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Category:   Application (Web Browser)  >   Netscape Communicator Vendors:   Netscape
(Fixed Version Available for Red Hat Linux) Re: Netscape 4.76 Browser May Execute Arbitrary Javascript Code that Could Disclose Recently Visited Web URLs
SecurityTracker Alert ID:  1001297
SecurityTracker URL:
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Apr 11 2001
Impact:   Disclosure of user information, Execution of arbitrary code via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   Netscape Navigator/Communicator 4.76 contains a vulnerability that could permit malicious Javascript code to be executed on the user's browser. The code can access certain items on the user's host (such as the History) and disclose them.

Because the Netscape browser does not escape the GIF file comment in the image information page, javascript code can be inserted within the GIF file comment. This code will be executed in the "about:" realm, which allows the code to access various "about:" information, including the "about:global" command, which stores a list of recently visited URLs.

The user must visit a malicious web page or read a malicious e-mail to trigger an exploit of this vulnerability.

See the source message for more information, including some example demonstration exploit code.

Impact:   A malicious web page or e-mail message could cause Javascript code to be executed on the user's browser. This code could disclose certain information, including a list of recently visited URLs.
Solution:   Red Hat advised that new netscape packages available. See the source message for details or reference Red Hat advisory RHSA-2001:046-03. Affected architectures are: Red Hat Linux 6.2 - alpha, i386, and Red Hat Linux 7.0 - alpha, i386
Vendor URL: (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Red Hat Linux)

Message History:   This archive entry is a follow-up to the message listed below.
Apr 10 2001 Netscape 4.76 Browser May Execute Arbitrary Javascript Code that Could Disclose Recently Visited Web URLs

 Source Message Contents

Date:  Tue, 10 Apr 2001 22:32:00 -0400
Subject:  [RHSA-2001:046-03] New netscape packages available

                   Red Hat, Inc. Red Hat Security Advisory

Synopsis:          New netscape packages available
Advisory ID:       RHSA-2001:046-03
Issue date:        2001-04-09
Updated on:        2001-04-10
Product:           Red Hat Linux
Keywords:          netscape gif comment
Cross references:  

1. Topic:

New netscape packages are availabe to fix a problem with the handling of
JavaScript in certain situations. By exploiting this flaw, a remote site
could gain access to the browser history, and possibly other data.

It is recommended that all users upgrade to the fixed packages.

2. Relevant releases/architectures:

Red Hat Linux 6.2 - alpha, i386

Red Hat Linux 7.0 - alpha, i386

3. Problem description:

Netscape does not escape GIF file comments in the image information page;
this allows JavaScript commands embedded therein to be executed. These
commands could access data such as the browser history.

Credit goes to Florian Wesch <> for discovering the
vulnerability, and to Netscape for providing fixed packages.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

To update all RPMs for your particular architecture, run:

rpm -Fvh [filenames]

where [filenames] is a list of the RPMs you wish to upgrade.  Only those
RPMs which are currently installed will be updated.  Those RPMs which are
not installed but included in the list will not be updated.  Note that you
can also use wildcards (*.rpm) if your current directly *only* contains the
desired RPMs.

Please note that this update is also available via Red Hat Network.  Many
people find this an easier way to apply updates.  To use Red Hat Network,
launch the Red Hat Update Agent with the following command:


This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.

5. Bug IDs fixed ( for more info):

6. RPMs required:

Red Hat Linux 6.2:




Red Hat Linux 7.0:




7. Verification:

MD5 sum                           Package Name
1fde261c2376c8d210f6d72d23ad4de6 6.2/en/os/SRPMS/netscape-4.77-0.6.2.src.rpm
71b4f8c9d9cb39df21a6d99e0c062b80 6.2/en/os/SRPMS/netscape-alpha-4.77-0.6.2.src.rpm
0190f8439a1507165230f328dfe46ba2 6.2/en/os/alpha/netscape-common-4.77-0.6.2.alpha.rpm
a571ee08b6b44aa4cbc3b98b6bef646c 6.2/en/os/alpha/netscape-communicator-4.77-0.6.2.alpha.rpm
304df2ab2e6f052a0e6bb432dd6f0afe 6.2/en/os/alpha/netscape-navigator-4.77-0.6.2.alpha.rpm
a2a5adb4500d667265a34fb99b59c37c 6.2/en/os/i386/netscape-common-4.77-0.6.2.i386.rpm
9f439fa9e54ea82b37c1a3aa7c49d032 6.2/en/os/i386/netscape-communicator-4.77-0.6.2.i386.rpm
b0970903ea25f2fe73c8d66afb9218cb 6.2/en/os/i386/netscape-navigator-4.77-0.6.2.i386.rpm
400709093733a7ccf90da78d179daeb1 7.0/en/os/SRPMS/netscape-4.77-1.src.rpm
29b80daa27fdad309a68f8101830e863 7.0/en/os/SRPMS/netscape-alpha-4.77-1.src.rpm
a0fbb89d2dfb86c432f1d190e38981f3 7.0/en/os/alpha/netscape-common-4.77-1.alpha.rpm
05859fefa5d8cd3b02d2c768b614490b 7.0/en/os/alpha/netscape-communicator-4.77-1.alpha.rpm
d0681b896b1fee8d5f1783274f4b1f64 7.0/en/os/alpha/netscape-navigator-4.77-1.alpha.rpm
4bb1bcc4c439531019bcab78cd953f59 7.0/en/os/i386/netscape-common-4.77-1.i386.rpm
7d6948941a20599b302bc0bc4f1c0999 7.0/en/os/i386/netscape-communicator-4.77-1.i386.rpm
7d570955357ad6b8fbb9d9fd4913d5cf 7.0/en/os/i386/netscape-navigator-4.77-1.i386.rpm

These packages are GPG signed by Red Hat, Inc. for security.  Our key
is available at:

You can verify each package with the following command:
    rpm --checksig  <filename>

If you only wish to verify that each package has not been corrupted or
tampered with, examine only the md5sum with the following command:
    rpm --checksig --nogpg <filename>

8. References:

Copyright(c) 2000, 2001 Red Hat, Inc.


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