最新FCKEditor ASP上传绕过漏洞

admin

exploiut-db：
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FCKEditor ASP Version 2.6.8 File Upload Protection Bypass

& L: ~7 S7 S( a# U; p- Title: FCKEditor 2.6.8 ASP Version File Upload Protection bypass
- Credit goes to: Mostafa Azizi, Soroush Dalili
- Link:http://sourceforge.net/projects/fckeditor/files/FCKeditor/
& B* G- u, C# m9 G7 D: q# c- Description:
There is no validation on the extensions when FCKEditor 2.6.8 ASP version is
# d& R- s/ G5 j: q" qdealing with the duplicate files. As a result, it is possible to bypass
the protection and upload a file with any extension.
+ B! S' L; o- I" m- 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:
In “config.asp”, wherever you have:
      ConfigAllowedExtensions.Add    “File”,”Extensions Here”
Change it to:
; a8 v: h& R& M$ t$ V      ConfigAllowedExtensions.Add    “File”,”^(Extensions Here)$”
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' g! d2 N/ e1 H# M; N- z, w; {php测试无效
4 s2 M( |8 a3 d& rasp/aspx测试成功：
来到/FCKeditor/editor/filemanager/connectors/test.html
( H6 |8 J, [& r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

, H2 a# E7 _* H& xburpsuite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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$ {8 d9 ]2 o6 A1 z2 h如图，webshell为：http://localhost/userfiles/file/asd(1).asp

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