最新FCKEditor ASP上传绕过漏洞

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exploiut-db：

# Y; ?7 u& K5 g4 t! BFCKEditor ASP Version 2.6.8 File Upload Protection Bypass
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6 R# a  B( E7 M7 s6 v( a4 M; |7 [/ c- Title: FCKEditor 2.6.8 ASP Version File Upload Protection bypass
( x  g0 m% t2 @" d6 J7 r+ y) G- Credit goes to: Mostafa Azizi, Soroush Dalili
5 f4 b) U! H$ ]2 e0 e" m0 p  N% N- Link:http://sourceforge.net/projects/fckeditor/files/FCKeditor/
- Description:
There 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
the protection and upload a file with any extension.
' Q5 T( F, ~1 R  N: D1 P* t- Reference: http://soroush.secproject.com/blog/2012/11/file-in-the-hole/
- 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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& {$ J  y5 j1 _# K( a6 QNote: Quick patch for FCKEditor 2.6.8 File Upload Bypass:
In “config.asp”, wherever you have:
      ConfigAllowedExtensions.Add    “File”,”Extensions Here”
2 _# O, q* {: aChange it to:
      ConfigAllowedExtensions.Add    “File”,”^(Extensions Here)$”
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php测试无效
asp/aspx测试成功：
来到/FCKeditor/editor/filemanager/connectors/test.html
4 N/ d, x/ o2 F  }+ D( d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

% F/ G5 V( k: o- M  Y9 ^burpsuite上传包并修改，repeater
: f  e3 l# h% o8 q! a! z: r名字改为asd.asp%00txt    然后把%00专为URL编码上传后得到asd(1).asp

9 t* g+ ]- Z  D如图，webshell为：http://localhost/userfiles/file/asd(1).asp
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