最新FCKEditor ASP上传绕过漏洞

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exploiut-db：

4 N$ {  L  q0 n! i* C- p0 |FCKEditor ASP Version 2.6.8 File Upload Protection Bypass

- Title: FCKEditor 2.6.8 ASP Version File Upload Protection bypass
# _# P2 k- q( N' p- Credit goes to: Mostafa Azizi, Soroush Dalili
- Link:http://sourceforge.net/projects/fckeditor/files/FCKeditor/
/ z" e! @3 H2 N' h; ]+ [% }- 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
3 U  @3 D4 n* _) ^0 vthe protection and upload a file with any extension.
- Reference: http://soroush.secproject.com/blog/2012/11/file-in-the-hole/
$ ?6 q( S4 s4 P/ r9 n$ H3 C- Solution: Please check the provided reference or the vendor website.
- PoC:http://www.youtube.com/v/1VpxlJ5 ... ;rel=0&vq=hd720
"
! U9 k% [. Y0 [/ |* |Note: Quick patch for FCKEditor 2.6.8 File Upload Bypass:
  X7 I9 V2 G/ {0 K+ c9 `) n) a; [In “config.asp”, wherever you have:
* d) F- d  C0 O* f& p, o      ConfigAllowedExtensions.Add    “File”,”Extensions Here”
' ~$ I; I5 m, C8 V+ zChange it to:
      ConfigAllowedExtensions.Add    “File”,”^(Extensions Here)$”

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php测试无效
  }- k% L8 a3 R; I( x- S  r: qasp/aspx测试成功：
  i$ J3 D, \1 K0 S! j8 C+ W来到/FCKeditor/editor/filemanager/connectors/test.html
) x# q" n- l9 l$ \1 @. k' \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
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$ \% a; N. \" `; ]3 \) \/ u& {6 [如图，webshell为：http://localhost/userfiles/file/asd(1).asp
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