[SECURITY] [DLA 689-1] qemu-kvm security update

Package : qemu-kvm
Version : 1.1.2+dfsg-6+deb7u18
CVE ID : CVE-2016-7909 CVE-2016-8909 CVE-2016-8910
Debian Bug : 839834 841950 841955 842455 842463

Multiple vulnerabilities have been discovered in qemu-kvm, a full
virtualization solution on x86 hardware based on Quick
Emulator(Qemu). The Common Vulnerabilities and Exposures project
identifies the following problems:

CVE-2016-7909

Quick Emulator(Qemu) built with the AMD PC-Net II emulator support is
vulnerable to an infinite loop issue. It could occur while receiving
packets via pcnet_receive().

A privileged user/process inside guest could use this issue to crash
the Qemu process on the host leading to DoS.

CVE-2016-8909

Quick Emulator(Qemu) built with the Intel HDA controller emulation support
is vulnerable to an infinite loop issue. It could occur while processing the
DMA buffer stream while doing data transfer in 'intel_hda_xfer'.

A privileged user inside guest could use this flaw to consume excessive CPU
cycles on the host, resulting in DoS.

CVE-2016-8910

Quick Emulator(Qemu) built with the RTL8139 ethernet controller emulation
support is vulnerable to an infinite loop issue. It could occur while
transmitting packets in C+ mode of operation.

A privileged user inside guest could use this flaw to consume
excessive CPU cycles on the host, resulting in DoS situation.

Further issues fixed where the CVE requests are pending:

• Quick Emulator(Qemu) built with the i8255x (PRO100) NIC emulation
  support is vulnerable to a memory leakage issue. It could occur while
  unplugging the device, and doing so repeatedly would result in leaking
  host memory affecting, other services on the host.

A privileged user inside guest could use this flaw to cause a DoS on the host
and/or potentially crash the Qemu process on the host.

• Quick Emulator(Qemu) built with the VirtFS, host directory sharing via
  Plan 9 File System(9pfs) support, is vulnerable to a several memory
  leakage issues.

A privileged user inside guest could use this flaw to leak the host
memory bytes resulting in DoS for other services.

• Quick Emulator(Qemu) built with the VirtFS, host directory sharing via
  Plan 9 File System(9pfs) support, is vulnerable to an integer overflow
  issue. It could occur by accessing xattributes values.

A privileged user inside guest could use this flaw to crash the Qemu
process instance resulting in DoS.

• Quick Emulator(Qemu) built with the VirtFS, host directory sharing via
  Plan 9 File System(9pfs) support, is vulnerable to memory leakage
  issue. It could occur while creating extended attribute via
  'Txattrcreate' message.

A privileged user inside guest could use this flaw to leak host
memory, thus affecting other services on the host and/or potentially
crash the Qemu process on the host.

For Debian 7 "Wheezy", these problems have been fixed in version
1.1.2+dfsg-6+deb7u18.

We recommend that you upgrade your qemu-kvm 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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