最新FCKEditor ASP上传绕过漏洞

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exploiut-db：

FCKEditor ASP Version 2.6.8 File Upload Protection Bypass

6 h2 n( Q7 h& H+ f4 a5 l( t- Title: FCKEditor 2.6.8 ASP Version File Upload Protection bypass
- Credit goes to: Mostafa Azizi, Soroush Dalili
- Link:http://sourceforge.net/projects/fckeditor/files/FCKeditor/
8 {7 ?+ n. O! B3 x- Description:
$ Q; E% V1 ~, D- }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
+ B/ \+ E! u  T6 @9 Z4 @& Nthe protection and upload a file with any extension.
! j" j8 ^: e- {" {/ T  k% i9 D- Reference: http://soroush.secproject.com/blog/2012/11/file-in-the-hole/
1 p6 @/ T1 }0 X( ?. B6 ]! q) L- Solution: Please check the provided reference or the vendor website.
" X9 L/ q+ |. n; a! p2 \# D- PoC:http://www.youtube.com/v/1VpxlJ5 ... ;rel=0&vq=hd720
"
Note: Quick patch for FCKEditor 2.6.8 File Upload Bypass:
% M, X2 s: V  t; h0 |0 @! _2 @In “config.asp”, wherever you have:
      ConfigAllowedExtensions.Add    “File”,”Extensions Here”
' F" h1 v+ K5 m: ~. a$ F8 GChange it to:
      ConfigAllowedExtensions.Add    “File”,”^(Extensions Here)$”



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5 Y3 y! }: O; e& \2 f  T0 Y5 Yphp测试无效
# B2 U7 F; s9 _/ @8 d5 L, |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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1 c. h: H6 M; |5 P# |1 Z! `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

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