Bug 1842496 (CVE-2020-13659)

Summary:	CVE-2020-13659 QEMU: exec: address_space_map returns NULL without setting length to zero may lead to DoS
Product:	[Other] Security Response	Reporter:	Prasad Pandit <ppandit>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	amit, berrange, cfergeau, dwmw2, itamar, jen, jferlan, jforbes, jjoyce, jmaloy, jschluet, knoel, lhh, lpeer, m.a.young, mburns, mdeng, mkenneth, mrezanin, mst, pbonzini, ribarry, rjones, robinlee.sysu, sclewis, slinaber, virt-maint, virt-maint
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	QEMU 5.0.1	Doc Type:	If docs needed, set a value
Doc Text:	A NULL pointer dereference flaw 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 the host's virtual address space, may return NULL without setting the length parameter to zero (0). This flaw allows a guest user or process to crash the QEMU process on the host resulting in a denial of service.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-12-15 11:33:03 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1842498, 1842501, 1842502, 1842503, 1842504, 1842506, 1842507, 1910692
Bug Blocks:	1772801

Description Prasad Pandit 2020-06-01 12:04:34 UTC

A NULL pointer dereference issue was found in the MegaRAID SAS 8708EM2 emulatior 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
  -> https://www.openwall.com/lists/oss-security/2020/06/01/3

Comment 1 Prasad Pandit 2020-06-01 12:04:47 UTC

Acknowledgments:

Name: Alexander Bulekov

Comment 2 Prasad Pandit 2020-06-01 12:06:11 UTC

Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1842498]

Comment 7 Nick Tait 2021-03-02 20:18:05 UTC

Statement:

In Red Hat OpenStack Platform, because the flaw has a lower impact and the fix would require a substantial amount of development, no update will be provided at this time for the RHOSP qemu-kvm-rhev package.