AUSCERT External Security Bulletin Redistribution
        ESB-2000.301 -- HP Support Information Digests HPSBUX0010-126
               Sec. Vulnerability in Praesidium Web Proxy 1.0
                               20 October 2000


	AusCERT Security Bulletin Summary

Product:                Praesidium Web Proxy
Vendor:                 Hewlett-Packard
Operating System:       VVOS 10.24 and 11.04 running VirtualVault 4.0
Impact:                 Inappropriate Access
Access Required:        Remote

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Document ID:  HPSBUX0010-126
Date Loaded:  20001017
      Title:  Sec. Vulnerability in Praesidium Web Proxy 1.0

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The information in the following Security Advisory 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:  Apache 1.3.12 included in the HP Praesidium Web Proxy,
          contains a vulnerability.

PLATFORM: VVOS release 10.24 and 11.04 running VirtualVault 4.0,
          with HP Praesidium Proxy V1.0 only.

DAMAGE:   Users can gain unauthorized file access if the proxy
          were to be used to serve static web pages that exist on
          the VirtualVault.

SOLUTION: Implementors of the HP Praesidium Proxy should be aware
          of the vulnerability and should examine their proxy
          configuration to determine if this vulnerability affects
          them.  If so, they should reconfigure their web server as

AVAILABILITY: Not applicable.

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  A. Background
     If the result of a RewriteRule is a filename that contains regular
     expression references, then an attacker may be able to access any
     file readable by the iwww user on the web server.  Since the HP
     Praesidium Web proxy runs as user iwww in group www (and not root,
     as on a standard HP-UX system), the attacker would only have
     access to files readable by the iwww user, www group at SYSTEM
     INSIDE.  The iwww user has no privileges or login access on
     the VirtualVault.

     Here are some example RewriteRule directives.  The first two
     directives are vulnerable, the last one is not.

       RewriteRule    /test/(.*)        /usr/local/data/test-stuff/$1
       RewriteRule    /more-icons/(.*)  /icons/$1
       RewriteRule    /go/(.*)           http://www.otherserver.com/$1

  B. Fixing the problem
     Implementors of the HP Praesidium Proxy should be aware of the
     vulnerability and immediately examine their proxy configuration
     to determine if this vulnerability affects them.  Reconfiguration
     of the web server should be done as necessary.

  C. Recommended solution
     * The HP Praesidium Proxy should NOT be used to serve static html
     * Static content should be served by the SYSTEM OUTSIDE iPlanet
     * RewriteRule directives should not rewrite to a reference from
       the "/" filesystem.

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