0 10 20 30 40 50 60 70 80 90 100 |----|----|----|----|----|----|----|----|----|----| ................................................... .---------------. / NtWaK0 Bugs \ +-----------------------------------------------------------------------. : Affected : All systems with Internet Explorer IE 6.x /OPERA : Type : getting Files into your disk even if download is : Type : DISABLED. Can be used also by BAD webs to fill your DISK : Date : 15-03-2002 : Author : NtWaK0 @ www.SafeHack.com : +-----------------------------------------------------------------------. +---------------------. Device Identification \ +-----------------------`-----------------------------------------------. : +-----------. : Disclaimer \ : +-------------`---------------------------------------------------------. The information in this advisory is believed to be true based on : experiments though it may be false. The opinions expressed in this : advisory and program are my own and NOT of any company. : In Fact I do not work for no one at the present time. : : This material is presented for informational and entertainment purposes : only, and to satisfy the curious. Any activities described in this file : which involve vandalism, theft, or any other illegal activities are : recounted from third-party conversations. I do not condone or encourage : vandalism or theft. I do not accept any liability for anything anyone : does with this information. : Remember: Use a computer in ways that ensure respect for your fellows. : : +-------------. : Brief History \ : +---------------`-------------------------------------------------------. This is not BIG issue but still something that need to be addressed. : : Internet Explorer 6.x allow you to save a file even if your security : Setting is HIGH (download file is disabled). Read below for more details: : Opera will auto-download files with .cab extension as soon as you open : the html page. : : Internet explorer and Opera are affected by this. Mozilla act PRETTY OK : : +---------------------------+ : >>> Test OS Applications <<< : +---------------------------+ : Tested on Windows 2k and XP : Tested on IE 6.x and opera : : +-----------. : The Problem \ : +-------------`---------------------------------------------------------. If you are using IE 6.x (latest) you can still get files into your hard : disk EVEN if IE security is HIGH which make download DISABLED. : : IE 6.x by default will save all .gif .cab .jpg etc,,, when you click : FROM THE MENU "SAVE AS". : This will save whatever .gif or .cab linked to the page. : : That can may FILL IN your hard disk if someone played some tricks with : the HTML page that you are saving. : To see the effect do this: : : 1- Make sure to set your Internet Explorer Security To HIGH : (this will disable download files) this mean your should not accept : file into your hard disk. : 2- From IE menu click "File" then "Save As". : This will save this page to your disk and it will save whatever files I : linked to this page. In this test page I linked 2 files in src tag. : You can see that if you check the source of this page. : : >>> TEST PAGE http://www.safehack.com/testpage/testsave.htm <<< : : This page will save 2 files on your disk about 2.5 meg so be careful : if you are on slow link. : : Imaging someone put 20 hidden image in an HTML page that point to : src="test.cab" X 20 and every file let us say 100 Meg. : When you save you wont save ONLY 100 MegX20 NO you will save 100 X 40 : this because IE will have to get the file into a tmp folder first then : copy it to your disk. : : Ah this can be used in another way too. How about you put one or two : src="test.cab" src="test1.gif" on all your web pages and the src is : linked to a 500 MEG file, in this case NO ONE CAN SAVE YOUR PAGES unless: they like to get the 500 meg file too. Sure this can be avoided if you : know how to save HTML using other method. : : Opera will auto save the .cab file as soon as you open the HTML page. : Another problem with opera is even if you have a small cache size the : file will still get saved and renamed. : : To see that set your opera cache size to one meg and re-open this page : you will notice that opera did in fact save the file and renamed it. : : : +------------. : The Solution \ : +--------------`--------------------------------------------------------. Before you save a page make sure you check the source. Yes it is not the: best way but at least you know what you are expecting. : +-----------------------------------------------------------------------. ________________________________________________________________________ The only secure computer is one that's unplugged, locked in a safe, and buried 20 feet under the ground in a secret location... and i'm not even too sure about that one"--Dennis Huges, FBI. ________________________________________________________________________ Connect yourself to the main computer and let me take you to a cybernetic ride. Are you connected to the right cybernet? If you are, finally you are connected to my brain. ________________________________________________________________________ -=- Use a computer in a ways that ensure respect for your fellow -=-
This archive was generated by hypermail 2b30 : Sun Mar 17 2002 - 00:07:35 PST