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

From: <admin_at_bugreport.ir>
Date: Wed, 23 Jan 2008 11:06:27 +0330

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#
# 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.
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- Description:
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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.

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- Vulnerability:
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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

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- Fast Solution :
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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

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- Credit :
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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
Received on Jan 23 2008