最新FCKEditor ASP上传绕过漏洞

admin

exploiut-db：
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FCKEditor ASP Version 2.6.8 File Upload Protection Bypass
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- @* d0 j# K3 a+ i  l- Title: FCKEditor 2.6.8 ASP Version File Upload Protection bypass
1 L% v! G5 X0 q- Credit goes to: Mostafa Azizi, Soroush Dalili
- 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.
- Reference: http://soroush.secproject.com/blog/2012/11/file-in-the-hole/
! ~$ E' k' w" @4 \" D- Solution: Please check the provided reference or the vendor website.
/ w% O0 _; b) D* r  F. G- 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:
In “config.asp”, wherever you have:
      ConfigAllowedExtensions.Add    “File”,”Extensions Here”
Change it to:
      ConfigAllowedExtensions.Add    “File”,”^(Extensions Here)$”
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php测试无效
asp/aspx测试成功：
/ @. ~, I8 p6 D) l1 o- |9 V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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burpsuite上传包并修改，repeater
5 u* m1 J. l7 y1 [' C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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8 Y, o( D7 R# z如图，webshell为：http://localhost/userfiles/file/asd(1).asp