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Message-ID: <64b43a38-c0c8-9d45-596d-2d89c55aee56@apache.org>
Date: Thu, 25 Jun 2020 22:58:40 +0100
From: Mark Thomas <markt@...che.org>
To: oss-security@...ts.openwall.com
Subject: CVE-2020-11996 Apache Tomcat HTTP/2 Denial of Service
CVE-2020-11996 Apache Tomcat HTTP/2 Denial of Service
Severity: Important
Vendor: The Apache Software Foundation
Versions Affected:
Apache Tomcat 10.0.0-M1 to 10.0.0-M5
Apache Tomcat 9.0.0.M1 to 9.0.35
Apache Tomcat 8.5.0 to 8.5.55
Description:
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.
Mitigation:
- Upgrade to Apache Tomcat 10.0.0-M6 or later
- Upgrade to Apache Tomcat 9.0.36 or later
- Upgrade to Apache Tomcat 8.5.56 or later
Credit:
This issue was reported publicly via the Apache Tomcat Users mailing
list without reference to the potential for DoS. The DoS risks were
identified by the Apache Tomcat Security Team.
References:
[1] http://tomcat.apache.org/security-10.html
[2] http://tomcat.apache.org/security-9.html
[3] http://tomcat.apache.org/security-8.html
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