SSRT3615 Apache web server HTTP TRACE enabled by default

From: Security Alert (secure_at_cup.hp.com)
Date: 09/08/03


Date: 8 Sep 2003 05:49:41 -0600


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 Source: HEWLETT-PACKARD COMPANY
 SECURITY BULLETIN: HPSBUX0309-279
 Originally issued: 07 September 2003
 SSRT3615 Apache web server HTTP TRACE enabled by default
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NOTICE: There are no restrictions for distribution of this
Bulletin provided that it remains complete and intact.

The information in the following Security Bulletin should be
acted upon as soon as possible. Hewlett-Packard Company will
not be liable for any consequences to any customer resulting
from customer's failure to fully implement instructions in this
Security Advisory as soon as possible.

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PROBLEM: The HTTP TRACE method returns the contents of client
         HTTP requests in the entity-body of the TRACE response.
         This behavior could be exploited by attackers to access
         sensitive information.

IMPACT: Potential for access to sensitive information.

PLATFORM: Any HP system running the Apache Web Server.

SOLUTION: If site requirements allow, disable HTTP TRACE.

MANUAL ACTIONS: Yes - NonUpdate
                If site requirements allow, disable HTTP TRACE.

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 A. Background
    Certain client applications have cross domain vulnerabilities.
    These vulnerabilities can be exploited to use the HTTP TRACE
    method present in many web servers to return sensitive
    information such as cookies or authentication data. This
    exploit method can be blocked by disabling HTTP TRACE.

    It should be noted that disabling HTTP TRACE does not
    eliminate the client side cross domain vulnerabilities. It
    blocks one method of exploiting them. Also, the HTTP TRACE
    method is not itself defective.

    More details can be found here:

       <http://www.kb.cert.org/vuls/id/867593>

    AFFECTED VERSIONS

       Advisory Only

    END AFFECTED VERSIONS

 B. Recommended solution

    If HTTP TRACE is not required by a site it should be disabled.

    TRACE requests can be disabled with the following mod_rewrite
    syntax in the Apache server's httpd.conf file:

             RewriteEngine On
             RewriteCond %{REQUEST_METHOD} ^TRACE
             RewriteRule .* - [F]

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(c)Copyright 2003 Hewlett-Packard Company
Hewlett-Packard Company shall not be liable for technical or
editorial errors or omissions contained herein. The information
in this document is subject to change without notice.
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herein are trademarks and/or service marks of Hewlett-Packard
Company. Other product and company names mentioned herein may be
trademarks and/or service marks of their respective owners.

 ________________________________________________________________

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--
Yours truly,
HP S/W Security Team
WTEC Cupertino, California
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