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

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-69283	APSC-DV-000210	SV-83905r2_rule		Medium

Description
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 <Subject> element. SAML assertion identifiers should be unique across a system implementation. Duplicate SAML assertion identifiers could lead to unauthorized access to a web service.

Description

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 <Subject> element. SAML assertion identifiers should be unique across a system implementation. Duplicate SAML assertion identifiers could lead to unauthorized access to a web service.

STIG	Date
Application Security and Development Security Technical Implementation Guide	2019-09-30

Details

Check Text ( C-69691r1_chk )
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.

Check Text ( C-69691r1_chk )

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.

Fix Text (F-75453r1_fix)
Design and configure each SAML assertion authority to use unique assertion identifiers.