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Category:   Application (Web Browser)  >   Mozilla Firefox Vendors:   Mozilla.org
(Vendor Describes Workaround) Firefox onload() History Access Bug and Install Function Scripting Execution Flaw Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1013925
SecurityTracker URL:  http://securitytracker.com/id/1013925
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  May 9 2005
Impact:   Execution of arbitrary code via network, User access via network
Vendor Confirmed:  Yes  
Version(s): 1.0.3
Description:   Several vulnerabilities were reported in Firefox. A remote user can execute arbitrary code on the target user's system.

A remote user can create specially crafted HTML that, when loaded by the target user, will execute arbitrary code on the target user's system.

A remote user can cause a Firefox chrome page to load a 'javascript:' URL with privileges. The addon install function can be made to display an icon containing a 'javascript:' URL to achieve this.

Because the vulnerable install function can only be loaded via 'update.mozilla.org' or 'addon.mozilla.org', the remote user must exploit a separate vulnerability to trigger the flaw. The onload() event can be exploited via a frame within a javascript page to access ostensibly restricted elements of the window object, such as the history. The history object can be accessed to navigate back to the calling javascript page and execute the page within the context of a window (displaying 'mozilla.org' web page content).

A demonstration exploit is available at:

http://greyhatsecurity.org/vulntests/ffrc.htm

Paul from Greyhats Security reported this vulnerability. Michael Krax assisted in researching this vulnerability.

Impact:   A remote user can execute arbitrary code on the target user's system.
Solution:   As a workaround, the vendor indicates that you can disable Javascript. The vendor is working on a solution.
Vendor URL:  www.mozilla.org/security/announce/mfsa2005-42.html (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   This archive entry is a follow-up to the message listed below.
May 8 2005 Firefox onload() History Access Bug and Install Function Scripting Execution Flaw Lets Remote Users Execute Arbitrary Code



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