The Admin UI in Apache Ranger before 0.5.1 does not properly handle authentication requests that lack a password, which allows remote attackers to bypass authentication by leveraging knowledge of a valid username.
www.securityfocus.com/bid/82871
cwiki.apache.org/confluence/display/RANGER/Vulnerabilities+found+in+Ranger
github.com/advisories/GHSA-j84c-j8qm-g47r
issues.apache.org/jira/browse/RANGER-835
mail-archives.apache.org/mod_mbox/ranger-dev/201602.mbox/%3CD2D9A4C5.114ECA%[email protected]%3E
nvd.nist.gov/vuln/detail/CVE-2016-0733