Bug 1921846 (CVE-2021-20201)

Summary:	CVE-2021-20201 spice: Client initiated renegotiation denial of service
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	alon, cfergeau, hdegoede, jforbes, kraxel, marcandre.lureau, mkenneth, rh-spice-bugs, victortoso
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	spice 0.14.92	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in spice. A DoS tool might make it easier for remote attackers to cause a denial of service (CPU consumption) by performing many renegotiations within a single connection.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-05-18 20:38:17 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:	1904459, 1921847, 1929154
Bug Blocks:	1921851

Description Pedro Sampaio 2021-01-28 17:35:18 UTC

A issue was discovered in spice v0.14.91 and before. There is a DoS Vulnerability which might make it easier for remote attackers to cause a denial of service (CPU consumption) by performing many renegotiations within a single connection.

Upstream issue:

https://gitlab.freedesktop.org/spice/spice/-/issues/49

References:

https://blog.qualys.com/product-tech/2011/10/31/tls-renegotiation-and-denial-of-service-attacks

Comment 1 Pedro Sampaio 2021-01-28 17:35:49 UTC

Created spice tracking bugs for this issue:

Affects: fedora-all [bug 1921847]

Comment 5 Mauro Matteo Cascella 2021-02-16 10:31:17 UTC

Upstream commits:
https://gitlab.freedesktop.org/spice/spice/-/commit/95a0cfac8a1c8eff50f05e65df945da3bb501fc9
https://gitlab.freedesktop.org/spice/spice/-/commit/ca5bbc5692e052159bce1a75f55dc60b36078749

Comment 6 Mauro Matteo Cascella 2021-02-16 10:31:22 UTC

External References:

https://blog.qualys.com/product-tech/2011/10/31/tls-renegotiation-and-denial-of-service-attacks

Comment 9 errata-xmlrpc 2021-05-18 16:09:28 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:1924 https://access.redhat.com/errata/RHSA-2021:1924

Comment 10 Product Security DevOps Team 2021-05-18 20:38:17 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-2021-20201