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

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Date: Wed, 19 Apr 2017 13:35:12 +0530 (IST)
From: P J P <ppandit@...hat.com>
To: oss security list <oss-security@...ts.openwall.com>
cc: Greg Kurz <groug@...d.org>
Subject: CVE-2017-7471 Qemu: 9p: virtfs allows guest to change filesystem
 attributes on host

   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
47AF CE69 3A90 54AA 9045 1053 DD13 3D32 FE5B 041F

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