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Published: 5th June 2020

Severity: Medium

CVSS Score: 4.3 (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N)


WSO2 Identity Server : 5.2.0


A potential spoofing vulnerability has been identified in the Passive-STS flow.


This vulnerability could be exploited by sending an invalid "wtrealm" parameter in the Passive STS request. WSO2 Identity server does not validate that parameter, but according to the WS-Federation specification [1] that should be validated.

[1] http://docs.oasis-open.org/wsfed/federation/v1.2/os/ws-federation-1.2-spec-os.html#_Toc223175033


Since Identity Server does not validate the "wtrealm" parameter, a client application can obtain a security token by sending an invalid "wtrealm" value.


If you are using an affected product version, it is highly recommended to migrate to the latest released version to receive security fixes.

You may also apply the relevant fixes based on the changes from the public fix: https://github.com/wso2-extensions/identity-inbound-auth-sts/pull/58

Note: If you are a WSO2 customer with Support Subscription, please use WSO2 Update Manager (WUM) updates in order to apply the fix.

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