最新FCKEditor ASP上传绕过漏洞

admin

exploiut-db：
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: L6 o% }# H2 h3 U) n( b/ kFCKEditor ASP Version 2.6.8 File Upload Protection Bypass

- Title: FCKEditor 2.6.8 ASP Version File Upload Protection bypass
% z& X" |7 u9 C$ d# }0 m- Credit goes to: Mostafa Azizi, Soroush Dalili
- Link:http://sourceforge.net/projects/fckeditor/files/FCKeditor/
- Description:
# F+ [7 o* X- L, IThere 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
% o9 [2 S, S- u, s0 j& W# Dthe protection and upload a file with any extension.
& I+ n9 o+ e  n- v- Reference: http://soroush.secproject.com/blog/2012/11/file-in-the-hole/
  Y( G9 k2 s0 g9 q5 }- 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:
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：
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
名字改为asd.asp%00txt    然后把%00专为URL编码上传后得到asd(1).asp

- g" F! H/ Q, Y" f: R& b如图，webshell为：http://localhost/userfiles/file/asd(1).asp
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