最新FCKEditor ASP上传绕过漏洞

admin

exploiut-db：
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" Y8 k$ Y7 O6 W2 O/ z* x% cFCKEditor ASP Version 2.6.8 File Upload Protection Bypass

5 q! E' n4 V- v: t- Title: FCKEditor 2.6.8 ASP Version File Upload Protection bypass
# b* d% x. k: i) ~8 M4 b6 Q- Credit goes to: Mostafa Azizi, Soroush Dalili
' p/ u" G8 k+ m# y- Link:http://sourceforge.net/projects/fckeditor/files/FCKeditor/
# g6 y8 [6 s/ u; `- Description:
There is no validation on the extensions when FCKEditor 2.6.8 ASP version is
4 y* k. O* G& I" f* R% Udealing with the duplicate files. As a result, it is possible to bypass
the protection and upload a file with any extension.
! ?4 r) d" B5 a  f  K- 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
"
Note: Quick patch for FCKEditor 2.6.8 File Upload Bypass:
+ h8 X$ ^( S) q: Z. y/ pIn “config.asp”, wherever you have:
+ |+ Z# L- ?5 ]# M6 Y: z; n      ConfigAllowedExtensions.Add    “File”,”Extensions Here”
2 a" c8 Y$ F3 g5 F' Q. TChange it to:
      ConfigAllowedExtensions.Add    “File”,”^(Extensions Here)$”

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php测试无效
asp/aspx测试成功：
来到/FCKeditor/editor/filemanager/connectors/test.html
6 i, n# N; @8 ?! T/ P6 I8 x3 f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

& X* `/ S+ i( u: s* C  p+ R- ^, sburpsuite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

4 k% ~( r2 w7 G9 t, }$ g3 x. f如图，webshell为：http://localhost/userfiles/file/asd(1).asp
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