CVE-2017-7471 Qemu: 9p: virtfs allows guest to change filesystem attributes on host

[P J P <ppandit () redhat com>]

  Hello,

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.

Upstream patches:
-----------------
  -> http://git.qemu-project.org/?p=qemu.git;a=commitdiff;h=9c6b899f7a46893ab3b671e341a2234e9c0c060e

Reference:
----------
  -> https://bugzilla.redhat.com/show_bug.cgi?id=1443401


'CVE-2017-7471' has been assigned to it by Red Hat Inc.

Thank you.
--
Prasad J Pandit / Red Hat Product Security Team
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