RE: iDEFENSE Security Advisory 11.22.04: Sun Java Plugin Arbitrar y Package Access Vulnerability

From: Sherlock, Nathan (
Date: 11/23/04

  • Next message: James Youngman: "Re: Changes to the filesystem while find is running - comments?"
    To: customer service mailbox <>,,
    Date: Tue, 23 Nov 2004 09:12:01 -0600

    The workaround mentions the Microsoft Java Virtual Machine (MSJVM).

    Note that MSJVM will reach its end of life on December 31, 2007 -

    Microsoft is encouraging developers to transition away from MSJVM.


    -----Original Message-----
    From: customer service mailbox []
    Sent: Monday, November 22, 2004 1:18 PM
    Subject: iDEFENSE Security Advisory 11.22.04: Sun Java Plugin Arbitrary
    Package Access Vulnerability

    Sun Java Plugin Arbitrary Package Access Vulnerability

    iDEFENSE Security Advisory 11.22.04
    November 22, 2004


    Java Plug-in technology, included as part of the Java 2 Runtime Environment,
    Standard Edition (JRE), establishes a connection between popular browsers
    and the Java platform. This connection enables applets on Web sites to be
    run within a browser on the desktop. More information about Java Plug-in
    technology is available from


    Remote exploitation of a design vulnerability in Sun Microsystems Inc.'s
    Java Plug-in technology allows attackers to bypass the Java sandbox and all
    security restrictions imposed within Java Applets.

    A number of private Java packages exist within the Java Virtual Machine
    (VM) and are used internally by the VM. Security restrictions prevent
    Applets from accessing these packages. Any attempt to access these packages,
    results in a thrown exception of 'AccessControlException', unless the Applet
    is signed and the user has chosen to trust the issuer.

    The problem specifically exists within the access controls of the Java to
    Javascript data exchange in web browsers using Sun's Java Plug-in
    technology. The vulnerability allows Javascript code to load an unsafe class
    which should not normally be possible from a Java Applet.


    Successful exploitation allows remote attackers to execute hostile Applets
    that can access, download, upload or execute arbitrary files as well as
    access the network. A target user must be running a browser on top of a
    vulnerable Java Virtual Machine to be affected. It is possible for an
    attacker to create a cross-platform, cross-browser exploit for this
    vulnerability. Once compromised, an attacker can execute arbitrary code
    under the privileges of the user who instantiated the vulnerable browser.


    iDEFENSE has confirmed the existence of this vulnerability in Java 2
    Platform, Standard Edition (J2SE) 1.4.2_01 and 1.4.2_04 from Sun
    Microsystems. It is suspected that earlier versions are vulnerable as well.
    Various browsers such as Internet Explorer, Mozilla and Firefox on both
    Windows and Unix platforms can be exploited if they are running a vulnerable
    Java Virtual Machine.


    Disabling Java or JavaScript will prevent exploitation as the vulnerability
    relies on the data transfer between the two components.
    Other Java Virtual Machines, such as the Microsoft VM, are available and can
    be used as an alternative.


    This issue has been fixed in J2SE v 1.4.2_06 available at:


    The Common Vulnerabilities and Exposures (CVE) project has assigned the name
    CAN-2004-1029 to this issue. This is a candidate for inclusion in the CVE
    list (, which standardizes names for security problems.


    06/29/2004 Initial vendor notification
    06/30/2004 Initial vendor response
    08/16/2004 iDEFENSE clients notified
    11/22/2004 Public disclosure


    Jouko Pynnonen (jouko[at] is credited with this discovery.

    Get paid for vulnerability research


    Copyright (c) 2004 iDEFENSE, Inc.

    Permission is granted for the redistribution of this alert electronically.
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    Disclaimer: The information in the advisory is believed to be accurate at
    the time of publishing based on currently available information. Use of the
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    There are no warranties with regard to this information. Neither the author
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