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AUSCERT External Security Bulletin Redistribution
ESB-2021.3418
Denial of Service Vulnerability in Apache Web Server
15 October 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Apache Tomcat
Publisher: Apache
Operating System: UNIX variants (UNIX, Linux, OSX)
Windows
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-42340
Original Bulletin:
https://lists.apache.org/thread.html/r83a35be60f06aca2065f188ee542b9099695d57ced2e70e0885f905c%40%3Cannounce.tomcat.apache.org%3E
Comment: This advisory references vulnerabilities in products which run on
platforms other than UNIX variants (UNIX, Linux, OSX). It is recommended that administrators
running Apache check for an updated version of the software for
their operating system.
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CVE-2021-42340 Denial of Service
Severity: Important
Vendor: The Apache Software Foundation
Versions Affected:
Apache Tomcat 10.1.0-M1 to 10.1.0-M5
Apache Tomcat 10.0.0-M10 to 10.0.11
Apache Tomcat 9.0.40 to 9.0.53
Apache Tomcat 8.5.60 to 8.5.71
Description:
The fix for bug 63362 introduced a memory leak. The object introduced to
collect metrics for HTTP upgrade connections was not released for
WebSocket connections once the WebSocket connection was closed. This
created a memory leak that, over time, could lead to a denial of service
via an OutOfMemoryError.
Mitigation:
Users of the affected versions should apply one of the following
mitigations:
- - Upgrade to Apache Tomcat 10.1.0-M6 or later
- - Upgrade to Apache Tomcat 10.0.12 or later
- - Upgrade to Apache Tomcat 9.0.54 or later
- - Upgrade to Apache Tomcat 8.5.72 or later
History:
2021-10-14 Original advisory
2021-10-14 Correct CVE reference in body of advisory
References:
[1] https://tomcat.apache.org/security-10.html
[2] https://tomcat.apache.org/security-9.html
[3] https://tomcat.apache.org/security-8.html
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