X-Pack Security TLS certificate verification error (ESA-2017-15)
An error was found in the X-Pack Security TLS trust manager for versions 5.0.0 to 5.5.1. If reloading the trust material fails the trust manager will be replaced with an instance that trusts all certificates. This could allow any node using any certificate to join a cluster. The proper behavior in this instance is for the TLS trust manager to deny all certificates.
Affected Versions: 5.0.0 to 5.5.1
Solutions and Mitigations:
X-Pack Security users should upgrade to version 5.5.2. Please note this attack cannot be triggered remotely. The most likely scenario would be local system corruption. Even though crossing a trust boundary cannot be forced by an attacker, we consider a security feature failing in this manner to be a flaw.
CVE ID: CVE-2017-8445