最新FCKEditor ASP上传绕过漏洞

admin

exploiut-db：

  t! N) X/ e2 S. cFCKEditor ASP Version 2.6.8 File Upload Protection Bypass

! l2 l* {4 k: t- Title: FCKEditor 2.6.8 ASP Version File Upload Protection bypass
- Credit goes to: Mostafa Azizi, Soroush Dalili
2 s+ u9 }2 b( e8 V" C+ x- Link:http://sourceforge.net/projects/fckeditor/files/FCKeditor/
- Description:
% i& X$ t0 R  \- c9 o( [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
: G2 _; O- u4 Ithe protection and upload a file with any extension.
. U* P3 H0 k( \1 s- Reference: http://soroush.secproject.com/blog/2012/11/file-in-the-hole/
- Solution: Please check the provided reference or the vendor website.
/ ]1 s5 U1 _: v3 ~' O- PoC:http://www.youtube.com/v/1VpxlJ5 ... ;rel=0&vq=hd720
"
! w: u) t' T" R/ }Note: Quick patch for FCKEditor 2.6.8 File Upload Bypass:
# @7 s8 E, A) x/ E4 E8 CIn “config.asp”, wherever you have:
; q! G! [$ l# {3 W% ?- b7 L# C# J1 P      ConfigAllowedExtensions.Add    “File”,”Extensions Here”
& U& G$ m4 ]+ t7 kChange it to:
+ W; |1 t" X# M* I" x      ConfigAllowedExtensions.Add    “File”,”^(Extensions Here)$”
% H% h4 o5 @" l7 a( B- J  O

+ H2 R+ g' j$ K/ O& _5 Y6 B
" U8 z5 ]1 c3 ?3 }$ V/ b8 T" X
. _( K* D# s1 h: H" m
' X+ U6 Q3 p6 `( Rphp测试无效
8 K' i' v2 p. vasp/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

burpsuite上传包并修改，repeater
. O/ d4 E" h. t; q/ {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
7 U7 w+ w- s; b' E% T" _