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
; H6 e/ n, e! H% o+ e& B4 T3 d, T4 o- Credit goes to: Mostafa Azizi, Soroush Dalili
( E' Q: x( l5 s8 s' o. r# g- Link:http://sourceforge.net/projects/fckeditor/files/FCKeditor/
9 k3 I5 l- q9 Y5 {8 {: U- Description:
, X( ~# y' s( g2 Y& a9 ^6 RThere 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
the protection and upload a file with any extension.
6 v, a6 F4 t. r. k- Reference: http://soroush.secproject.com/blog/2012/11/file-in-the-hole/
' X4 f2 G$ q$ Z8 C- T+ G& O& k- Solution: Please check the provided reference or the vendor website.
$ l0 ]0 N1 \0 m4 I" T' X5 o! w- 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”
, Y* v. S) n9 ~0 c1 @) _5 c6 b: EChange it to:
" N$ @. f7 e- x& D      ConfigAllowedExtensions.Add    “File”,”^(Extensions Here)$”
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/ Z* ?$ Q' W% `/ R( m4 N' sphp测试无效
asp/aspx测试成功：
% E* W3 ~  r8 }, F8 I1 g9 J# |. f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

; C/ F) e5 v% r7 O" N( 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

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