oss-security - CVE-2020-13659 QEMU: exec: address_space_map returns NULL without setting length to zero may lead to DoS

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Message-ID: <nycvar.YSQ.7.77.849.2006011752180.62159@xnncv>
Date: Mon, 1 Jun 2020 17:54:06 +0530 (IST)
From: P J P <ppandit@...hat.com>
To: oss security list <oss-security@...ts.openwall.com>
cc: Alexander Bulekov <alxndr@...edu>
Subject: CVE-2020-13659 QEMU: exec: address_space_map returns NULL without
 setting length to zero may lead to DoS

   Hello,

A NULL pointer dereference issue was found in the MegaRAID SAS 8708EM2 
emulator of the QEMU. This issue occurs because the address_space_map() API 
while mapping physical memory into host's virtual address space may return 
NULL, without setting the length parameter to zero(0). A guest user/process 
may use this flaw to crash the QEMU process on the host resulting in DoS 
scenario.

Upstream patch:
---------------
   -> https://lists.gnu.org/archive/html/qemu-devel/2020-05/msg07313.html

Reference:
----------
   -> https://bugs.launchpad.net/qemu/+bug/1878259

Thank you.
--
Prasad J Pandit / Red Hat Product Security Team
8685 545E B54C 486B C6EB 271E E285 8B5A F050 DE8D

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