[SECURITY] [DLA 845-1] qemu security update

Package : qemu
Version : 1.1.2+dfsg-6+deb7u20
CVE ID : CVE-2017-2615 CVE-2017-2620 CVE-2017-5898 CVE-2017-5973
Debian Bug :

Several vulnerabilities were discovered in qemu, a fast processor
emulator. The Common Vulnerabilities and Exposures project identifies
the following problems:

CVE-2017-2615

The Cirrus CLGD 54xx VGA Emulator in qemu 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 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-2017-2620

The Cirrus CLGD 54xx VGA Emulator in qemu is vulnerable to an
out-of-bounds access issue. It could occur while copying VGA data
in cirrus_bitblt_cputovideo.

A privileged user inside 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-2017-5898

The CCID Card device emulator support is vulnerable to an integer
overflow flaw. It could occur while passing message via
command/responses packets to and from the host.

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

CVE-2017-5973

The USB xHCI controller emulator support in qemu is vulnerable
to an infinite loop issue. It could occur while processing control
transfer descriptors' sequence in xhci_kick_epctx.

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

This update also updates the fix CVE-2016-9921 since it was too strict
and broke certain guests.

For Debian 7 "Wheezy", these problems have been fixed in version
1.1.2+dfsg-6+deb7u20.

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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