最新FCKEditor ASP上传绕过漏洞

admin

exploiut-db：

+ g$ O( {# I# X2 Z0 Y6 oFCKEditor ASP Version 2.6.8 File Upload Protection Bypass
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. z- T9 y& T$ Q- Title: FCKEditor 2.6.8 ASP Version File Upload Protection bypass
; e: w* S1 W1 R* E; E- Credit goes to: Mostafa Azizi, Soroush Dalili
' }8 o  [$ }( [1 g0 D8 g0 ^- Link:http://sourceforge.net/projects/fckeditor/files/FCKeditor/
) j+ @+ V* x1 d- Description:
There is no validation on the extensions when FCKEditor 2.6.8 ASP version is
% [; x) \$ z  c) B. o+ l' }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/
- 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”
1 ~" J3 z' R  N4 jChange it to:
      ConfigAllowedExtensions.Add    “File”,”^(Extensions Here)$”





  k+ G: f) d# ?, j% I8 R6 lphp测试无效
asp/aspx测试成功：
! d0 F$ q* ^3 z8 c# D来到/FCKeditor/editor/filemanager/connectors/test.html
$ R4 Y8 }8 N+ x! G2 l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

$ c/ `/ L# Q: u( L7 p5 E3 \" Gburpsuite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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如图，webshell为：http://localhost/userfiles/file/asd(1).asp