Bug 1922441 (CVE-2021-20203)

Summary:	CVE-2021-20203 qemu: Failed malloc in vmxnet3_activate_device() in hw/net/vmxnet3.c
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
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, ppandit, ribarry, rjones, robinlee.sysu, security-response-team, virt-maint, virt-maint, vkuznets, xen-maint
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	An integer overflow flaw was found in the vmxnet3 NIC emulator of QEMU. This issue occurs when a guest supplies invalid values for the rx/tx queue size or other NIC parameters. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-01-31 08:41:42 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:	1922719
Bug Blocks:	1905617

Description Pedro Sampaio 2021-01-29 17:55:15 UTC

An integer overflow issue was found in the vmxnet3 NIC emulator of the QEMU. It may occur if a guest was to supply invalid values for rx/tx queue size or other NIC parameters. A privileged guest user 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/2021-01/msg07935.html

Comment 1 Prasad Pandit 2021-01-31 04:21:46 UTC

Acknowledgments:

Name: Gaoning Pan (Zhejiang University & Ant Security Light-Year Lab)

Comment 2 Prasad Pandit 2021-01-31 04:21:50 UTC

Statement:

This issue does not affect the versions of the qemu-kvm package as shipped with Red Hat Enterprise Linux 5, 6, 7 and 8.

Comment 3 Prasad Pandit 2021-01-31 04:21:53 UTC

External References:

https://bugs.launchpad.net/qemu/+bug/1913873

Comment 4 Prasad Pandit 2021-01-31 04:28:42 UTC

Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1922719]

Comment 5 Product Security DevOps Team 2021-01-31 08:41:42 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-2021-20203

Comment 8 Philippe Mathieu-Daudé 2021-11-19 12:34:19 UTC

Fixed by https://gitlab.com/qemu-project/qemu/-/commit/d05dcd94aee88