最新FCKEditor ASP上传绕过漏洞

admin

exploiut-db：

FCKEditor ASP Version 2.6.8 File Upload Protection Bypass
& w7 f( `' _3 }9 L% f
- 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/
- Description:
There is no validation on the extensions when FCKEditor 2.6.8 ASP version is
. o9 U4 l2 I7 x: d6 d- edealing with the duplicate files. As a result, it is possible to bypass
the protection and upload a file with any extension.
0 ~2 c. D  W6 U- ^- 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
, ^* y+ j: ?1 r* ^"
+ n  Y- [$ }7 r6 qNote: Quick patch for FCKEditor 2.6.8 File Upload Bypass:
& p# T6 d& G$ v, l0 aIn “config.asp”, wherever you have:
5 t/ {! t& H4 }5 s7 Z/ U1 Q6 d      ConfigAllowedExtensions.Add    “File”,”Extensions Here”
Change it to:
4 B6 u  d$ ^3 M      ConfigAllowedExtensions.Add    “File”,”^(Extensions Here)$”



* h0 j2 u/ c7 s* Z
) v( Q( ^' R& o) T, b
+ _* f7 F: C* G" q4 O% \+ P7 _php测试无效
asp/aspx测试成功：
来到/FCKeditor/editor/filemanager/connectors/test.html
0 r3 D) X) h+ N/ Y; W5 i4 \& {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
名字改为asd.asp%00txt    然后把%00专为URL编码上传后得到asd(1).asp
0 W& S# t) \9 l  z3 E- F
如图，webshell为：http://localhost/userfiles/file/asd(1).asp
" _) S( k! X0 x1 q  N# U