The ResourceLinkFactory implementation in Apache Tomcat 9.0.0.M1 to 9.0.0.M9, 8.5.0 to 8.5.4, 8.0.0.RC1 to 8.0.36, 7.0.0 to 7.0.70 and 6.0.0 to 6.0.45 did not limit web application access to global JNDI resources to those resources explicitly linked to the web application. Therefore, it was possible for a web application to access any global JNDI resource whether an explicit ResourceLink had been configured or not.
rhn.redhat.com/errata/RHSA-2017-0457.html
www.debian.org/security/2016/dsa-3720
access.redhat.com/errata/RHSA-2017:0455
access.redhat.com/errata/RHSA-2017:0456
access.redhat.com/errata/RHSA-2017:2247
github.com/apache/tomcat
github.com/apache/tomcat/commit/2859ac3eae132383cb6f3f2042e25d7a4a281b0d
github.com/apache/tomcat/commit/b3406e6c318378cbf440f902f9fdbb8b440aef4e
github.com/apache/tomcat/commit/d6b5600afe75e1086dd564344e1d085966e4237d
github.com/apache/tomcat80/commit/824c7dc781056442046db0ae34bcf1497f23f44c
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nvd.nist.gov/vuln/detail/CVE-2016-6797
security.netapp.com/advisory/ntap-20180605-0001
usn.ubuntu.com/4557-1
web.archive.org/web/20170320064509/www.securitytracker.com/id/1037145
web.archive.org/web/20170423095945/www.securityfocus.com/bid/93940
www.oracle.com/security-alerts/cpuoct2021.html