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Red Hat Product Errata RHSA-2016:1943 - Security Advisory
Issued:
2016-09-27
Updated:
2016-09-27

RHSA-2016:1943 - Security Advisory

  • Overview
  • Updated Packages

Synopsis

Important: kvm security update

Type/Severity

Security Advisory: Important

Red Hat Insights patch analysis

Identify and remediate systems affected by this advisory.

View affected systems

Topic

An update for kvm is now available for Red Hat Enterprise Linux 5.

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 (for Kernel-based Virtual Machine) is a full virtualization solution for
Linux on x86 hardware. Using KVM, one can run multiple virtual machines running
unmodified Linux or Windows images. Each virtual machine has private virtualized
hardware: a network card, disk, graphics adapter, etc.

Security Fix(es):

  • An out-of-bounds read/write access flaw was found in the way QEMU's VGA

emulation with VESA BIOS Extensions (VBE) support performed read/write
operations using I/O port methods. A privileged guest user could use this flaw
to execute arbitrary code on the host with the privileges of the host's QEMU
process. (CVE-2016-3710)

  • Quick Emulator(QEMU) built with the virtio framework is vulnerable to an

unbounded memory allocation issue. It was found that a malicious guest user
could submit more requests than the virtqueue size permits. Processing a request
allocates a VirtQueueElement results in unbounded memory allocation on the host
controlled by the guest. (CVE-2016-5403)

Red Hat would like to thank Wei Xiao (360 Marvel Team) and Qinghao Tang (360
Marvel Team) for reporting CVE-2016-3710 and hongzhenhao (Marvel Team) for
reporting CVE-2016-5403.

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

Note: The procedure in the Solution section must be performed before this update
will take effect.

Affected Products

  • Red Hat Enterprise Linux Server 5 x86_64
  • Red Hat Enterprise Linux Workstation 5 x86_64

Fixes

  • BZ - 1331401 - CVE-2016-3710 qemu: incorrect banked access bounds checking in vga module
  • BZ - 1358359 - CVE-2016-5403 Qemu: virtio: unbounded memory allocation on host via guest leading to DoS

CVEs

  • CVE-2016-3710
  • CVE-2016-5403

References

  • https://access.redhat.com/security/updates/classification/#important
Note: More recent versions of these packages may be available. Click a package name for more details.

Red Hat Enterprise Linux Server 5

SRPM
kvm-83-276.el5_11.src.rpm SHA-256: bee01bdf5d0265082a898780154cfdccacdf5c08a77c1fbcc531f86fc0167bd9
x86_64
kmod-kvm-83-276.el5_11.x86_64.rpm SHA-256: c66d341ccba983fdd9609806746975de54133b6ef8284a8aac343e33219d734a
kmod-kvm-debug-83-276.el5_11.x86_64.rpm SHA-256: f8efd16e180a182604754d74f56baa86989c66248dfe9539d1a37c5e03828b80
kvm-83-276.el5_11.x86_64.rpm SHA-256: 0bf2bbdcbe0b8f3dad3533a644eeb3b275087468c1044c46490d5510774108ae
kvm-debuginfo-83-276.el5_11.x86_64.rpm SHA-256: 4bef7af13a7f6bba4cc137211d2d50b082ed66dc6373cc1cea10332a464fda31
kvm-qemu-img-83-276.el5_11.x86_64.rpm SHA-256: bef7e25d66d9d2363932a464f7e9d9370bc15dc5f247eee02c49455d7bbb36fe
kvm-tools-83-276.el5_11.x86_64.rpm SHA-256: e42334787afae25919b24ddba3228aa032ed5adf6b7e54b6ef07686f8883bc92

Red Hat Enterprise Linux Workstation 5

SRPM
kvm-83-276.el5_11.src.rpm SHA-256: bee01bdf5d0265082a898780154cfdccacdf5c08a77c1fbcc531f86fc0167bd9
x86_64
kmod-kvm-83-276.el5_11.x86_64.rpm SHA-256: c66d341ccba983fdd9609806746975de54133b6ef8284a8aac343e33219d734a
kmod-kvm-debug-83-276.el5_11.x86_64.rpm SHA-256: f8efd16e180a182604754d74f56baa86989c66248dfe9539d1a37c5e03828b80
kvm-83-276.el5_11.x86_64.rpm SHA-256: 0bf2bbdcbe0b8f3dad3533a644eeb3b275087468c1044c46490d5510774108ae
kvm-debuginfo-83-276.el5_11.x86_64.rpm SHA-256: 4bef7af13a7f6bba4cc137211d2d50b082ed66dc6373cc1cea10332a464fda31
kvm-qemu-img-83-276.el5_11.x86_64.rpm SHA-256: bef7e25d66d9d2363932a464f7e9d9370bc15dc5f247eee02c49455d7bbb36fe
kvm-tools-83-276.el5_11.x86_64.rpm SHA-256: e42334787afae25919b24ddba3228aa032ed5adf6b7e54b6ef07686f8883bc92

The Red Hat security contact is secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.

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