Bug 1891668 (CVE-2020-27617)

Summary:	CVE-2020-27617 QEMU: net: an assert failure via eth_get_gso_type
Product:	[Other] Security Response	Reporter:	Prasad Pandit <ppandit>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	ailan, berrange, cfergeau, drjones, imammedo, itamar, jen, jferlan, jmaloy, knoel, mkenneth, mrezanin, mst, ondrejj, pbonzini, philmd, ribarry, rjones, 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 assert(3) failure flaw was found in the networking helper functions of QEMU. This vulnerability can occur in the eth_get_gso_type() routine if a packet does not have a valid networking L3 protocol (ex. IPv4, IPv6) value. 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:	2021-08-10 19:28:09 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:	1891669, 1892347, 1892348, 1892349, 1892350, 1894504, 1910668, 1939494
Bug Blocks:	1879504

Description Prasad Pandit 2020-10-27 03:15:56 UTC

An assert(3) failure issue was found in the networking helper functions of QEMU. It could occur in the eth_get_gso_type() routine, if a packet does not have a valid networking L3 protocol (ex. IPv4, IPv6) value. A guest user 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/2020-10/msg06023.html

Comment 1 Prasad Pandit 2020-10-27 03:16:03 UTC

Acknowledgments:

Name: Gaoning Pan (Zhejiang University)

Comment 2 Prasad Pandit 2020-10-27 03:22:43 UTC

Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1891669]

Comment 5 Prasad Pandit 2020-11-02 12:55:55 UTC

External References:

https://bugs.launchpad.net/qemu/+bug/1878067
https://www.openwall.com/lists/oss-security/2020/11/02/1

Comment 8 errata-xmlrpc 2021-08-10 13:50:10 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:3061 https://access.redhat.com/errata/RHSA-2021:3061

Comment 9 Product Security DevOps Team 2021-08-10 19:28:09 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-2020-27617