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Security advisories — Feb 26, 2019

SAML Authentication Vulnerability

1 minute read
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Researchers have discovered a vulnerability affecting Single Sign-On (SSO) systems that rely on Security Assertion Markup Language (SAML). SAML is a standard for authenticating end users to web applications. If successfully exploited, an attacker would be able to impersonate a legitimate user and obtain privileged information. There are a variety of different methods and libraries that employ the SAML standard for SSO, requiring a security fix for each affected library. This particular attack requires an attacker to have an account already created. The attacker then modifies their account name to impersonate another individual.

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Additional information

The SAML vulnerability takes advantage of libraries incorrectly parsing commented strings and XML canonicalization for signing authentication tokens. The attackers are able to impersonate a legitimate user without altering the cryptographic signature.

Known Affected Systems:

For an in-depth explanation of the SAML vulnerability see the link below:

https://duo.com/blog/duo-finds-saml-vulnerabilities-affecting-multiple-implementations

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