Authentication Bypass Affecting python-saml package, versions [,2.4.0)


Severity

Recommended
0.0
medium
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

Exploit Maturity
Proof of concept
EPSS
1.79% (88th percentile)

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  • Snyk IDSNYK-PYTHON-PYTHONSAML-40774
  • published28 Feb 2018
  • disclosed27 Feb 2018
  • creditKelby Ludwig

Introduced: 27 Feb 2018

CVE-2017-11427  (opens in a new tab)
CWE-287  (opens in a new tab)

How to fix?

Upgrade python-saml to versions 2.4.0 or higher.

Overview

python-saml adds SAML support to Python software.

Affected versions of this package are vulnerable to Authentication Bypass. It incorrectly utilizes the results of XML DOM traversal and canonicalization APIs in such a way that an attacker may be able to manipulate the SAML data without invalidating the cryptographic signature, allowing the attack to potentially bypass authentication to SAML service providers.

Details

Security Assertion Markup Language (SAML) is an XML-based markup language for security assertions regarding authentication and permissions, most commonly used for single sign-on (SSO) services.

Some XML DOM traversal and canonicalization APIs may be inconsistent in handling of comments within XML nodes. Incorrect use of these APIs by some SAML libraries results in incorrect parsing of the inner text of XML nodes such that any inner text after the comment is lost prior to cryptographically signing the SAML message. Text after the comment therefore has no impact on the signature on the SAML message.

A remote attacker can modify SAML content for a SAML service provider without invalidating the cryptographic signature, which may allow attackers to bypass primary authentication for the affected SAML service provider.

CVSS Scores

version 3.1