Bug 2007591 (CVE-2021-21238) - CVE-2021-21238 python-pysaml2: processing of invalid SAML XML documents
Summary: CVE-2021-21238 python-pysaml2: processing of invalid SAML XML documents
Alias: CVE-2021-21238
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 2007593 2007594 2007592 2009611 2009612
Blocks: 2007596
TreeView+ depends on / blocked
Reported: 2021-09-24 10:50 UTC by Marian Rehak
Modified: 2021-11-22 00:18 UTC (History)
13 users (show)

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.
Clone Of:
Last Closed: 2021-11-22 00:18:54 UTC

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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:


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 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):


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