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Category:   Application (Web Browser)  >   Mozilla Firefox Vendors:
Firefox IFRAME Initialization Function Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1015981
SecurityTracker URL:
CVE Reference:   CVE-2006-1993   (Links to External Site)
Updated:  May 2 2006
Original Entry Date:  Apr 24 2006
Impact:   Denial of service via network, Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 1.5 -
Description:   A vulnerability was reported in Firefox. A remote user can cause arbitrary code to be executed on the target user's system.

A remote user can create specially crafted HTML that, when loaded by the target user, will trigger a memory access bug (where a deleted object is incorrectly reused) and execute arbitrary code on the target user's system or cause the target user's browser to crash.

The vulnerability resides in the implementation of based Command Controller functions, where objects are not properly initialized when designMode is enabled.

The bug can be triggered via the iframe.contentWindow.focus() function and potentially other functions.

Firefox 1.0.x is not affected.

The Mozilla Browser Suite 1.7.x is not affected.

Martijn Wargers, Nick Mottsplices, and spiffomatic64 and Securident Technologies independently discovered and reported this vulnerability.

A demonstration exploit is available at:

Impact:   A remote user can create HTML that, when loaded by the target user, will execute arbitrary code on the target user's system with the privileges of the target user.
Solution:   The vendor has issued a fixed version (

The vendor's advisory is available at:

The vendor's bug report is available at:

Vendor URL: (Links to External Site)
Cause:   Access control error, State error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
May 19 2006 (HP Issues Revised Fix for Tru64) Firefox IFRAME Initialization Function Lets Remote Users Execute Arbitrary Code
HP has issued a revised fix for Firefox on HP Tru64 UNIX.

 Source Message Contents

Date:  Mon, 24 Apr 2006 01:26:37 +0000
Subject:  Firefox Remote Code Execution and DoS

 Firefox Web Browser
 Linux, Windows clients' version
 Firefox Remote Code Execution and Denial of Service - Vendor contacted, no patch yet.
 A handling issue exists in how Firefox handles certain Javascript in js320.dll and xpcom_core.dll
regarding iframe.contentWindow.focus().  By manipulating this feature a buffer overflow will occur.  
Proof of Concept:
 splices(splices [dot] org)
 spiffomatic64(spiffomatic64 [dot] com)
 Securident Technologies (securident [dot] com)      


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