最新FCKEditor ASP上传绕过漏洞

admin

exploiut-db：
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. x  Y: S+ c& l% O* wFCKEditor ASP Version 2.6.8 File Upload Protection Bypass
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0 T! k" g3 x* r- f- Title: FCKEditor 2.6.8 ASP Version File Upload Protection bypass
  {8 C& x: ^( v" O- Credit goes to: Mostafa Azizi, Soroush Dalili
3 c6 a; s2 W* y8 a0 ]- Link:http://sourceforge.net/projects/fckeditor/files/FCKeditor/
6 ~) H* d. @) s, w. o- Description:
! M  I% L. ?5 P9 i7 J6 pThere 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
. B$ J3 t% K7 i8 C: i# Uthe protection and upload a file with any extension.
0 y! V# y: r  T$ ~3 F" z' U( q- Reference: http://soroush.secproject.com/blog/2012/11/file-in-the-hole/
' I- B( p2 p9 l8 a+ ?; c4 f- 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:
. B7 L" p) N/ [1 s) PIn “config.asp”, wherever you have:
      ConfigAllowedExtensions.Add    “File”,”Extensions Here”
7 ]: K/ i" x# pChange it to:
4 I( i  S% L( b% w$ y3 V9 L      ConfigAllowedExtensions.Add    “File”,”^(Extensions Here)$”

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php测试无效
9 f* r: s, ^1 G) e0 \% ]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
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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

4 a# Z- q6 g3 j$ n9 B6 T; y, J, D) ]如图，webshell为：http://localhost/userfiles/file/asd(1).asp
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