Security researchers from Duo Labs and the US Computer Emergency Response Team Coordination Center (CERT/CC) will release security advisories today detailing a new SAML vulnerability that allows malicious attackers to authenticate as legitimate users without knowledge of the victim's password.
The flaw affects
SAML (Security Assertion Markup Language), an XML-based markup language often used for exchanging authentication and authorization data between parties.
SAML's most important use if in
single sign-on (SSO) solutions that allow users to log into accounts using one single identity. Unlike other shared authentication schemes —such as OAuth, OpenID, OpenID Connect, and Facebook Connect— SSO stores the user's identity on a central server on which users have accounts.
When users try to login into other enterprise apps, those apps (service providers - SP) make requests to the local SSO server (identity provider - IdP) via SAML.
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