AUSCERT External Security Bulletin Redistribution

                   Sec. Vulenrability in ChaiVM EZloader
                               31 July 2002


        AusCERT Security Bulletin Summary

Product:                ChaiVM EZloader
Vendor:                 Hewlett-Packard
Platform:               Appliances and networked printers 
                          (eg HP 4100, HP 45nn, HP 8150 printers)
Impact:                 Increased Privileges
                        Denial of Service
Access Required:        Remote

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 Originally issued: 29 July 2002

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.


PROBLEM: The HP ChaiVM EZloader does not verify JAR signatures
         for new services.

PLATFORM:  Apppliances and networked printers such as, but not
           limited to: HP 4100, HP 45nn, HP 8150 printers.

DAMAGE: Potential unauthorized access, denial of service.

SOLUTION:  Operate behind a firewall.  Set the EWS (Embedded 
           Web Server) password.

MANUAL ACTIONS: Set the EWS password.
 A. Background

    HP ChaiVM is a small Java(tm) virtual machine for use in
    embedded systems.  At one time HP provided an EZloader
    utility for installing applications (Chailets).  EZloader
    does not verify JAR signatures.  This allows any Chailet to 
    be installed.

    HP ChaiVM is designed to be operated from behind a firewall
    where systems within the firewall are trusted.

    Java is a U.S. trademark of Sun Microsystems, Inc.

 B. Fixing the problem

    The recommended countermeasure for customers who wish to
    keep unauthorized users from loading Chailets is to set the
    EWS (embedded webserver) password.

    Operate behind a firewall where systems within the firewall
    are trusted.

 C. 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


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    In the left most frame select "Maintenance and Support".

    Under the "Notifications" section (near the bottom of
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    To -subscribe- to future HP Security Bulletins or other
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    To -review- bulletins already released, select the link
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    To -gain access- to the Security Patch Matrix, select
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    to the current Security Patch Matrix. Updated daily, this 
    matrix categorizes security patches by platform/OS release, 
    and by bulletin topic.  Security Patch Check completely 
    automates the process of reviewing the patch matrix for 
    11.XX systems.

    For information on the Security Patch Check tool, see:

    The security patch matrix is also available via anonymous


    On the "Support Information Digest Main" page:
    click on the "HP Security Bulletin Archive".
 D. To report new security vulnerabilities, send email to


    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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