The URL pattern of “” (the empty string) which exactly maps to the context root was not correctly handled in Apache Tomcat 9.0.0.M1 to 9.0.4, 8.5.0 to 8.5.27, 8.0.0.RC1 to 8.0.49 and 7.0.0 to 7.0.84 when used as part of a security constraint definition. This caused the constraint to be ignored. It was, therefore, possible for unauthorised users to gain access to web application resources that should have been protected. Only security constraints with a URL pattern of the empty string were affected.
www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
www.securityfocus.com/bid/103170
www.securitytracker.com/id/1040427
access.redhat.com/errata/RHSA-2018:0465
access.redhat.com/errata/RHSA-2018:0466
access.redhat.com/errata/RHSA-2018:1320
access.redhat.com/errata/RHSA-2018:1447
access.redhat.com/errata/RHSA-2018:1448
access.redhat.com/errata/RHSA-2018:1449
access.redhat.com/errata/RHSA-2018:1450
access.redhat.com/errata/RHSA-2018:1451
access.redhat.com/errata/RHSA-2018:2939
access.redhat.com/errata/RHSA-2019:2205
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lists.apache.org/thread.html/r9136ff5b13e4f1941360b5a309efee2c114a14855578c3a2cbe5d19c%40%3Cdev.tomcat.apache.org%3E
lists.apache.org/thread.html/raba0fabaf4d56d4325ab2aca8814f0b30a237ab83d8106b115ee279a%40%3Cdev.tomcat.apache.org%3E
lists.debian.org/debian-lts-announce/2018/03/msg00004.html
lists.debian.org/debian-lts-announce/2018/06/msg00008.html
lists.debian.org/debian-lts-announce/2018/07/msg00044.html
security.netapp.com/advisory/ntap-20180706-0001/
usn.ubuntu.com/3665-1/
www.debian.org/security/2018/dsa-4281
www.oracle.com/security-alerts/cpuapr2020.html
www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html