最新FCKEditor ASP上传绕过漏洞

admin

exploiut-db：

) W& P: E: o) S5 o0 NFCKEditor ASP Version 2.6.8 File Upload Protection Bypass
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: J! j8 Z0 j0 F3 L- N' l- Title: FCKEditor 2.6.8 ASP Version File Upload Protection bypass
9 }, W* T4 [% z: I7 q5 S2 f5 b- Credit goes to: Mostafa Azizi, Soroush Dalili
- [* r( K& }. j) R/ y- Link:http://sourceforge.net/projects/fckeditor/files/FCKeditor/
- Description:
There is no validation on the extensions when FCKEditor 2.6.8 ASP version is
. c# {# Y7 Z1 x7 r* h  _dealing with the duplicate files. As a result, it is possible to bypass
: Q* [7 g; Y1 r2 Z1 d# r6 \the protection and upload a file with any extension.
6 s! ?( Y3 O' s" Q. i" O( O- Reference: http://soroush.secproject.com/blog/2012/11/file-in-the-hole/
# T6 i. E! Y- _$ H0 W* M5 @; ^) o  y# L# u- 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:
! d; L  h. }7 F      ConfigAllowedExtensions.Add    “File”,”^(Extensions Here)$”

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) f8 Q/ a- k' c/ w3 j  }


php测试无效
9 j2 j# R2 A" w, K! F/ P( m* k- Gasp/aspx测试成功：
" z) x  `9 c' ^8 D  N来到/FCKeditor/editor/filemanager/connectors/test.html
" ^5 g, ^* C1 j3 E0 c2 T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

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