Six Step IE Remote Compromise Cache Attack

[tested]

OS:WinXp

Microsoft Internet Explorer v6.Sp1; up-to-date on 2003/10/30

[Overview]

A six step cache attack has been found which allows for remote

compromise of systems running Internet Explorer merely by viewing

a webpage.

This attack is possible partly because of the bugs in Internet

Explorer which remain unfixed. The oldest of these bugs is

almost two years old.

A little something old. A little something new.

Some Kung Fu.

[demo]

The below demo runs a harmless, demonstration executable on your system.

http://www.safecenter.net/UMBRELLAWEBV4/execdror5/execdror5-MyPage.htm

Note: This demo has not been found to work on all systems. This seems

to be primarily because of the wide divergence in the placement of temp

folders. A more universal exploit is possible, but too time consuming.

[technical details]

a simple game - It goes a little something like this...

Liu Die Yu's file-protocol proxy bug to reach MYCOMPUTER zone

("file-protocol proxy" *http://safecenter.net/liudieyu/WsOpenFileJPU/WsOpenFileJPU-Content.HTM)

then, in MYCOMPUTER zone:

A. use IFRAME to load MHT file which contains payload EXE, then the MHT

file is stored in IE cache.

B.1. use file:///::{450D8FBA-AD25-11D0-98A8-0800361B1103} to get %USERPROFILE%;

(the Pull's: http://www.derkeiler.com/Mailing-Lists/securityfocus/bugtraq/2002-01/001
3.html )

B.2. use "Redirection and Refresh in Iframe parses local file" to parse

cache index file:

%USERPROFILE%/Local Settings/Temporay Internet Files/CONTENT.IE5/INDEX.DAT

( Mindwarper of mlsecurity's: http://www.mlsecurity.com/ie/ie.htm)

double slash trick is also needed to make the parsed document accessible.

( Liu Die Yu's: http://www.safecenter.net/UMBRELLAWEBV4/DblSlashForCache/DblSlashForCach
e-Content.htm)

C.1. and we get random directory names(like 9OKV91KH), and we get all possible URLs of our payload EXE.

C.2. and we check these URLs with "script src":

(Tom Micklovitch's: http://jscript.dk/Jumper/xploit/scriptsrc.html)

D. when we get a valid local URL pointing to the payload, launch it with

CODEBASE plus "double slash"

( Liu Die Yu's: http://www.safecenter.net/UMBRELLAWEBV4/DblSlashForCache/DblSlashForCach
e-Content.htm)

A little complex. A little simple.

Kung Fu.

[Workaround]

Move your Temporary Internet Files from its' default location:

Tools -> Internet Options -> Temporary Internet Files -> Settings -> Move Folder

[credit]

Liu Die Yu - exploitation;

Dror Shalev developed ASP part of the code in the demo;

Liu Die Yu wrote the first version of this document;

the Pull improved the quality of this document;

All of the researchers named in "technical details";

Microsoft, for not fixing their bugs;

[Greetings]

greetings to:

Drew Copley, dror, guninski and mkill.

[Message]

"My only badge is my conscience. Guns back a badge, but

hellfire backs the conscience." -- Anonymous ;)

-----

all mentioned resources can always be found at UMBRELLA.MX.TC

[people]

LiuDieyuinchina [N0-@-Sp2m] yahoo.com.cn

UMBRELLA.MX.TC ==> How to contact "Liu Die Yu"

[Employment]

I would like to work professionally as a security researcher/bug finder.

See my resume at my site. I am very eager to work, flexible, and

extremely productive. I have a top notch resume, with credentials

from leading bug finders. I am willing to work per contract, relocate,

or telecommute.

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