[SECURITY] [DLA 1035-1] qemu security update

Package : qemu
Version : 1.1.2+dfsg-6+deb7u22
CVE ID : CVE-2016-9602 CVE-2016-9603 CVE-2017-7377 CVE-2017-7471
CVE-2017-7493 CVE-2017-7718 CVE-2017-7980 CVE-2017-8086

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

CVE-2016-9603

qemu-kvm built with the Cirrus CLGD 54xx VGA Emulator and the VNC
display driver support is vulnerable to a heap buffer overflow
issue.  It could occur when Vnc client attempts to update its
display after a vga operation is performed by a guest.

A privileged user/process inside guest could use this flaw to crash
the Qemu process resulting in DoS OR potentially leverage it to
execute arbitrary code on the host with privileges of the Qemu
process.

CVE-2017-7718

 qemu-kvm built with the Cirrus CLGD 54xx VGA Emulator support is
 vulnerable to an out-of-bounds access issue. It could occur while
 copying VGA data via bitblt functions cirrus_bitblt_rop_fwd_transp_
 and/or cirrus_bitblt_rop_fwd_.

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

CVE-2017-7980

 qemu-kvm built with the Cirrus CLGD 54xx VGA Emulator support is
 vulnerable to an out-of-bounds r/w access issues. It could occur
 while copying VGA data via various bitblt functions.

 A privileged user inside guest could use this flaw to crash the
 Qemu process resulting in DoS OR potentially execute arbitrary code
 on a host with privileges of Qemu process on the host.

CVE-2016-9602

Quick Emulator(Qemu) built with the VirtFS, host directory sharing via
Plan 9 File System(9pfs) support, is vulnerable to an improper link
following issue. It could occur while accessing symbolic link files
on a shared host directory.

A privileged user inside guest could use this flaw to access host file
system beyond the shared folder and potentially escalating their
privileges on a host.

CVE-2017-7377

Quick Emulator(Qemu) built with the virtio-9p back-end support is
vulnerable to a memory leakage issue. It could occur while doing a I/O
operation via v9fs_create/v9fs_lcreate routine.

A privileged user/process inside guest could use this flaw to leak
host memory resulting in Dos.

CVE-2017-7471

Quick Emulator(Qemu) built with the VirtFS, host directory sharing via
Plan 9 File System(9pfs) support, is vulnerable to an improper access
control issue. It could occur while accessing files on a shared host
directory.

A privileged user inside guest could use this flaw to access host file
system beyond the shared folder and potentially escalating their
privileges on a host.

CVE-2017-7493

Quick Emulator(Qemu) built with the VirtFS, host directory sharing via
Plan 9 File System(9pfs) support, is vulnerable to an improper access
control issue. It could occur while accessing virtfs metadata files
in mapped-file security mode.

A guest user could use this flaw to escalate their privileges inside
guest.

CVE-2017-8086

Quick Emulator(Qemu) built with the virtio-9p back-end support is
vulnerable to a memory leakage issue. It could occur while querying
file system extended attributes via 9pfs_list_xattr() routine.

A privileged user/process inside guest could use this flaw to leak
host memory resulting in Dos.

For Debian 7 "Wheezy", these problems have been fixed in version
1.1.2+dfsg-6+deb7u22.

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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