Apache Tomcat: Denial of Service -- Remote/Unauthenticated

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.3123
                       CVE-2021-41079 Apache Tomcat
                             16 September 2021

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Apache Tomcat
Publisher:         Apache Software Foundation
Operating System:  UNIX variants (UNIX, Linux, OSX)
                   Windows
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-41079  

Original Bulletin: 
   https://mail-archives.apache.org/mod_mbox/www-announce/202109.mbox/browser

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CVE-2021-41079 Denial of Service

Severity: Important

Vendor: The Apache Software Foundation

Versions Affected:
Apache Tomcat 10.0.0-M1 to 10.0.2
Apache Tomcat 9.0.0-M1 to 9.0.43
Apache Tomcat 8.5.0 to 8.5.63

Description:
When Tomcat was configured to use NIO+OpenSSL or NIO2+OpenSSL for TLS, a 
specially crafted packet could be used to trigger an infinite loop 
resulting in a denial of service.

Mitigation:
Users of the affected versions should apply one of the following
mitigations:
- - Upgrade to Apache Tomcat 10.0.4 or later
- - Upgrade to Apache Tomcat 9.0.44 or later
- - Upgrade to Apache Tomcat 8.5.64 or later

Note: This issue was fixed in Apache Tomcat 10.0.3 but the release vote 
for the 10.0.3 release candidate did not pass. Therefore, although users 
must download 10.0.4 to obtain a version that includes a fix for this 
issue, version 10.0.3 is not included in the list of affected versions.

Credit:
The Apache Tomcat Security Team would like to thank:
- - Thomas Wozenilek for originally reporting this issue
- - David Frankson of Infinite Campus for providing a test case that
   reproduced the issue.

History:
2021-09-15 Original 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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