Bug 2007591 (CVE-2021-21238)

Summary:	CVE-2021-21238 python-pysaml2: processing of invalid SAML XML documents
Product:	[Other] Security Response	Reporter:	Marian Rehak <mrehak>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	apevec, apevec, dbecker, jjoyce, jschluet, lhh, lpeer, mburns, nkinder, openstack-sig, rhos-maint, sclewis, slinaber
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	python-pysaml2 6.5.0	Doc Type:	If docs needed, set a value
Doc Text:	A verification flaw was found in python-pysaml2, where it did not validate signed SAML documents against an XML schema. Because the flaw allowed invalid XML documents to be processed, a network attacker could exploit this flaw by tricking pysaml2 with a wrapped signature.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-11-22 00:18:54 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:	2007593, 2007592, 2007594, 2009611, 2009612
Bug Blocks:	2007596

Description Marian Rehak 2021-09-24 10:50:23 UTC

Improper verification of cryptographic signature vulnerability. All users of pysaml2 that need to validate signed SAML documents are impacted. The vulnerability is a variant of XML Signature wrapping because it did not validate the SAML document against an XML schema. This allowed invalid XML documents to be processed and such a document can trick pysaml2 with a wrapped signature. This is fixed in PySAML2 6.5.0.

Upstream Advisory:

https://github.com/IdentityPython/pysaml2/security/advisories/GHSA-f4g9-h89h-jgv9

Comment 1 Marian Rehak 2021-09-24 10:51:04 UTC

Created python-pysaml2 tracking bugs for this issue:

Affects: epel-8 [bug 2007593]
Affects: fedora-all [bug 2007592]
Affects: openstack-rdo [bug 2007594]

Comment 2 Summer Long 2021-10-01 03:18:40 UTC

Upstream fix: https://github.com/IdentityPython/pysaml2/commit/3b707723dcf1bf60677b424aac398c0c3557641d

Comment 5 Product Security DevOps Team 2021-11-22 00:18:52 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-2021-21238