__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN Microsoft Unchecked Buffer in Windows Redirector Vulnerability [Microsoft Security Bulletin MS03-005] February 6, 2003 18:00 GMT Number N-039 ______________________________________________________________________________ PROBLEM: The Windows Redirector is used by a Windows client to access files, whether local or remote, regardless of the underlying network protocols in use. A vulnerability exists in the implementation of the Windows Redirector on Windows XP because an unchecked buffer is used to receive parameter information. PLATFORM: Microsoft Windows XP DAMAGE: By providing malformed data to the Windows Redirector, an attacker could possibly cause the system to fail, or if the data was crafted in a particular way, could run code of the attacker’s choice. SOLUTION: Apply available patches. ______________________________________________________________________________ VULNERABILITY The risk is MEDIUM. This vulnerability cannot be exploited ASSESSMENT: remotely. An attacker would require the ability to log onto the system interactively in order to run programs that use the Windows Redirector. Windows XP systems that are not shared between users would not be at risk. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/n-039.shtml ORIGINAL BULLETIN: http://www.microsoft.com/technet/treeview/default.asp?url= /technet/security/bulletin/MS03-005.asp PATCHES: 32-bit Edition: http://microsoft.com/downloads/details.aspx?FamilyId= 33DABD1F-505E-48ED-B9BD-CDAC0F8A2BC1&displaylang=en 64-bit Edition: http://microsoft.com/downloads/details.aspx?FamilyId= A2258F4E-9A69-4537-9469-0DDEB4BB76F8&displaylang=en ______________________________________________________________________________ [***** Start Microsoft Security Bulletin MS03-005 *****] Microsoft Security Bulletin MS03-005 Unchecked Buffer in Windows Redirector Could Allow Privilege Elevation (810577) Originally posted: February 5, 2003 Summary Who should read this bulletin: Customers using Microsoft® Windows® XP. Impact of vulnerability: Local elevation of privileges Maximum Severity Rating: Important Recommendation: Customers should consider applying the patch. Affected Software: Microsoft Windows XP Technical details Technical description: The Windows Redirector is used by a Windows client to access files, whether local or remote, regardless of the underlying network protocols in use. For example, the "Add a Network Place" Wizard or the NET USE command can be used to map a network share as a local drive, and the Windows Redirector will handle the routing of information to and from the network share. A security vulnerability exists in the implementation of the Windows Redirector on Windows XP because an unchecked buffer is used to receive parameter information. By providing malformed data to the Windows Redirector, an attacker could cause the system to fail, or if the data was crafted in a particular way, could run code of the attacker’s choice. Mitigating factors: An attacker would require the ability to log onto the system interactively in order to run programs that use the Windows Redirector. This vulnerability cannot be exploited remotely. Windows XP systems that are not shared between users would not be at risk. Severity Rating: Windows XP Important The above assessment is based on the types of systems affected by the vulnerability, their typical deployment patterns, and the effect that exploiting the vulnerability would have on them. Vulnerability identifier: CAN-2003-0004 Tested Versions: Microsoft tested Windows XP to assess whether it is affected by these vulnerabilities. Windows NT 4.0, Windows NT 4.0, Terminal Server Edition, and Windows 2000 do not contain the code in question and are not affected by this vulnerability. Patch availability Download locations for this patch Windows XP: 32-bit Edition 64-bit Edition Additional information about this patch Installation platforms: This patch can be installed on systems running Windows XP Gold and Windows XP Service Pack 1. Inclusion in future service packs: The fix for this issue will be included in Windows XP Service Pack 2. Reboot needed: Yes Patch can be uninstalled: Yes Superseded patches: None. Verifying patch installation: Windows XP Gold: To verify that the patch has been installed on the machine, confirm that the following registry key has been created on the machine: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\Windows XP\SP1\Q810577 To verify the individual files, use the date/time and version information provided in the following registry key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\Windows XP\SP1\Q810577\Filelist Windows XP Service Pack 1: To verify that the patch has been installed on the machine, confirm that the following registry key has been created on the machine: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\Windows XP\SP2\Q810577 To verify the individual files, use the date/time and version information provided in the following registry key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\Windows XP\SP2\Q810577\FilelistTo Caveats: None Localization: Localized versions of this patch are available at the locations discussed in "Patch Availability". Obtaining other security patches: Patches for other security issues are available from the following locations: Security patches are available from the Microsoft Download Center, and can be most easily found by doing a keyword search for "security_patch". Patches for consumer platforms are available from the WindowsUpdate web site Other information: Acknowledgments Microsoft thanks NSFocus for reporting this issue to us and working with us to protect customers. Support: Microsoft Knowledge Base article 810577 discusses this issue and will be available approximately 24 hours after the release of this bulletin. Knowledge Base articles can be found on the Microsoft Online Support web site. Technical support is available from Microsoft Product Support Services. There is no charge for support calls associated with security patches. Security Resources: The Microsoft TechNet Security Web Site provides additional information about security in Microsoft products. Disclaimer: The information provided in the Microsoft Knowledge Base is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. Revisions: V1.0 February 5, 2003: Bulletin Created. [***** End Microsoft Security Bulletin MS03-005 *****] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of Microsoft Corporation for the information contained in this bulletin. _______________________________________________________________________________ CIAC, the Computer Incident Advisory Capability, is the computer security incident response team for the U.S. Department of Energy (DOE) and the emergency backup response team for the National Institutes of Health (NIH). CIAC is located at the Lawrence Livermore National Laboratory in Livermore, California. CIAC is also a founding member of FIRST, the Forum of Incident Response and Security Teams, a global organization established to foster cooperation and coordination among computer security teams worldwide. CIAC services are available to DOE, DOE contractors, and the NIH. CIAC can be contacted at: Voice: +1 925-422-8193 (7x24) FAX: +1 925-423-8002 STU-III: +1 925-423-2604 E-mail: ciac@ciac.org Previous CIAC notices, anti-virus software, and other information are available from the CIAC Computer Security Archive. World Wide Web: http://www.ciac.org/ Anonymous FTP: ftp.ciac.org PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing communities receive CIAC bulletins. If you are not part of these communities, please contact your agency's response team to report incidents. Your agency's team will coordinate with CIAC. The Forum of Incident Response and Security Teams (FIRST) is a world-wide organization. A list of FIRST member organizations and their constituencies can be obtained via WWW at http://www.first.org/. This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial products, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation or favoring by the United States Government or the University of California. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or the University of California, and shall not be used for advertising or product endorsement purposes. 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