Bug 1881409 (CVE-2020-25743)

Summary:	CVE-2020-25743 QEMU: ide: null pointer dereference while cancelling i/o operation
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:	ailan, berrange, cfergeau, drjones, imammedo, itamar, jen, jferlan, jforbes, jjoyce, jmaloy, jschluet, knoel, lhh, lpeer, m.a.young, mburns, mkenneth, mrezanin, mst, ondrejj, pbonzini, philmd, ribarry, rjones, robinlee.sysu, sclewis, slinaber, virt-maint, virt-maint, vkuznets, xen-maint
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	QEMU 5.1.1	Doc Type:	---
Doc Text:	A NULL pointer dereference flaw was found in the IDE disk emulator of QEMU. This issue occurs while canceling an I/O operation via the ide_cancel_dma_sync() routine if a block drive pointer is null. This flaw allows a guest user to crash the QEMU process on the host, resulting in a denial of service.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-12-15 12:06:54 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:	1883448, 1883449, 1883450, 1883451, 1883452, 1883453, 1883454, 1910670
Bug Blocks:	1850259

Description Prasad Pandit 2020-09-22 11:22:29 UTC

A null pointer dereference issue was found in the IDE disk emulator of QEMU. It could occur while cancelling an i/o operation via ide_cancel_dma_sync() routine, if a block drive pointer is null. A guest may use this flaw to crash the QEMU process on the host resulting in DoS scenario.

Upstream patch:
---------------
  -> https://lists.nongnu.org/archive/html/qemu-devel/2020-09/msg01568.html

Comment 1 Prasad Pandit 2020-09-22 11:22:43 UTC

Acknowledgments:

Name: Sergej Schumilo (Ruhr-University Bochum), Cornelius Aschermann (Ruhr-University Bochum), Simon Wrner (Ruhr-University Bochum)

Comment 2 Prasad Pandit 2020-09-22 11:22:50 UTC

External References:

https://www.openwall.com/lists/oss-security/2020/09/29/1
https://ruhr-uni-bochum.sciebo.de/s/NNWP2GfwzYKeKwE?path=%2Fide_nullptr1b

Comment 3 Prasad Pandit 2020-09-29 09:12:23 UTC

Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1883453]


Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1883454]

Comment 7 Nick Tait 2021-03-02 20:14:04 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.