Bug 1879652 (CVE-2020-25084)

Summary:	CVE-2020-25084 QEMU: usb: use-after-free issue while setting up packet
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, yduan
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	A use-after-free flaw was found in the USB(xHCI/eHCI) controller emulators of QEMU. This flaw occurs while setting up the USB packet as a usb_packet_map() routine and returns an error that was not checked. 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:	2021-12-15 12:05:18 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:	1879653, 1879654, 1879656, 1879657, 1879658, 1879659, 1879660, 1879661, 1879662, 1879663, 1910679
Bug Blocks:	1850259

Description Prasad Pandit 2020-09-16 18:01:17 UTC

An use-after-free issue was found in USB(xHCI/eHCI) controller emulators of QEMU. It occurs while setting up USB packet, as usb_packet_map() routine may return an error, which was not checked. A guest user/process may use this flaw to crash the QEMU process resulting in DoS scenario.

Upstream patches:
-----------------
  -> https://lists.nongnu.org/archive/html/qemu-devel/2020-08/msg08050.html
  -> https://lists.nongnu.org/archive/html/qemu-devel/2020-08/msg08043.html

Reference:
----------
  -> https://www.openwall.com/lists/oss-security/2020/09/16/5

Comment 1 Prasad Pandit 2020-09-16 18:01:28 UTC

Acknowledgments:

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

Comment 2 Prasad Pandit 2020-09-16 18:01:32 UTC

External References:

https://ruhr-uni-bochum.sciebo.de/s/NNWP2GfwzYKeKwE?path=%2Fxhci_uaf_2

Comment 3 Prasad Pandit 2020-09-16 18:02:06 UTC

Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1879653]


Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1879654]

Comment 6 Nick Tait 2021-03-02 20:15:23 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.