Bug 1853154 (CVE-2020-15469)

Summary:	CVE-2020-15469 QEMU: MMIO ops null pointer dereference 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, drjones, dwmw2, itamar, jen, jferlan, jforbes, jjoyce, jlyle, jmaloy, jschluet, knoel, lhh, lpeer, m.a.young, mburns, 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 various system emulators of QEMU that occurs while performing MMIO r/w operations when the respective handler function is not defined. This flaw allows a privileged guest user to invoke the MMIO operation to crash the QEMU process on the host, resulting in a denial of service.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-12-15 12:04:30 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:	1853156, 1853157, 1853173, 1853175, 1853176, 1853177, 1853178, 1853183, 1853184, 1910685
Bug Blocks:	1727030

Description Prasad Pandit 2020-07-02 05:36:17 UTC

A NULL pointer dereference issue was found in various system emulators of QEMU. It could occur while performing MMIO r/w operations, in case the respective handler function is not defined. A privileged guest user able to invoke MMIO operation may use this flaw to crash the QEMU process on the host resulting in DoS scenario.

Upstream patch(es):
-------------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2020-06/msg09961.html

Reference:
----------
  -> https://www.openwall.com/lists/oss-security/2020/07/02/1

Comment 1 Prasad Pandit 2020-07-02 05:36:23 UTC

Acknowledgments:

Name: Lei Sun

Comment 2 Prasad Pandit 2020-07-02 05:36:54 UTC

Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1853156]


Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1853157]

Comment 6 Nick Tait 2021-03-02 20:16:51 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.