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Rewterz Threat Advisory – Apache Tomcat SETTINGS Denial of Service Vulnerability

Severity

Low

Analysis Summary

CVE-2019-0199
The HTTP/2 implementation 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.

Impact

Denial of Service

Affected Vendors

Apache Foundation

Affected Products

Apache Tomcat 8.x
Apache Tomcat 9.x

Remediation

Update to version 9.0.16 or 8.5.38.