6.x86_64.rpm	SHA-256: 04ebd315be63eddba7db66297f3b198b6d8b404816f11c2e7eb13888770d07c8
qemu-img-0.12.1.2-2.491.el6_8.6.x86_64.rpm	SHA-256: e237a497c114168ee0b0ca2c86886bcefb27ab7f1c85ca6ae7533be4ef358035
qemu-kvm-0.12.1.2-2.491.el6_8.6.x86_64.rpm	SHA-256: eeb09e19afd02415c2a2aac93d7f307a351f0b3b295fb0906c4ae8a71ed2ccf0
qemu-kvm-debuginfo-0.12.1.2-2.491.el6_8.6.x86_64.rpm	SHA-256: 0aa81591355b29fa239446ae49c9c9acaae71b8eed0d5d44886468f3622310ae
qemu-kvm-tools-0.12.1.2-2.491.el6_8.6.x86_64.rpm	SHA-256: 3a30405ac89795d08b21fe360d4fca21d2c49e6b205d0082e2f16db6d86722bf
i386
qemu-guest-agent-0.12.1.2-2.491.el6_8.6.i686.rpm	SHA-256: 63e34a334277023213240477eddbd5a1b41fa318a13e29f95b92b7e66258d14e
qemu-kvm-debuginfo-0.12.1.2-2.491.el6_8.6.i686.rpm	SHA-256: 138027c5fb41a70cc860a5117c84571ce66cb2c626551557ce5ad97c36aa6658

Red Hat Enterprise Linux for Power, big endian 6

SRPM
qemu-kvm-0.12.1.2-2.491.el6_8.6.src.rpm	SHA-256: b38dfb903626b96afba1c2d04ef9eb734e30e4fb5c620af7ccb5f23bc4960c7e
ppc64
qemu-guest-agent-0.12.1.2-2.491.el6_8.6.ppc64.rpm	SHA-256: 2a55442206751f47746c75660cd3f5bcaeb8762ee3addce503472d3c770e20c9
qemu-kvm-debuginfo-0.12.1.2-2.491.el6_8.6.ppc64.rpm	SHA-256: 52c00458cef7820cac6cb293965b5aa7d80d47b1f909181d1db28154173280cc

Red Hat Enterprise Linux for Scientific Computing 6

SRPM
qemu-kvm-0.12.1.2-2.491.el6_8.6.src.rpm	SHA-256: b38dfb903626b96afba1c2d04ef9eb734e30e4fb5c620af7ccb5f23bc4960c7e
x86_64
qemu-guest-agent-0.12.1.2-2.491.el6_8.6.x86_64.rpm	SHA-256: 04ebd315be63eddba7db66297f3b198b6d8b404816f11c2e7eb13888770d07c8
qemu-img-0.12.1.2-2.491.el6_8.6.x86_64.rpm	SHA-256: e237a497c114168ee0b0ca2c86886bcefb27ab7f1c85ca6ae7533be4ef358035
qemu-kvm-0.12.1.2-2.491.el6_8.6.x86_64.rpm	SHA-256: eeb09e19afd02415c2a2aac93d7f307a351f0b3b295fb0906c4ae8a71ed2ccf0
qemu-kvm-debuginfo-0.12.1.2-2.491.el6_8.6.x86_64.rpm	SHA-256: 0aa81591355b29fa239446ae49c9c9acaae71b8eed0d5d44886468f3622310ae
qemu-kvm-tools-0.12.1.2-2.491.el6_8.6.x86_64.rpm	SHA-256: 3a30405ac89795d08b21fe360d4fca21d2c49e6b205d0082e2f16db6d86722bf