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Category:   Application (Web Server/CGI)  >   Apache Tomcat Vendors:   Apache Software Foundation
(Red Hat Issues Fix) Apache Tomcat Lets Remote Users Conduct HTTP Response Splitting Attacks
SecurityTracker Alert ID:  1038032
SecurityTracker URL:  http://securitytracker.com/id/1038032
CVE Reference:   CVE-2016-6816   (Links to External Site)
Date:  Mar 15 2017
Impact:   Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 6.0.0 to 6.0.47, 7.0.0 to 7.0.72, 8.0.0.RC1 to 8.0.38, 8.5.0 to 8.5.6, 9.0.0.M1 to 9.0.0.M11
Description:   A vulnerability was reported in Apache Tomcat. A remote user can conduct HTTP response splitting attacks.

A remote user can submit a specially crafted URL to cause the target server to return a split response. A remote user can exploit this to spoof content on the target server, attempt to poison any intermediate web caches, or conduct cross-site scripting attacks.

Regis Leroy from Makina Corpus reported this vulnerability.

Impact:   A remote user can create a URL that, when loaded by the target user, will cause arbitrary content to be displayed.

A remote user may be able to poison any intermediate web caches with arbitrary content.

Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2017-0527.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2017-0527.html (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  6

Message History:   This archive entry is a follow-up to the message listed below.
Nov 23 2016 Apache Tomcat Lets Remote Users Conduct HTTP Response Splitting Attacks



 Source Message Contents

Date:  Wed, 15 Mar 2017 13:56:22 +0000
Subject:  [RHSA-2017:0527-01] Moderate: tomcat6 security update

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: tomcat6 security update
Advisory ID:       RHSA-2017:0527-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2017-0527.html
Issue date:        2017-03-15
CVE Names:         CVE-2016-6816 CVE-2016-8745 
=====================================================================

1. Summary:

An update for tomcat6 is now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having a security impact
of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available for each vulnerability from
the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Desktop Optional (v. 6) - noarch
Red Hat Enterprise Linux HPC Node Optional (v. 6) - noarch
Red Hat Enterprise Linux Server (v. 6) - noarch
Red Hat Enterprise Linux Server Optional (v. 6) - noarch
Red Hat Enterprise Linux Workstation (v. 6) - noarch
Red Hat Enterprise Linux Workstation Optional (v. 6) - noarch

3. Description:

Apache Tomcat is a servlet container for the Java Servlet and JavaServer
Pages (JSP) technologies.

Security Fix(es):

* It was discovered that the code that parsed the HTTP request line
permitted invalid characters. This could be exploited, in conjunction with
a proxy that also permitted the invalid characters but with a different
interpretation, to inject data into the HTTP response. By manipulating the
HTTP response the attacker could poison a web-cache, perform an XSS attack,
or obtain sensitive information from requests other then their own.
(CVE-2016-6816)

Note: This fix causes Tomcat to respond with an HTTP 400 Bad Request error
when request contains characters that are not permitted by the HTTP
specification to appear not encoded, even though they were previously
accepted. The newly introduced system property
tomcat.util.http.parser.HttpParser.requestTargetAllow can be used to
configure Tomcat to accept curly braces ({ and }) and the pipe symbol (|)
in not encoded form, as these are often used in URLs without being properly
encoded. 

* A bug was discovered in the error handling of the send file code for the
NIO HTTP connector. This led to the current Processor object being added to
the Processor cache multiple times allowing information leakage between
requests including, and not limited to, session ID and the response body.
(CVE-2016-8745)

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1397484 - CVE-2016-6816 tomcat: HTTP Request smuggling vulnerability due to permitting invalid character in HTTP requests
1403824 - CVE-2016-8745 tomcat: information disclosure due to incorrect Processor sharing

6. Package List:

Red Hat Enterprise Linux Desktop Optional (v. 6):

Source:
tomcat6-6.0.24-105.el6_8.src.rpm

noarch:
tomcat6-6.0.24-105.el6_8.noarch.rpm
tomcat6-admin-webapps-6.0.24-105.el6_8.noarch.rpm
tomcat6-docs-webapp-6.0.24-105.el6_8.noarch.rpm
tomcat6-el-2.1-api-6.0.24-105.el6_8.noarch.rpm
tomcat6-javadoc-6.0.24-105.el6_8.noarch.rpm
tomcat6-jsp-2.1-api-6.0.24-105.el6_8.noarch.rpm
tomcat6-lib-6.0.24-105.el6_8.noarch.rpm
tomcat6-servlet-2.5-api-6.0.24-105.el6_8.noarch.rpm
tomcat6-webapps-6.0.24-105.el6_8.noarch.rpm

Red Hat Enterprise Linux HPC Node Optional (v. 6):

Source:
tomcat6-6.0.24-105.el6_8.src.rpm

noarch:
tomcat6-6.0.24-105.el6_8.noarch.rpm
tomcat6-admin-webapps-6.0.24-105.el6_8.noarch.rpm
tomcat6-docs-webapp-6.0.24-105.el6_8.noarch.rpm
tomcat6-el-2.1-api-6.0.24-105.el6_8.noarch.rpm
tomcat6-javadoc-6.0.24-105.el6_8.noarch.rpm
tomcat6-jsp-2.1-api-6.0.24-105.el6_8.noarch.rpm
tomcat6-lib-6.0.24-105.el6_8.noarch.rpm
tomcat6-servlet-2.5-api-6.0.24-105.el6_8.noarch.rpm
tomcat6-webapps-6.0.24-105.el6_8.noarch.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
tomcat6-6.0.24-105.el6_8.src.rpm

noarch:
tomcat6-6.0.24-105.el6_8.noarch.rpm
tomcat6-el-2.1-api-6.0.24-105.el6_8.noarch.rpm
tomcat6-jsp-2.1-api-6.0.24-105.el6_8.noarch.rpm
tomcat6-lib-6.0.24-105.el6_8.noarch.rpm
tomcat6-servlet-2.5-api-6.0.24-105.el6_8.noarch.rpm

Red Hat Enterprise Linux Server Optional (v. 6):

Source:
tomcat6-6.0.24-105.el6_8.src.rpm

noarch:
tomcat6-admin-webapps-6.0.24-105.el6_8.noarch.rpm
tomcat6-docs-webapp-6.0.24-105.el6_8.noarch.rpm
tomcat6-javadoc-6.0.24-105.el6_8.noarch.rpm
tomcat6-webapps-6.0.24-105.el6_8.noarch.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
tomcat6-6.0.24-105.el6_8.src.rpm

noarch:
tomcat6-6.0.24-105.el6_8.noarch.rpm
tomcat6-el-2.1-api-6.0.24-105.el6_8.noarch.rpm
tomcat6-jsp-2.1-api-6.0.24-105.el6_8.noarch.rpm
tomcat6-lib-6.0.24-105.el6_8.noarch.rpm
tomcat6-servlet-2.5-api-6.0.24-105.el6_8.noarch.rpm

Red Hat Enterprise Linux Workstation Optional (v. 6):

Source:
tomcat6-6.0.24-105.el6_8.src.rpm

noarch:
tomcat6-admin-webapps-6.0.24-105.el6_8.noarch.rpm
tomcat6-docs-webapp-6.0.24-105.el6_8.noarch.rpm
tomcat6-javadoc-6.0.24-105.el6_8.noarch.rpm
tomcat6-webapps-6.0.24-105.el6_8.noarch.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2016-6816
https://access.redhat.com/security/cve/CVE-2016-8745
https://access.redhat.com/security/updates/classification/#moderate

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2017 Red Hat, Inc.
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