最新FCKEditor ASP上传绕过漏洞

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exploiut-db：

: w# p: K% r$ dFCKEditor ASP Version 2.6.8 File Upload Protection Bypass
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! i0 x. a6 V) w- @6 l& q1 @- Title: FCKEditor 2.6.8 ASP Version File Upload Protection bypass
- Credit goes to: Mostafa Azizi, Soroush Dalili
5 w: y/ ^6 v# _' l- Link:http://sourceforge.net/projects/fckeditor/files/FCKeditor/
- Description:
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
7 g, h: J6 E2 i: m! R4 v- Ethe protection and upload a file with any extension.
- Reference: http://soroush.secproject.com/blog/2012/11/file-in-the-hole/
$ I9 m; w1 V; w) d% R8 C- Solution: Please check the provided reference or the vendor website.
- PoC:http://www.youtube.com/v/1VpxlJ5 ... ;rel=0&vq=hd720
"
Note: Quick patch for FCKEditor 2.6.8 File Upload Bypass:
3 [9 i* z  _3 C9 X4 j2 eIn “config.asp”, wherever you have:
& r) M2 |+ C4 t/ T' e      ConfigAllowedExtensions.Add    “File”,”Extensions Here”
Change it to:
" T( V( Z+ h- }5 y) [1 r+ j      ConfigAllowedExtensions.Add    “File”,”^(Extensions Here)$”


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* ]8 b- t. V* X" Z2 ephp测试无效
5 z& H) U6 z# r% Hasp/aspx测试成功：
# z. Z4 T" R# z4 O' D" w- L/ I0 m( C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

- F4 o6 C0 [% _8 D- cburpsuite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

- x# {" H3 a1 x4 L5 `/ i如图，webshell为：http://localhost/userfiles/file/asd(1).asp

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