CVE-2021-21239

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Summary

CVECVE-2021-21239
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-01-21 15:15:00 UTC
Updated2021-03-10 21:00:00 UTC
DescriptionPySAML2 is a pure python implementation of SAML Version 2 Standard. PySAML2 before 6.5.0 has an improper verification of cryptographic signature vulnerability. Users of pysaml2 that use the default CryptoBackendXmlSec1 backend and need to verify signed SAML documents are impacted. PySAML2 does not ensure that a signed SAML document is correctly signed. The default CryptoBackendXmlSec1 backend is using the xmlsec1 binary to verify the signature of signed SAML documents, but by default xmlsec1 accepts any type of key found within the given document. xmlsec1 needs to be configured explicitly to only use only _x509 certificates_ for the verification process of the SAML document signature. This is fixed in PySAML2 6.5.0.

Risk And Classification

Problem Types: CWE-347

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Debian Debian Linux 9.0 All All All
Operating System Debian Debian Linux 9.0 All All All
Application Pysaml2 Project Pysaml2 All All All All
Application Pysaml2 Project Pysaml2 All All All All

References

ReferenceSourceLinkTags
pysaml2 · PyPI MISC pypi.org Product, Third Party Advisory
Unspecified xmlsec1 key-type preference · Advisory · IdentityPython/pysaml2 · GitHub CONFIRM github.com Third Party Advisory
[SECURITY] [DLA 2577-1] python-pysaml2 security update MLIST lists.debian.org Mailing List, Third Party Advisory
Release Version 6.5.0 · IdentityPython/pysaml2 · GitHub MISC github.com Third Party Advisory
Merge pull request from GHSA-5p3x-r448-pc62 · IdentityPython/pysaml2@46578df · GitHub MISC github.com Patch, Third Party Advisory
[xmlsec] Xmlsec preferring KeyValue element over explicitly loaded public keys? MISC www.aleksey.com Exploit, Mailing List, Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 179958 Debian Security Update for python-pysaml2 (CVE-2021-21239)
  • 198493 Ubuntu Security Notification for PySAML2 Vulnerability (USN-5066-1)
  • 501681 Alpine Linux Security Update for py3-saml2
  • 501905 Alpine Linux Security Update for py3-saml2
  • 690445 Free Berkeley Software Distribution (FreeBSD) Security Update for pysaml2 (fb67567a-5d95-11eb-a955-08002728f74c)
  • 982936 Python (pip) Security Update for pysaml2 (GHSA-5p3x-r448-pc62)
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