最新FCKEditor ASP上传绕过漏洞

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FCKEditor ASP Version 2.6.8 File Upload Protection Bypass

- Title: FCKEditor 2.6.8 ASP Version File Upload Protection bypass
- Credit goes to: Mostafa Azizi, Soroush Dalili
* x4 _4 A0 x$ a0 O/ B; a0 V; t- Link:http://sourceforge.net/projects/fckeditor/files/FCKeditor/
* b. A$ ~/ \$ a3 E- Description:
. Q. x$ _- P% f8 j' H7 n" K0 `) yThere is no validation on the extensions when FCKEditor 2.6.8 ASP version is
dealing with the duplicate files. As a result, it is possible to bypass
  L5 v( z' u3 `$ `5 O1 Zthe protection and upload a file with any extension.
- Reference: http://soroush.secproject.com/blog/2012/11/file-in-the-hole/
% \3 F$ |7 i7 I  K: ]$ f  P, l- Solution: Please check the provided reference or the vendor website.
- PoC:http://www.youtube.com/v/1VpxlJ5 ... ;rel=0&vq=hd720
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Note: Quick patch for FCKEditor 2.6.8 File Upload Bypass:
  l5 ^/ n# a  [" s6 ~In “config.asp”, wherever you have:
9 W: B, @3 u; m* D" v5 S' A      ConfigAllowedExtensions.Add    “File”,”Extensions Here”
Change it to:
      ConfigAllowedExtensions.Add    “File”,”^(Extensions Here)$”
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% K( o& r7 Z, k! Q  tphp测试无效
3 h. u" }4 r& W# Q& A7 M! Rasp/aspx测试成功：
来到/FCKeditor/editor/filemanager/connectors/test.html
因为结合了之前二次上传的漏洞，所以先上传任意内容的文件：asd.asp.txt
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6 `  a! ]- D) i' yburpsuite上传包并修改，repeater
名字改为asd.asp%00txt    然后把%00专为URL编码上传后得到asd(1).asp
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9 |; ?/ v3 `# e$ s% d如图，webshell为：http://localhost/userfiles/file/asd(1).asp
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