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Gentoo Linux Security Advisory                           GLSA 202012-23
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                                            https://security.gentoo.org/
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  Severity: Low
     Title: Apache Tomcat: Information disclosure
      Date: December 24, 2020
      Bugs: #758338
        ID: 202012-23

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Synopsis
=======
A vulnerability has been discovered in Apache Tomcat that allows for
the disclosure of sensitive information.

Background
=========
Apache Tomcat is a Servlet-3.0/JSP-2.2 Container.

Affected packages
================
     -------------------------------------------------------------------
      Package              /     Vulnerable     /            Unaffected
     -------------------------------------------------------------------
   1  www-servers/tomcat         < 8.5.60:8.5            >= 8.5.60:8.5
                                  < 9.0.40:9               >= 9.0.40:9

Description
==========
It was discovered that Apache Tomcat could re-use an HTTP request
header value from the previous stream received on an HTTP/2 connection
for the request associated with the subsequent stream.

Impact
=====
A remote attacker, by sending well-timed HTTP/2 requests, could
possibly obtain sensitive information.

Workaround
=========
Disable HTTP/2 support.

Resolution
=========
All Apache Tomcat 8.5.x users should upgrade to the latest version:

   # emerge --sync
   # emerge --ask --oneshot --verbose ">=www-servers/tomcat-8.5.60:8.5"

All Apache Tomcat 9.x users should upgrade to the latest version:

   # emerge --sync
   # emerge --ask --oneshot --verbose ">=www-servers/tomcat-9.0.40:9"

References
=========
[ 1 ] CVE-2020-17527
       https://nvd.nist.gov/vuln/detail/CVE-2020-17527

Availability
===========
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  https://security.gentoo.org/glsa/202012-23

Concerns?
========
Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users' machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
https://bugs.gentoo.org.

License
======
Copyright 2020 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

https://creativecommons.org/licenses/by-sa/2.5/