Synopsis

Important: qemu-kvm-rhev security update

Type/Severity

Security Advisory: Important

Topic

An update for qemu-kvm-rhev is now available for Red Hat Enterprise Linux OpenStack Platform 5.0 (Icehouse) 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):

• 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.

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 OpenStack 5.0 for RHEL 6 x86_64

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 - 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 OpenStack 5.0 for RHEL 6

SRPM
qemu-kvm-rhev-0.12.1.2-2.491.el6_8.7.src.rpm	SHA-256: c9dd41521ce59d7f17fcda7ffc910b3a740255f9bf0a3510d4b76363b82b7501
x86_64
qemu-img-rhev-0.12.1.2-2.491.el6_8.7.x86_64.rpm	SHA-256: 2d60a6bb095dc60c79a9b039bb3de853aee78a805c0ad52070ecb10ea98552d7
qemu-kvm-rhev-0.12.1.2-2.491.el6_8.7.x86_64.rpm	SHA-256: e21ad3f7d5de6383eab70d13a289c521e86416667812eedb41bbc85411c90fd2
qemu-kvm-rhev-debuginfo-0.12.1.2-2.491.el6_8.7.x86_64.rpm	SHA-256: 59b9e28f696b03d6354b38573ad0540549a92aad60df7071e2536cb5b38fddc9
qemu-kvm-rhev-tools-0.12.1.2-2.491.el6_8.7.x86_64.rpm	SHA-256: 347440666f17ad7bd2385ef8628ff43f8d5a75d063ccd82d370e93a831e9dbe1