pysaml2 version 4.4.0 and older accept any password when run with python optimizations enabled. This allows attackers to log in as any user without knowing their password.

Several issues have been found in python-pysaml2, a pure python implementation of SAML Version 2 Standard.

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.

For the detailed security status of python-pysaml2 please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/python-pysaml2

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Pysaml2, a Python implementation of the Security Assertion Markup Language, would accept any password when run with Python optimizations enabled. This allows attackers to log in as any user without knowing their password.

For Debian 8 'Jessie', this issue has been fixed in version 2.0.0-1+deb8u2.

We recommend that you upgrade your python-pysaml2 packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote host is affected by the vulnerability described in GLSA-201801-11 (PySAML2: Security bypass)

    It was found that the PySAML2 relies on an assert statement to check the       user&rsquo;s password. A python optimizations might remove this assertion.
  Impact :

    A remote attacker could bypass security restrictions and access any       application which is using PySAML2 for authentication.
  Workaround :

    Disable python optimizations.

The remote Ubuntu 16.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-3520-1 advisory.

    It was discovered that PySAML2 incorrectly accepted any password when run with python optimizations     enabled. An attacker could use this issue to authenticate as any user without a valid password.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
146893	Debian DLA-2577-1 : python-pysaml2 security update	Nessus	Debian Local Security Checks	high
110819	Debian DLA-1410-1 : python-pysaml2 security update	Nessus	Debian Local Security Checks	high
105755	GLSA-201801-11 : PySAML2: Security bypass	Nessus	Gentoo Local Security Checks	high
105688	Ubuntu 16.04 LTS : PySAML2 vulnerability (USN-3520-1)	Nessus	Ubuntu Local Security Checks	high

Detections

Analytics

CVE-2017-1000433

critical

Tenable Plugins

high

high

high

high