Undertow in Red Hat wildfly before version 11.0.0.Beta1 is vulnerable to a resource exhaustion resulting in a denial of service. Undertow keeps a cache of seen HTTP headers in persistent connections. It was found that this cache can easily exploited to fill memory with garbage, up to “max-headers” (default 200) * “max-header-size” (default 1MB) per active TCP connection.
rhn.redhat.com/errata/RHSA-2017-0830.html
rhn.redhat.com/errata/RHSA-2017-0831.html
rhn.redhat.com/errata/RHSA-2017-0832.html
rhn.redhat.com/errata/RHSA-2017-0834.html
rhn.redhat.com/errata/RHSA-2017-0876.html
www.securityfocus.com/bid/97060
access.redhat.com/errata/RHSA-2017:0872
access.redhat.com/errata/RHSA-2017:0873
access.redhat.com/errata/RHSA-2017:3454
access.redhat.com/errata/RHSA-2017:3455
access.redhat.com/errata/RHSA-2017:3456
access.redhat.com/errata/RHSA-2017:3458
bugzilla.redhat.com/show_bug.cgi?id=1404782