---------------------------------------------------------------------- SNS Advisory No.56 TSAC Web package/IIS 5.1 connect.asp Cross-site Scripting Vulnerability Problem first discovered: Wed, 17 Apr 2002 Published: Fri, 11 Oct 2002 Reference: http://www.lac.co.jp/security/english/snsadv_e/56_e.html ---------------------------------------------------------------------- Overview: --------- A cross-site scripting vulnerability in the ASP file has been reported in the TSAC Web package and Remote Desktop Web Connection, which is an option component of IIS 5.1. Description: ------------ Microsoft Terminal Services Advanced Client (TSAC) is an ActiveX control that can be used to run Terminal Services sessions within Microsoft Internet Explorer. The TSAC Web package, which can be installed on Internet Information Service 4.0 and later versions, ships with a downloadable ActiveX Control and sample Web pages for Internet Explorer. As an option, Windows XP Professional Edition includes IIS 5.1, which provides the Remote Desktop Web Connection component. This component is installed by default with IIS 5.1. A cross-site scripting vulnerability has been found in the connect.asp shipped with the TSAC Web package and the Remote Desktop Web Connection. The problem occurs due to the fact that connect.asp does not properly sanitize external input. Tested versions: ---------------- TSAC Web package (TSWEBSETUP.EXE) Internet Information Services 5.1 Tested OS: ---------- Windows 2000 Server [Japanese] Windows XP Professional Edition [Japanese] Solution: --------- Solution is available at: Q327521 : MS02-046: Buffer Overrun in TSAC ActiveX Control Might Allow Code Execution http://support.microsoft.com/default.aspx?scid=KB;EN-US;Q327521 Discovered by: -------------- ARAI Yuu y.araiat_private Acknowledgements: ----------------- Thanks to: Microsoft Security Response Center Security Response Team of Microsoft Asia Limited Disclaimer: ----------- All information in these advisories are subject to change without any advanced notices neither mutual consensus, and each of them is released as it is. LAC Co.,Ltd. is not responsible for any risks of occurrences caused by applying those information. ------------------------------------------------------------------ SecureNet Service(SNS) Security Advisory <snsadvat_private> Computer Security Laboratory, LAC http://www.lac.co.jp/security/
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