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APSC-DV-000210 The application must ensure each unique asserting party provides unique assertion ID references for each SAML assertion.

DISA STIG library V6R5
All changes in this version
first version loaded CAT II

Maps to AC-17(2) via CCI-000068

Title

The application must ensure each unique asserting party provides unique assertion ID references for each SAML assertion.

Control

Ask the application representative for the design document. Review the design document for web services using SAML assertions. If the application does not utilize SAML assertions, this check is not applicable. Review the design document and verify SAML assertion identifiers are not reused by a single asserting party. If the design document does not exist, or does not indicate SAML assertion identifiers which are unique for each asserting party, this is a finding.

Discussion

SAML is a standard for exchanging authentication and authorization data between security domains. SAML uses security tokens containing assertions to pass information about a principal (usually an end user) between a SAML authority, (identity provider), and a SAML consumer, (service provider). SAML assertions are usually made about a subject, (user) represented by the element. SAML assertion identifiers should be unique across a system implementation. Duplicate SAML assertion identifiers could lead to unauthorized access to a web service.

Related controls

CCI-000068

Fix

Design and configure each SAML assertion authority to use unique assertion identifiers.