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Date: Thu, 26 May 2016 14:26:09 -0400 (EDT)
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: scsi: megasas: out-of-bounds read in megasas_lookup_frame() function

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> Quick Emulator(Qemu) built with the MegaRAID SAS 8708EM2 Host Bus Adapter
> emulation support is vulnerable to an out-of-bounds read access issue. It
> could occur while looking up MegaRAID Firmware Interface(MFI) command frames
> in 'megasas_lookup_frame' routine.
> 
> A privileged user inside guest could use this flaw to read invalid memory
> leading to crash the Qemu process on the host.
> 
> https://lists.gnu.org/archive/html/qemu-devel/2016-05/msg04424.html
> https://bugzilla.redhat.com/show_bug.cgi?id=1336461

>> While doing MegaRAID SAS controller command frame lookup, routine
>> 'megasas_lookup_frame' uses 'read_queue_head' value as an index
>> into 'frames[MEGASAS_MAX_FRAMES=2048]' array. Limit its value
>> within array bounds to avoid any OOB access.

Use CVE-2016-5107.

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