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Sicherheit: Denial of Service in QEMU
Aktuelle Meldungen Distributionen
Name: Denial of Service in QEMU
ID: RHSA-2017:0083-01
Distribution: Red Hat
Plattformen: Red Hat Enterprise Linux
Datum: Di, 17. Januar 2017, 23:22
Referenzen: https://access.redhat.com/security/cve/CVE-2016-2857

Originalnachricht

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=====================================================================
Red Hat Security Advisory

Synopsis: Low: qemu-kvm security and bug fix update
Advisory ID: RHSA-2017:0083-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2017-0083.html
Issue date: 2017-01-17
CVE Names: CVE-2016-2857
=====================================================================

1. Summary:

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 Low. 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.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Client (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64
Red Hat Enterprise Linux Server (v. 7) - ppc64, ppc64le, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - x86_64

3. Description:

Kernel-based Virtual Machine (KVM) is a full virtualization solution for
Linux on AMD64 and Intel 64 systems. The qemu-kvm packages provide the
user-space component for running virtual machines using KVM.

Security Fix(es):

* 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 Ling Liu (Qihoo 360 Inc.) for reporting this
issue.

Bug Fix(es):

* Previously, rebooting a guest virtual machine more than 128 times in a
short period of time caused the guest to shut down instead of rebooting,
because the virtqueue was not cleaned properly. This update ensures that
the virtqueue is cleaned more reliably, which prevents the described
problem from occurring. (BZ#1393484)

4. 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.

5. Bugs fixed (https://bugzilla.redhat.com/):

1296567 - CVE-2016-2857 Qemu: net: out of bounds read in
net_checksum_calculate()

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
qemu-kvm-1.5.3-126.el7_3.3.src.rpm

x86_64:
qemu-img-1.5.3-126.el7_3.3.x86_64.rpm
qemu-kvm-1.5.3-126.el7_3.3.x86_64.rpm
qemu-kvm-common-1.5.3-126.el7_3.3.x86_64.rpm
qemu-kvm-debuginfo-1.5.3-126.el7_3.3.x86_64.rpm
qemu-kvm-tools-1.5.3-126.el7_3.3.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional (v. 7):

Source:
qemu-kvm-1.5.3-126.el7_3.3.src.rpm

x86_64:
qemu-img-1.5.3-126.el7_3.3.x86_64.rpm
qemu-kvm-1.5.3-126.el7_3.3.x86_64.rpm
qemu-kvm-common-1.5.3-126.el7_3.3.x86_64.rpm
qemu-kvm-debuginfo-1.5.3-126.el7_3.3.x86_64.rpm
qemu-kvm-tools-1.5.3-126.el7_3.3.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
qemu-kvm-1.5.3-126.el7_3.3.src.rpm

ppc64:
qemu-img-1.5.3-126.el7_3.3.ppc64.rpm
qemu-kvm-debuginfo-1.5.3-126.el7_3.3.ppc64.rpm

ppc64le:
qemu-img-1.5.3-126.el7_3.3.ppc64le.rpm
qemu-kvm-debuginfo-1.5.3-126.el7_3.3.ppc64le.rpm

x86_64:
qemu-img-1.5.3-126.el7_3.3.x86_64.rpm
qemu-kvm-1.5.3-126.el7_3.3.x86_64.rpm
qemu-kvm-common-1.5.3-126.el7_3.3.x86_64.rpm
qemu-kvm-debuginfo-1.5.3-126.el7_3.3.x86_64.rpm
qemu-kvm-tools-1.5.3-126.el7_3.3.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
qemu-kvm-1.5.3-126.el7_3.3.src.rpm

x86_64:
qemu-img-1.5.3-126.el7_3.3.x86_64.rpm
qemu-kvm-1.5.3-126.el7_3.3.x86_64.rpm
qemu-kvm-common-1.5.3-126.el7_3.3.x86_64.rpm
qemu-kvm-debuginfo-1.5.3-126.el7_3.3.x86_64.rpm
qemu-kvm-tools-1.5.3-126.el7_3.3.x86_64.rpm

These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2016-2857
https://access.redhat.com/security/updates/classification/#low
https://access.redhat.com/security/updates/classification/#Low

8. Contact:

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

Copyright 2017 Red Hat, Inc.
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