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Date: Tue,  6 Sep 2016 20:53:20 -0400 (EDT)
From: cve-assign@...re.org
To: ppandit@...hat.com
Cc: cve-assign@...re.org, oss-security@...ts.openwall.com, liqiang6-s@....cn, vv474172261@...il.com
Subject: Re: CVE request: Qemu: scsi: pvscsi: OOB read and infinite loop while setting descriptor rings

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> Quick Emulator(Qemu) built with the VMWARE PVSCSI paravirtual SCSI bus
> emulation support is vulnerable to an OOB access and/or infinite loop issue.
> It could occur while processing SCSI commands 'PVSCSI_CMD_SETUP_RINGS'.
> 
> A privileged user inside guest could use this flaw to crash the Qemu process
> resulting in DoS.
> 
> https://lists.gnu.org/archive/html/qemu-devel/2016-09/msg00050.html
> https://bugzilla.redhat.com/show_bug.cgi?id=1373462

>> Vmware Paravirtual SCSI emulation uses command descriptors to
>> process SCSI commands. These descriptors come with their ring
>> buffers. A guest could set the page count for these rings to
>> an arbitrary value, leading to infinite loop or OOB access.
>> Add check to avoid it.

Use CVE-2016-7155.

This is not yet available at
http://git.qemu.org/?p=qemu.git;a=history;f=hw/scsi/vmw_pvscsi.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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