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Debian 9: DLA-2577-1 Critical: Python-pysaml2 Password Authentication Flaw

debian lts
Calendar Grey February 26, 2021
Dist Debian Esm H88
This notification addresses the security enhancement for python-pysaml2 aimed at correcting significant authentication and signature validation vulnerabilities.
Several issues have been found in python-pysaml2, a pure python implementation of SAML Version 2 Standard
Topics%20covered

Topics Covered

security advisory critical Debian password issue signature verification python-pysaml2 saml

Summary

CVE-2017-1000433

pysaml2 accept any password when run with python optimizations
enabled. This allows attackers to log in as any user without
knowing their password.

CVE-2021-21239

pysaml2 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.

For Debian 9 stretch, these problems have been fixed in version
3.0.0-5+deb9u2.

We recommend that you upgrade your python-pysaml2 packages.

Read the Full Advisory


Severity
critical
Lowest
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Critical

Package: python-pysaml2
Version: 3.0.0-5+deb9u2
CVE ID: CVE-2017-1000433 CVE-2021-21239
Debian Bug: 886423 CVE-2021-21239

Topics%20covered

Topics Covered

security advisory critical Debian password issue signature verification python-pysaml2 saml

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