最新FCKEditor ASP上传绕过漏洞

admin

exploiut-db：

FCKEditor ASP Version 2.6.8 File Upload Protection Bypass
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- Title: FCKEditor 2.6.8 ASP Version File Upload Protection bypass
. r  ^, z1 J) K- Credit goes to: Mostafa Azizi, Soroush Dalili
- Link:http://sourceforge.net/projects/fckeditor/files/FCKeditor/
- Description:
There is no validation on the extensions when FCKEditor 2.6.8 ASP version is
5 q; A# J' s" l, r$ }dealing with the duplicate files. As a result, it is possible to bypass
the protection and upload a file with any extension.
9 N  S( i+ A, l) Z* c7 R- Reference: http://soroush.secproject.com/blog/2012/11/file-in-the-hole/
' V+ L: [; d) v: l; Y% O. z- Solution: Please check the provided reference or the vendor website.
  @  H: v" q/ {4 J9 @5 p9 d/ a- 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:
/ G* z( ]* V6 @: q5 @3 b$ g) b      ConfigAllowedExtensions.Add    “File”,”Extensions Here”
. ]; t3 y" y. u! `: WChange it to:
      ConfigAllowedExtensions.Add    “File”,”^(Extensions Here)$”


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" ]5 t9 O. V' ^; ~" R4 P6 vphp测试无效
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

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

" w5 H2 U% F% F7 I5 g) d如图，webshell为：http://localhost/userfiles/file/asd(1).asp
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