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Date: Sun, 30 Oct 2016 15:42:59 -0400
From: <cve-assign@...re.org>
To: <ppandit@...hat.com>
CC: <cve-assign@...re.org>, <oss-security@...ts.openwall.com>,
	<liqiang6-s@....cn>
Subject: Re: CVE request Qemu: 9pfs: integer overflow leading to OOB access

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> 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.
> 
> https://lists.gnu.org/archive/html/qemu-devel/2016-10/msg02942.html

>> Fix this by comparing the offset and the xattr size, which are
>> both uint64_t, before trying to compute the effective number of bytes
>> to read or write.

Use CVE-2016-9104.

This is not yet available at
http://git.qemu.org/?p=qemu.git;a=history;f=hw/9pfs/9p.c but
that may be an expected place for a later update.

- -- 
CVE Assignment Team
M/S M300, 202 Burlington Road, Bedford, MA 01730 USA
[ A PGP key is available for encrypted communications at
  http://cve.mitre.org/cve/request_id.html ]
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