Bug 1894036 (CVE-2020-27616)

Summary:	CVE-2020-27616 QEMU: ati-vga: potential crash via invalid x y parameter values
Product:	[Other] Security Response	Reporter:	Prasad Pandit <ppandit>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	ailan, berrange, cfergeau, drjones, imammedo, itamar, jen, jferlan, jforbes, jmaloy, knoel, m.a.young, mkenneth, mrezanin, mst, ondrejj, pbonzini, philmd, ribarry, rjones, robinlee.sysu, virt-maint, virt-maint, vkuznets, xen-maint
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	QEMU 5.2.0	Doc Type:	---
Doc Text:	An out-of-bounds access flaw was found in the ati-vga emulator of the QEMU. This flaw occurs when the source and destination x y display parameters in ati_2d_blt() have invalid values. This flaw allows a guest user or process to crash the QEMU process, resulting in a denial of service.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-11-03 14:21:16 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:	1894037, 1910664
Bug Blocks:	1880559

Description Prasad Pandit 2020-11-03 11:53:15 UTC

An out-of-bounds access issue was found in the ati-vga emulator of the QEMU. It could occur when the source and destination x,y display parameters in ati_2d_blt() have invalid values. A guest user/process may use this flaw to crash the QEMU process resulting in DoS scenario.

Upstream patch:
---------------
  -> https://lists.nongnu.org/archive/html/qemu-devel/2020-10/msg06080.html

Comment 1 Prasad Pandit 2020-11-03 11:53:25 UTC

Acknowledgments:

Name: Gaoning Pan (Zhejiang University)

Comment 2 Prasad Pandit 2020-11-03 11:54:28 UTC

Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1894037]

Comment 3 Prasad Pandit 2020-11-03 12:09:39 UTC

External References:

https://www.openwall.com/lists/oss-security/2020/11/03/2

Comment 4 Product Security DevOps Team 2020-11-03 14:21:16 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2020-27616