Issued:

2017-06-13

Updated:

2017-06-13

RHSA-2017:1430 - Important: qemu-kvm security and bug fix update

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 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

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 r/w access issue was found in QEMU's Cirrus CLGD 54xx VGA Emulator support. The vulnerability could occur while copying VGA data via various bitblt functions. A privileged user 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-2017-7980)

• An out-of-bounds access issue was found in QEMU's Cirrus CLGD 54xx VGA Emulator support. 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 denial of service. (CVE-2017-7718)

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

Bug Fix(es):

• Previously, guest virtual machines in some cases became unresponsive when the "pty" back end of a serial device performed an irregular I/O communication. This update improves the handling of serial I/O on guests, which prevents the described problem from occurring. (BZ#1452332)

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-img-1.5.3-126.el7_3.9.ppc64le.rpm
• qemu-kvm-1.5.3-126.el7_3.9.src.rpm
• qemu-kvm-debuginfo-1.5.3-126.el7_3.9.ppc64.rpm
• qemu-kvm-common-1.5.3-126.el7_3.9.x86_64.rpm
• qemu-kvm-debuginfo-1.5.3-126.el7_3.9.x86_64.rpm
• qemu-img-1.5.3-126.el7_3.9.ppc64.rpm
• qemu-kvm-tools-1.5.3-126.el7_3.9.x86_64.rpm
• qemu-kvm-debuginfo-1.5.3-126.el7_3.9.ppc64le.rpm
• qemu-kvm-1.5.3-126.el7_3.9.x86_64.rpm
• qemu-img-1.5.3-126.el7_3.9.x86_64.rpm

Fixes

• This content is not included.BZ - 1443441
• This content is not included.BZ - 1444371
• This content is not included.BZ - 1452332

CVEs

• CVE-2017-7718
• CVE-2017-7980

References

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

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.