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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.2230
                  CVE-2019-10072 Apache Tomcat HTTP/2 DoS
                               21 June 2019

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

Product:           Apache Tomcat
Publisher:         The Apache Software Foundation
Operating System:  Windows
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-10072 CVE-2019-0199 

Reference:         ESB-2019.1966
                   ESB-2019.1958
                   ESB-2019.0980

Original Bulletin: 
   https://www.mail-archive.com/users@tomcat.apache.org/msg132248.html

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This updated notice corrects the version numbers in the mitigation section.


CVE-2019-10072 Apache Tomcat HTTP/2 DoS

Severity: Important

Vendor: The Apache Software Foundation

Versions Affected:
Apache Tomcat 9.0.0.M1 to 9.0.19
Apache Tomcat 8.5.0 to 8.5.40

Description:
The fix for CVE-2019-0199 was incomplete and did not address connection
window exhaustion on write. By not sending WINDOW_UPDATE messages for
the connection window (stream 0) clients were able
to cause server-side threads to block eventually leading to thread
exhaustion and a DoS.

Mitigation:
Users of affected versions should apply one of the following mitigations:
- - Upgrade to Apache Tomcat 9.0.20 or later
- - Upgrade to Apache Tomcat 8.5.41 or later

Credit:
John Simpson of Trend Micro Security Research working with Trend
Micro's Zero Day Initiative

References:
[1] http://tomcat.apache.org/security-9.html
[2] http://tomcat.apache.org/security-8.html

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===========================================================================
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