WinGate Information Disclosure Vulnerability iDEFENSE Security Advisory 07.01.04: I. BACKGROUND WinGate is an Internet sharing and proxy application that allows for monitoring and remote administration. More information is available at http://www.wingate.com/product-wingate.php II. DESCRIPTION Remote exploitation of an input validation vulnerability in Qbik WinGate allows attackers to retrieve arbitrary system files. WinGate authenticates proxy users via a Java applet served through a built-in web server. The following request causes the server to retrieve a file from its root directory which is equivalent to the install directory: http://wingate.example.com/wingate-internal/filename It is possible to retrieve arbitrary files outside the context of the root directory by preceding the path with an extra slash in the case of WinGate 5 and two extra slashes in the case of WinGate 6. For example: http://wingate5.example.com/wingate-internal//path http://wingate6.example.com/wingate-internal///path III. ANALYSIS Successful exploitation allows unauthenticated remote attackers to retrieve the contents of arbitrary files. WinGate, by default, runs under the context of localsystem allowing for the retrieval of backup Windows SAM files. IV. DETECTION iDEFENSE has confirmed that WinGate version 5.2.3 build 901 and version 6.0 beta 2 build 942 are vulnerable. Version 5.0.5 is also reported as vulnerable. It is suspected that earlier versions are vulnerable as well. V. WORKAROUND Disable the WWW Proxy server. VI. VENDOR RESPONSE "In general people don't bind their WWW Proxy to external interfaces, so this exploit is generally not available from the internet. However it does seem to bypass local LAN security." WinGate beta 3 (build 959) addresses the vulnerabilities and is available for download at: http://www.wingate.com/download.php VII. CVE INFORMATION The Common Vulnerabilities and Exposures (CVE) project has assigned the names CAN-2004-0577 and CAN-2004-0578 to these issues. This is a candidate for inclusion in the CVE list (http://cve.mitre.org), which standardizes names for security problems. VIII. DISCLOSURE TIMELINE 09/27/03 Exploit acquired by iDEFENSE 06/04/04 Initial vendor notification 06/10/04 Secondary vendor notification 06/21/04 iDEFENSE clients notified 06/23/04 Initial vendor response 07/01/04 Public Disclosure IX. CREDIT An anonymous contributor is credited with discovering this vulnerability. Get paid for vulnerability research http://www.idefense.com/poi/teams/vcp.jsp X. LEGAL NOTICES Copyright © 2004 iDEFENSE, Inc. Permission is granted for the redistribution of this alert electronically. It may not be edited in any way without the express written consent of iDEFENSE. If you wish to reprint the whole or any part of this alert in any other medium other than electronically, please email customerservice@idefense.com for permission. Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.