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iDEFENSE Security Advisory 2004-11-22.t

iDEFENSE Security Advisory 2004-11-22.t
Posted Nov 24, 2004
Authored by Jouko Pynnonen, iDefense Labs | Site klikki.fi

iDEFENSE Security Advisory 11.22.04 - J2SE prior to v1.4.2_06 contains serious remote vulnerabilities which allow applets loaded in browsers to load an unsafe class, and write to any file on a users system. IE, Mozilla, and Firefox can lead to compromise on Linux and Windows systems if a malicious web page is loaded.

tags | advisory, remote, web, vulnerability
systems | linux, windows
advisories | CVE-2004-1029
SHA-256 | b770dc7b3597a8eddba091ed48f8c2ebe227fb5643add55bafe7f720d7437c26

iDEFENSE Security Advisory 2004-11-22.t

Change Mirror Download
   Sun Java Plugin Arbitrary Package Access Vulnerability
iDEFENSE Security Advisory 11.22.04:

I. BACKGROUND

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
[14]http://java.sun.com/products/plugin/.

II. DESCRIPTION

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.

III. ANALYSIS

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.

IV. DETECTION

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.

V. WORKAROUND

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.

VI. VENDOR RESPONSE

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

[15]http://java.sun.com/j2se/1.4.2/download.html

VII. CVE INFORMATION

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 ([16]http://cve.mitre.org), which standardizes names for
security problems.

VIII. DISCLOSURE TIMELINE

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

IX. CREDIT

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

Get paid for vulnerability research
[17]http://www.idefense.com/poi/teams/vcp.jsp

X. LEGAL NOTICES

Copyright © 2004 iDEFENSE, Inc.

Permission is granted for the redistribution of this alert
electronically. It may not be edited in any way without the express
written consent of iDEFENSE. If you wish to reprint the whole or any
part of this alert in any other medium other than electronically,
please
email [18]customerservice@idefense.com for permission.

Disclaimer: The information in the advisory is believed to be accurate
at the time of publishing based on currently available information.
Use
of the information constitutes acceptance for use in an AS IS
condition.
There are no warranties with regard to this information. Neither the
author nor the publisher accepts any liability for any direct,
indirect,
or consequential loss or damage arising from use of, or reliance on,
this information.
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