Issued:
2017-05-09
Updated:
2017-05-09

RHSA-2017:1205 - Important: qemu-kvm-rhev security update

Synopsis

Important: qemu-kvm-rhev security 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-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

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):

  • A heap buffer overflow flaw was found in QEMU's Cirrus CLGD 54xx VGA emulator's VNC display driver support; the issue could occur when a VNC client attempted to update its display after a VGA operation is performed by a guest. A privileged user/process inside a guest could use this flaw to crash the QEMU process or, potentially, execute arbitrary code on the host with privileges of the QEMU process. (CVE-2016-9603)

  • Quick Emulator (QEMU) built with the Cirrus CLGD 54xx VGA Emulator support is vulnerable to an out-of-bounds r/w access issue. The vulnerability could occur while copying VGA data via various bitblt functions. A privileged user inside the guest could use this flaw to crash the QEMU process (DoS) or potentially execute arbitrary code on a host with privileges of the host's QEMU process. (CVE-2017-7980)

  • Quick Emulator (QEMU) built with the VNC display driver support is vulnerable to an out-of-bounds memory access issue. The vulnerability could occur while refreshing the VNC display surface area in the 'vnc_refresh_server_surface'. A user/process inside the guest could use this flaw to crash the QEMU process, resulting in a DoS. (CVE-2017-2633)

  • Quick Emulator (QEMU) built with the Cirrus CLGD 54xx VGA Emulator support is vulnerable to an out-of-bounds access issue. The vulnerability could occur while copying VGA data using bitblt functions (for example, cirrus_bitblt_rop_fwd_transp_). A privileged user inside a guest could use this flaw to crash the QEMU process, resulting in DoS. (CVE-2017-7718)

Red Hat would like to thank Jiangxin (PSIRT Huawei Inc.) Li Qiang (Qihoo 360 Gear Team) for reporting CVE-2017-7980 and Jiangxin (PSIRT Huawei Inc.) for reporting CVE-2017-7718.

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 Virtualization3x86_64

Updated Packages

  • qemu-kvm-rhev-debuginfo-0.12.1.2-2.503.el6_9.3.x86_64.rpm
  • qemu-kvm-rhev-0.12.1.2-2.503.el6_9.3.src.rpm
  • qemu-img-rhev-0.12.1.2-2.503.el6_9.3.x86_64.rpm
  • qemu-kvm-rhev-0.12.1.2-2.503.el6_9.3.x86_64.rpm
  • qemu-kvm-rhev-tools-0.12.1.2-2.503.el6_9.3.x86_64.rpm

Fixes

CVEs

References

Additional information