Arch Linux Security Advisory ASA-202006-16 ========================================== Severity: Medium Date : 2020-06-28 CVE-ID : CVE-2020-11996 Package : tomcat8 Type : denial of service Remote : Yes Link : https://security.archlinux.org/AVG-1197 Summary ======= The package tomcat8 before version 8.5.56-1 is vulnerable to denial of service. Resolution ========== Upgrade to 8.5.56-1. # pacman -Syu "tomcat8>=8.5.56-1" The problem has been fixed upstream in version 8.5.56. Workaround ========== None. Description =========== A denial of service has been found in Apache Tomcat before 9.0.36 and 8.5.56, where a specially crafted sequence of HTTP/2 requests could trigger high CPU usage for several seconds. If a sufficient number of such requests were made on concurrent HTTP/2 connections, the server could become unresponsive. Impact ====== A remote attacker might be able to cause a denial of service via a specially crafted sequence of HTTP/2 requests. References ========== https://www.openwall.com/lists/oss-security/2020/06/25/6 https://tomcat.apache.org/security-9.html#Fixed_in_Apache_Tomcat_9.0.36 https://github.com/apache/tomcat/commit/9a0231683a77e2957cea0fdee88b193b30b0... https://tomcat.apache.org/security-8.html#Fixed_in_Apache_Tomcat_8.5.56 https://github.com/apache/tomcat/commit/c8acd2ab7371e39aeca7c306f3b5380f00af... https://security.archlinux.org/CVE-2020-11996