最新FCKEditor ASP上传绕过漏洞

admin

exploiut-db：

  r+ V" m+ W2 k9 v- cFCKEditor ASP Version 2.6.8 File Upload Protection Bypass
- @7 f) i7 ]( y2 O! O, w) R
( I* x" M4 M- j5 i- Title: FCKEditor 2.6.8 ASP Version File Upload Protection bypass
- Credit goes to: Mostafa Azizi, Soroush Dalili
9 Q& b- s9 j6 y+ o- Link:http://sourceforge.net/projects/fckeditor/files/FCKeditor/
' o$ v7 p- O- @. y- P- 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
the protection and upload a file with any extension.
1 o4 r3 F- o3 M3 r, [3 q+ F, y- T: H- 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
& B4 O2 {% c  q5 ?; t; s2 L, F"
Note: Quick patch for FCKEditor 2.6.8 File Upload Bypass:
In “config.asp”, wherever you have:
5 v% N* `. G; ^4 Q      ConfigAllowedExtensions.Add    “File”,”Extensions Here”
; d8 H) w+ |: y' {& ?. [8 ?  p" x3 NChange it to:
' E# q  @3 s8 x5 T) F      ConfigAllowedExtensions.Add    “File”,”^(Extensions Here)$”
9 c, a' f# m# n4 ?7 J
# D5 k6 P- x9 \, @. o( J* [


' ^% p6 b* X6 \+ n. U1 V# R6 A
php测试无效
asp/aspx测试成功：
. m1 W9 i" a. |, R; R5 ?* [来到/FCKeditor/editor/filemanager/connectors/test.html
8 H* [/ U/ [; o- ?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
/ T; H9 v3 u- R" R
burpsuite上传包并修改，repeater
$ c' z  g, s' r0 z& i' w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
9 n+ F2 l& H- S- \' q0 q