Improper Certificate Validation and Insufficient Verification of Data Authenticity in Keycloak
Moderate severity
GitHub Reviewed
Published
Jun 27, 2019
to the GitHub Advisory Database
•
Updated Feb 1, 2023
Description
Published by the National Vulnerability Database
Jun 12, 2019
Reviewed
Jun 27, 2019
Published to the GitHub Advisory Database
Jun 27, 2019
Last updated
Feb 1, 2023
A vulnerability was found in keycloak before 6.0.2. The X.509 authenticator supports the verification of client certificates through the CRL, where the CRL list can be obtained from the URL provided in the certificate itself (CDP) or through the separately configured path. The CRL are often available over the network through unsecured protocols ('http' or 'ldap') and hence the caller should verify the signature and possibly the certification path. Keycloak currently doesn't validate signatures on CRL, which can result in a possibility of various attacks like man-in-the-middle.
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