Bug 1995112 (CVE-2021-39242)

Summary:	CVE-2021-39242 haproxy: it can lead to a situation with an attacker-controlled HTTP Host header because a mismatch between Host and authority is mishandled
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	bmontgom, bperkins, eparis, hhorak, jburrell, jeremy, jokerman, jorton, nstielau, pavloos, rohara, sponnaga, vkumar
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	haproxy 2.4.3, haproxy 2.3.13, haproxy 2.2.16	Doc Type:	If docs needed, set a value
Doc Text:	haproxy was found to be vulnerable to HTTP host header attack: This problem creates a scenario in which it's possible to drop the Host header and use the authority only after forwarding to a second http2 layer, possibly causing two differing values of Host at a different stage. The highest threat from this vulnerability is data integrity.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-11-10 20:58:41 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:	1995113, 1998200, 2001963, 2001965, 2002703, 2003162, 2019913
Bug Blocks:	1993521

Description Guilherme de Almeida Suckevicz 2021-08-18 13:21:31 UTC

An issue was discovered in HAProxy 2.2 before 2.2.16, 2.3 before 2.3.13, and 2.4 before 2.4.3. It can lead to a situation with an attacker-controlled HTTP Host header, because a mismatch between Host and authority is mishandled.

Reference:
https://www.mail-archive.com/haproxy@formilux.org/msg41041.html

Upstream patch:
https://git.haproxy.org/?p=haproxy.git;a=commit;h=b5d2b9e154d78e4075db163826c5e0f6d31b2ab1

Comment 1 Guilherme de Almeida Suckevicz 2021-08-18 13:21:49 UTC

Created haproxy tracking bugs for this issue:

Affects: fedora-all [bug 1995113]

Comment 4 errata-xmlrpc 2021-11-10 20:49:39 UTC

This issue has been addressed in the following products:

  Red Hat OpenShift Container Platform 4.9

Via RHSA-2021:4118 https://access.redhat.com/errata/RHSA-2021:4118

Comment 5 Product Security DevOps Team 2021-11-10 20:58:39 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-2021-39242

Comment 6 errata-xmlrpc 2022-01-05 15:44:16 UTC

This issue has been addressed in the following products:

  Red Hat OpenShift Container Platform 4.8

Via RHSA-2021:5208 https://access.redhat.com/errata/RHSA-2021:5208