Improper Validation Affecting pysaml2 package, versions [,6.5.0)


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.14% (52nd percentile)

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  • Snyk IDSNYK-PYTHON-PYSAML2-1063039
  • published20 Jan 2021
  • disclosed20 Jan 2021
  • creditVictor Schönfelder Garcia, Juraj Somorovsky, Vladislav Mladenov

Introduced: 20 Jan 2021

CVE-2021-21238  (opens in a new tab)
CWE-20  (opens in a new tab)

How to fix?

Upgrade pysaml2 to version 6.5.0 or higher.

Overview

pysaml2 is a Python implementation of SAML Version 2 Standard.

Affected versions of this package are vulnerable to Improper Validation. By default, the SAML document is not validated against an XML schema. This allows invalid XML documents to trick the verification process, by presenting elements with a valid signature inside elements whose content has been malformed. The verification is offloaded to xmlsec1 and xmlsec1 will not validate every signature in the given document, but only the first it finds in the given scope.

References

CVSS Scores

version 3.1