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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
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AusCERT Security Bulletin Summary
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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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HEWLETT-PACKARD COMPANY SECURITY ADVISORY: #0126, 18 October '00
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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
necessary.
AVAILABILITY: Not applicable.
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I.
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
content.
* Static content should be served by the SYSTEM OUTSIDE iPlanet
webserver.
* RewriteRule directives should not rewrite to a reference from
the "/" filesystem.
D. To subscribe to automatically receive future NEW HP Security
Bulletins from the HP IT Resource Center via electronic mail,
do the following:
Use your browser to get to the HP IT Resource Center page
at:
http://itrc.hp.com
Under the Maintenance and Support Menu (Electronic Support Center):
click on the "more..." link. Then -
Use the 'Login' tab at the left side of the screen to login
using your ID and password. Check with your system
administrator to see if you have an existing login or use
the "Register" button at the left to create a login. You will
need to login in order to gain access to many areas of the ITRC.
Remember to save the User ID assigned to you, and your password.
Under the Maintenance and Support Menu, click on the "more..."
link. Under the "Notifications" section (near the bottom of
the page), select "Support Information Digests".
To -subscribe- to future HP Security Bulletins or other
Technical Digests, click the check box (in the left column)
for the appropriate digest and then click the "Update
Subscriptions" button at the bottom of the page.
or
To -review- bulletins already released, select the link
(in the middle column) for the appropriate digest.
To -gain access- to the Security Patch Matrix, select
the link for "The Security Bulletins Archive". Once in
the archive the third link is to our current Security
Patch Matrix. Updated daily, this matrix categorizes security
patches by platform/OS release, and by bulletin topic.
The security patch matrix is also available via anonymous ftp:
ftp.itrc.hp.com
~ftp/export/patches/hp-ux_patch_matrix"
On the "Support Information Digest Main" page:
click on the "HP Security Bulletin Archive".
E. To report new security vulnerabilities, send email to
security-alert@hp.com
Please encrypt any exploit information using the security-alert
PGP key, available from your local key server, or by sending a
message with a -subject- (not body) of 'get key' (no quotes) to
security-alert@hp.com.
Permission is granted for copying and circulating this Advisory to
Hewlett-Packard (HP) customers (or the Internet community) for the
purpose of alerting them to problems, if and only if, the Advisory
is not edited or changed in any way, is attributed to HP, and
provided such reproduction and/or distribution is performed for
non-commercial purposes.
Any other use of this information is prohibited. HP is not liable
for any misuse of this information by any third party.
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