| Package | Affected versions | Patched versions |
|---|---|---|
| edu.internet2.middleware:shibboleth-identityprovider | < 2.4.1 | 2.4.1 |
| org.opensaml:opensaml | < 2.6.2 | 2.6.2 |
| identity provider | < 2.4.1 | 2.4.1 |
| opensaml java | < 2.6.2 | 2.6.2 |
The (1) HttpResource and (2) FileBackedHttpResource implementations in Shibboleth Identity Provider (IdP) before 2.4.1 and OpenSAML Java 2.6.2 do not verify that the server hostname matches a domain name in the subject's Common Name (CN) or subjectAltName field of the X.509 certificate, which allows man-in-the-middle attackers to spoof SSL servers via an arbitrary valid certificate.
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