The HTTP/2 implementation in Apache Tomcat 9.0.0.M1 to 9.0.14 and 8.5.0 to 8.5.37 accepted streams with excessive numbers of SETTINGS frames and also permitted clients to keep streams open without reading/writing request/response data. By keeping streams open for requests that utilised the Servlet API’s blocking I/O, clients were able to cause server-side threads to block eventually leading to thread exhaustion and a DoS.
[
{
"product": "Apache Tomcat",
"vendor": "n/a",
"versions": [
{
"status": "affected",
"version": "Apache Tomcat 9.0.0.M1 to 9.0.14, 8.5.0 to 8.5.37"
}
]
}
]
lists.opensuse.org/opensuse-security-announce/2019-06/msg00090.html
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www.securityfocus.com/bid/107674
access.redhat.com/errata/RHSA-2019:3929
access.redhat.com/errata/RHSA-2019:3931
lists.apache.org/thread.html/158ab719cf60448ddbb074798f09152fdb572fc8f781e70a56118d1a%40%3Cdev.tomcat.apache.org%3E
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seclists.org/bugtraq/2019/Dec/43
security.netapp.com/advisory/ntap-20190419-0001/
support.f5.com/csp/article/K17321505
www.debian.org/security/2019/dsa-4596
www.oracle.com/security-alerts/cpuapr2020.html
www.oracle.com/security-alerts/cpujan2020.html
www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html