bugtraq - Web Wiz Rich Text Editor Directory traversal + HTM/HTML file creation on the server

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Date: Wed, 23 Jan 2008 11:06:27 +0330
From: admin@...report.ir
To: bugtraq@...urityfocus.com
Subject: Web Wiz Rich Text Editor Directory traversal + HTM/HTML file
	creation on the server

########################## WwW.BugReport.ir  
###########################################
#
#      AmnPardaz Security Research Team
#
# Title: Web Wiz Rich Text Editor(TM)
# Vendor: http://www.webwizguide.com/
# Bug: Directory traversal + HTM/HTML file creation on the server
# Vulnerable Version: 4.0
# Exploit: Available
# Fix Available: No! Fast Solution is available.
###################################################################################


####################
- Description:
####################
Web Wiz Rich Text Editor (RTE) is a free WYSIWYG HTML Rich Text Editor  
that replaces standard textarea's with an advanced Word style HTMLarea.

####################
- Vulnerability:
####################
Input passed to the FolderName parameter in "RTE_file_browser.asp" is  
not properly sanitised before being used. This can be exploited to  
list directories, list txt and list zip files through directory  
traversal attacks.
Also, "RTE_file_browser.asp" does not check user's session and an  
unauthenticated attacker can perform this attack.
Moreover, by using "RTE_popup_save_file.asp" attacker can make his/her  
HTML or HTM file on the server, so this can be used in XSS attacks or  
making fake pages.

-POC:
http://[WebWiz  
RTE]/RTE_file_browser.asp?look=save&sub=\.....\\\.....\\\.....\\\.....\\\.....\\\
http://[WebWiz RTE]/RTE_popup_save_file.asp

####################
- Fast Solution :
####################
1- You can see below lines in "RTE_file_browser.asp"

	'Stip path tampering for security reasons
	strSubFolderName = Replace(strSubFolderName, "../", "", 1, -1, 1)
	strSubFolderName = Replace(strSubFolderName, "..\", "", 1, -1, 1)
	strSubFolderName = Replace(strSubFolderName, "./", "", 1, -1, 1)
	strSubFolderName = Replace(strSubFolderName, ".\", "", 1, -1, 1)

Only add this to them:
	strSubFolderName = Replace(strSubFolderName, "/", "\", 1, -1, 1)
	strSubFolderName = Replace(strSubFolderName, "\\", "\", 1, -1, 1)
	strSubFolderName = Replace(strSubFolderName, "..", "", 1, -1, 1)
2- Rename "RTE_popup_save_file.asp" till main solution by vendor

####################
- Credit :
####################
Original Advisory: http://www.bugreport.ir/?/31
AmnPardaz Security Research & Penetration Testing Group
Contact: admin[4t}bugreport{d0t]ir
WwW.BugReport.ir
WwW.AmnPardaz.com