Web Wiz Rich Text Editor Directory traversal + HTM/HTML filecreation on the server

2008.01.29
Credit: bugreport
Risk: Low
Local: No
Remote: Yes
CWE: N/A

########################## 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


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