This is somethhing interesting currently being discussed in Bugtraq. The following is html source loaded on a server. fooware.exe is a payload you wish to force a user to download. When they visit a link to a page that has this source their browser would continually open the "The Security of this file canot be verified do you wish to download' Dialog box, about a 1000 times. At a point while it is doing this, for some reason IE will automaticaly download and open every instance of the file. Pretty interesting especially depending on the payload.

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Seems no one was taking this exploit seriously, so the author has extended the description.

QUOTE

marek writes: From: Marek Bialoglowy (mb@systemintegra.com) # UPDATED ADVISORY Systems Affected : Internet Explorer 6.0.2800 (6.x?) Remotely exploitable: Yes Author: Marek Bialoglowy (System Integra - mb@systemintegra.com) Attached files: dmz5-win2k.zip NOTE: Attached file dmz5-win2k.html can crash you IE, be careful with that ! # INTRODUCTION Some people had concern if this vulnerability is really critical. In this post I will try to proof it and also try to answer some questions. I will remaind that the threat from IE 6 vulnerability is that you can FORCE Internet Explorer TO DOWNLOAD AND EXECUTE ANY .exe FILE. My post was not about flooding system with multiple IE file requests, this is just a technique of exploitation. The main point of my post was possibility of bypassing the IE security zones with multiple download requests. > How did you avoid one machine from seeing the file:// request > as a request for a resource from the "Local intranet Zone"? It can be any kind of request, not only the "file://" request but also "ftp://" and "http://". I've just posted example of simple technique exploiting this vulnerability and didn't want to show precise method of using this on the Internet. Actually there is a technique of exploiting it from the Internet. This thing could be easyly used by some worm so I didn't want to give worm writes clue how to do it. > Also, one must assume the two machines are either using the > same userID/password or have a trusted connection already > (otherwise, the file:// request wouldn't be able to see the > attack program.) Workstations on a LAN would not normally > be in this situation unless you are pointing to a file on > a file server they all have access to. In this case, how > did you get the file onto that server? Correct. It is not that harmfull if you think about using this vulnerability only trough "file://" requests. It would require to have some write access to "public" share on the file server os something simmilar. It doesn't sounds like serious threat indeed, but it still could be dangerous if you control some workstation in big corporate network and would like to infect other workstations fast. > Again, I don't mean to minimize the problems should it be true that > the Trust Zone boundary can be broken, but the threat likelihood > is just incredibly miniscule. # ADVANCED EXPLOITATION Ok, I'll describe the technique of exploiting this vulnerability on Win2K via Internet ... no need to access to local network or anything. I've attached example HTML file in this e-mail, check dmz5-win2k.html. The key of Internet exploitation technique is to flood the zones table (well lets call it like that) with other requests before executing the real requests to the trojan.exe. The fastes possible request is certainly the one to the filesystem. So at beggining we execute around 191 of such system file requests: ... together around 191 ... and after comes our trojan ... ... when someone will open such website it is very possible that trojan.exe will get downloaded and executed. I will also notice that this is just example technique and it is possible to master this to the 95% success rate. There are no patches for this vulnerability yet so I'm not going to provide the final version of this specially designed HTML page. I'll just say that number of 191 requests is not valid for all workstations, well I even think that success rate will be around 30%. There is a better technique of flooding security zones, which I won't describe here. Oh I will just mention that this probably won't work on WinXP, but there is another technique for WinXP which works pretty fine. # CONCLUSION Anyways on Friday I've tested that in real-life on my friends office. He said that no1 killed the Internet Explorer or restarted the workstation and all his employees were just glaring on the screen and watching how windows are popping-up. There was even something more surprising, they started sending this URL to each other and to all friends as a "JOKE" ! I got connections from my trojan.exe from 4 different workstations - it's small office. Best Regards, Marek Bialoglowy (mb@systemintegra.com) Information Security Expert PGPkey: http://www.systemintegra.com/pgp/ultor.asc | ID: 0x4B36656E JOB: (CTO) System Integra | JKT, Indonesia | Timezone: JAVT, GMT +7

GovernmentSecurity.org Code Mirror: Can't find the file dmz5-win2k.zip seems the site has pulled it, if you have it PM me so I can archive it here.

sounds a lot like that lamers.exe joke exploit around several years back opening up a flood of windows in IE, but without a trojan added.... might check that code out....looks intersting

That´s prolly how CERT sees it :

http://www.kb.cert.org/vuls/id/251788

The CERT/CC is currently unaware of a complete solution to this problem.

I´d say use Mozilla