Apache Tomcat: CVSS (Max): None

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2022.4853
           CVE-2021-43980 Apache Tomcat - Information Disclosure
                             29 September 2022

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

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

Product:           Apache Tomcat
Publisher:         Apache
Operating System:  UNIX variants (UNIX, Linux, OSX)
                   Windows
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-43980  

Original Bulletin: 
   https://tomcat.apache.org/security-10.html

Comment: CVSS (Max):  None available when published

- --------------------------BEGIN INCLUDED TEXT--------------------

CVE-2021-43980 Apache Tomcat - Information Disclosure

Severity: High

Vendor: The Apache Software Foundation

Versions Affected:
Apache Tomcat 10.1.0-M1 to 10.1.0-M12
Apache Tomcat 10.0.0-M1 to 10.0.18
Apache Tomcat 9.0.0-M1 to 9.0.60
Apache Tomcat 8.5.0 to 8.5.77

Description:
The simplified implementation of blocking reads and writes introduced in 
Tomcat 10 and back-ported to Tomcat 9.0.47 onwards exposed a long 
standing (but extremely hard to trigger) concurrency bug that could 
cause client connections to share an Http11Processor instance resulting 
in responses, or part responses, to be received by the wrong client.

Mitigation:
Users of the affected versions should apply one of the following
mitigations:
- - Upgrade to Apache Tomcat 10.1.0-M14 or later once released
- - Upgrade to Apache Tomcat 10.0.20 or later once released
- - Upgrade to Apache Tomcat 9.0.62 or later once released
- - Upgrade to Apache Tomcat 8.5.78 or later once released
- - Note 10.1.0-M13, 10.0.19 and 9.0.61 were not released

Credit:
Thanks to Adam Thomas, Richard Hernandez and Ryan Schmitt for 
discovering the issue and working with the Tomcat security team to 
identify the root cause and appropriate fix.

History:
2022-09-28 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

- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

        https://www.auscert.org.au/bulletins/

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: https://auscert.org.au/gpg-key/
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=2Xnq
-----END PGP SIGNATURE-----