oss-security - CVE-2017-11334 Qemu: exec: oob access during dma operation

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Message-ID: <alpine.LFD.2.20.1707171312030.16715@wniryva>
Date: Mon, 17 Jul 2017 13:14:43 +0530 (IST)
From: P J P <ppandit@...hat.com>
To: oss security list <oss-security@...ts.openwall.com>
cc: Alex <broscutamaker@...il.com>
Subject: CVE-2017-11334 Qemu: exec: oob access during dma operation

   Hello,

Qemu emulator built to use 'qemu_map_ram_ptr' to access guests' ram block area 
is vulnerable to a OOB r/w access issue. It could occur during a DMA 
operation.

A privileged user inside guest could use this flaw to crash the guest instance 
resulting in DoS.

Upstream patch:
---------------
   -> https://lists.gnu.org/archive/html/qemu-devel/2017-07/msg03775.html

Reference:
----------
   -> https://bugzilla.redhat.com/show_bug.cgi?id=1471638

This issue was reported by Mr Alex.

Thank you.
--
Prasad J Pandit / Red Hat Product Security Team
47AF CE69 3A90 54AA 9045 1053 DD13 3D32 FE5B 041F

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