[SECURITY] [DLA 573-1] qemu security update

[Guido Günther <agx@sigxcpu.org>]

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Package        : qemu
Version        : 1.1.2+dfsg-6+deb7u14
CVE ID         : CVE-2015-5239 CVE-2016-2857 CVE-2016-4020 CVE-2016-4439 
                 CVE-2016-5403 CVE-2016-6351

Multiple vulnerabilities have been discovered in QEMU, a fast processor
emulator. The Common Vulnerabilities and Exposures project identifies
the following problems:

CVE-2015-5239

   Lian Yihan discovered that QEMU incorrectly handled certain payload
   messages in the VNC display driver. A malicious guest could use this
   issue to cause the QEMU process to hang, resulting in a denial of
   service.

CVE-2016-2857

   Ling Liu discovered that QEMU incorrectly handled IP checksum
   routines. An attacker inside the guest could use this issue to cause
   QEMU to crash, resulting in a denial of service, or possibly leak
   host memory bytes.

CVE-2016-4020

   Donghai Zdh discovered that QEMU incorrectly handled the Task
   Priority Register(TPR). A privileged attacker inside the guest could
   use this issue to possibly leak host memory bytes.

CVE-2016-4439, CVE-2016-6351

   Li Qiang disovered that the emulation of the 53C9X Fast SCSI
   Controller is affected by out of bound access issues.

CVE-2016-5403

   Zhenhao Hong discovered that a malicious guest administrator can
   cause unbounded memory allocation in QEMU (which can cause an
   Out-of-Memory condition) by submitting virtio requests without
   bothering to wait for completion.

For Debian 7 "Wheezy", these problems have been fixed in version
1.1.2+dfsg-6+deb7u14.

We recommend that you upgrade your qemu packages.

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
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