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Category:   Application (Web Browser)  >   Opera Vendors:   Opera Software
Opera Lets Remote Users Execute Arbitrary Files in the Local Zone Using a Specially Crafted IFRAME Tag
SecurityTracker Alert ID:  1008002
SecurityTracker URL:
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Oct 25 2003
Impact:   Disclosure of user information, Execution of arbitrary code via network, Modification of user information, User access via network
Exploit Included:  Yes  

Description:   A vulnerability was reported in the Opera web browser. A remote user can create HTML that, when loaded by the target user, will access and execute files in the local computer zone.

Mindwarper reported that a remote user can create HTML including an iframe that can access or execute local files with the privileges of the local computer zone.

A demonstration exploit is provided:

<iframe name="abc" src="file:///C:/"></iframe>

The vendor was reportedly notified on October 23, 2003.

Impact:   A remote user can execute arbitrary files on the target system in the Local Computer security domain.
Solution:   No solution was available at the time of this entry.
Vendor URL: (Links to External Site)
Cause:   Input validation error, State error
Underlying OS:  BeOS, Linux (Any), Apple (Legacy "classic" Mac), QNX, UNIX (FreeBSD), UNIX (macOS/OS X), UNIX (Solaris - SunOS), Windows (Any)

Message History:   None.

 Source Message Contents

Subject:  Internet Explorer and Opera local zone restriction bypass

Internet Explorer and Opera local zone restriction bypass.

Vendor Information:

Homepage :
Vendor : informed
Mailed advisory: 23/10/03
Vender Response : None yet

Affected Versions:

All version of IE 6
Possibly 5.x too


Microsoft Internet Explorer does not allow local file access by a remote host by default.
By creating an iframe which points on a specially crafted cgi script (using the location header 
to confuse IE), it is possible to cause IE to execute any local file through the iframe with local 
zone restrictions. This then allows remote arbitrary file execution on the victim without having
the victim do a thing except load the page.
Opera seems to not only be affected by this vulnerability, but it also allows direct
local file access through iframes without any cgi scripts. Unlike IE where it is possible
to set activex objects to execute arbitrary files, in Opera it is not. There may be a way,
but I am currently not aware of any.


I have created a proof of concept page, but I did not show or explain how the cgi scripts
nor the flash file work exactly to prevent kiddie abuse.

For IE:

For Opera: <iframe name="abc" src="file:///C:/"></iframe>


Check Microsoft's website frequently until a new patch comes out.


- Mindwarper

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