SAML Vulnerability VU475445

Document ID : KB000072510
Last Modified Date : 02/03/2018
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Introduction:

Overview

Multiple SAML libraries may incorrectly utilize 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.

Description

CWE-287: Improper Authentication

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

The following CVEs are assigned:

CVE-2017-11427 - OneLogin’s "python-saml"
CVE-2017-11428 - OneLogin’s "ruby-saml"
CVE-2017-11429 - Clever’s "saml2-js"
CVE-2017-11430 - "OmniAuth-SAML"
CVE-2018-0489 - Shibboleth openSAML C++

Question:
Can you please confirm if CA API Gateway is impacted by this SAML Vulnerability? 
Answer:
The CA API gateway does not use the affected libraries, so the Gateway is not affected.