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                             CERT-Renater

                 Note d'Information No. 2021/VULN536
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DATE                : 15/10/2021

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running Apache Tomcat versions prior to
                           10.1.0-M6, 10.0.12, 9.0.54, 8.5.72.

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https://lists.apache.org/thread.html/r83a35be60f06aca2065f188ee542b9099695d57ced2e70e0885f905c%40%3Cannounce.tomcat.apache.org%3E
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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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