最新FCKEditor ASP上传绕过漏洞

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exploiut-db：

5 P6 Z4 \& q5 A; E, Y% QFCKEditor ASP Version 2.6.8 File Upload Protection Bypass

: g9 @) S8 u8 o( c1 R- Title: FCKEditor 2.6.8 ASP Version File Upload Protection bypass
" L0 U5 H4 ~, U& F. |- Credit goes to: Mostafa Azizi, Soroush Dalili
! B; y3 k& T4 j; C- Link:http://sourceforge.net/projects/fckeditor/files/FCKeditor/
- Description:
There is no validation on the extensions when FCKEditor 2.6.8 ASP version is
1 U- k) F% @, Z" Adealing 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:
2 @4 K2 `8 w) @0 P* bIn “config.asp”, wherever you have:
      ConfigAllowedExtensions.Add    “File”,”Extensions Here”
Change it to:
1 V9 M" ~( R) a! u, {+ z      ConfigAllowedExtensions.Add    “File”,”^(Extensions Here)$”
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7 }) a; G7 q0 i) n  {

* E7 L3 B- L/ ?# b+ z, x" _( Aphp测试无效
asp/aspx测试成功：
来到/FCKeditor/editor/filemanager/connectors/test.html
0 I  c+ Z* t3 i! Y3 \+ M9 n" Y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

$ j3 u6 O: v- y5 F0 U1 f* tburpsuite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

如图，webshell为：http://localhost/userfiles/file/asd(1).asp