Issued:

2017-08-01

Updated:

2017-08-01

RHSA-2017:1856 - Moderate: qemu-kvm security, bug fix, and enhancement update

Synopsis

Moderate: qemu-kvm security, bug fix, and enhancement update

Type/Severity

Security Advisory Moderate

Topic

An update for qemu-kvm is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Moderate. 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 package provides the user-space component for running virtual machines that use KVM.

Security Fix(es):

• An out-of-bounds memory access issue was found in Quick Emulator (QEMU) in the VNC display driver. This flaw could occur while refreshing the VNC display surface area in the 'vnc_refresh_server_surface'. A user inside a guest could use this flaw to crash the QEMU process. (CVE-2017-2633)

• An integer overflow flaw was found in Quick Emulator (QEMU) in the CCID Card device support. The flaw could occur while passing messages via command/response packets to and from the host. A privileged user inside a guest could use this flaw to crash the QEMU process. (CVE-2017-5898)

• An information exposure flaw was found in Quick Emulator (QEMU) in Task Priority Register (TPR) optimizations for 32-bit Windows guests. The flaw could occur while accessing TPR. A privileged user inside a guest could use this issue to read portions of the host memory. (CVE-2016-4020)

Red Hat would like to thank Li Qiang (360.cn Inc.) for reporting CVE-2017-5898 and Donghai Zdh (Alibaba Inc.) for reporting CVE-2016-4020.

Additional Changes:

For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.4 Release Notes linked from the References section.

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

Updated Packages

• qemu-kvm-tools-1.5.3-141.el7.x86_64.rpm
• qemu-kvm-debuginfo-1.5.3-141.el7.x86_64.rpm
• qemu-kvm-debuginfo-1.5.3-141.el7.ppc64.rpm
• qemu-kvm-1.5.3-141.el7.src.rpm
• qemu-kvm-common-1.5.3-141.el7.x86_64.rpm
• qemu-img-1.5.3-141.el7.ppc64le.rpm
• qemu-kvm-1.5.3-141.el7.x86_64.rpm
• qemu-img-1.5.3-141.el7.x86_64.rpm
• qemu-img-1.5.3-141.el7.ppc64.rpm
• qemu-kvm-debuginfo-1.5.3-141.el7.ppc64le.rpm

Fixes

• This content is not included.BZ - 1151859
• This content is not included.BZ - 1299875
• This content is not included.BZ - 1313686
• This content is not included.BZ - 1342489
• This content is not included.BZ - 1361488
• This content is not included.BZ - 1375507
• This content is not included.BZ - 1377087
• This content is not included.BZ - 1377977
• This content is not included.BZ - 1378541
• This content is not included.BZ - 1419699
• This content is not included.BZ - 1419898
• This content is not included.BZ - 1425939
• This content is not included.BZ - 1427176
• This content is not included.BZ - 1430606
• This content is not included.BZ - 1433920
• This content is not included.BZ - 1436280
• This content is not included.BZ - 1440987
• This content is not included.BZ - 1441778
• This content is not included.BZ - 1451470
• This content is not included.BZ - 1452067
• This content is not included.BZ - 1456983

CVEs

• CVE-2016-4020
• CVE-2017-2633
• CVE-2017-5898

References

• https://access.redhat.com/security/updates/classification/#moderate
• https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/7.4_Release_Notes/index.html

Additional information

• The Red Hat security contact is This content is not included.secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.
• Offline Security Data data is available for integration with other systems. See Offline Security Data API to get started.