DOCUMENT:Q248399 09-MAY-2002 [winnt] TITLE :MS00-007: Shared Workstation Setup May Permit Access to Recycle PRODUCT :Microsoft Windows NT PROD/VER::4.0,4.0 SP4,4.0 SP5,4.0 SP6 OPER/SYS: KEYWORDS:kbenv kbSecurity kbWinNT400PreSP7Fix kbgraphxlinkcritical KbSECBulletin ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Workstation version 4.0 - Microsoft Windows NT Server versions 4.0, 4.0 SP4, 4.0 SP5, 4.0 SP6, Terminal Server Edition ------------------------------------------------------------------------------- SYMPTOMS ======== On a shared computer, it may be possible for a user to create a folder in the %SystemRoot\Recycler folder that is then assigned to another user based on the Security Identifier (SID) number. If you do this, a malicious user may assign themselves extended rights to the newly created Recycle Bin folder before it is assigned to another user. This allows someone the ability to insert files into a user's Recycle Bin or permanently delete a user's files located in that specific Recycle Bin. This vulnerability does not allow the malicious user to read the files in the Recycle Bin folder. NOTE: This patch does not apply to computer's that use FAT partitions because disk security features cannot be enabled on these computers. RESOLUTION ========== Windows NT 4.0 -------------- To resolve this problem, obtain the individual package referenced below or obtain the Windows NT 4.0 Security Rollup Package. For additional information on the SRP, click the article number below to view the article in the Microsoft Knowledge Base: Q299444 Post-Windows NT 4.0 Service Pack 6a Security Rollup Package (SRP) The following files are available for download from the Microsoft Download Center: NOTE: This patch only applies to Internet Explorer 4.0 without Active Desktop enabled. If you apply this patch to a computer running IE 4.0 with Active Desktop enabled, it will appear that the patch installed correctly; however, Shell32.dll is not replaced. x86: DownloadDownload Q248399i.exe now (http://www.microsoft.com/downloads/release.asp?ReleaseID=22155) Alpha: DownloadDownload Q248399a.exe now (http://www.microsoft.com/downloads/release.asp?ReleaseID=22155) For additional information about how to download Microsoft Support files, click the article number below to view the article in the Microsoft Knowledge Base: Q119591 How to Obtain Microsoft Support Files from Online Services Microsoft used the most current virus detection software available on the date of posting to scan this file for viruses. After it is posted, the file is housed on secure servers that prevent any unauthorized changes to the file. The English-language version of this fix should have the following file attributes or later: Date Time Size File name Platform ------------------------------------------------------------- 01/18/00 02:47p 1,280,784 Shell32.dll x86 01/18/00 02:47p 1,857,808 Shell32.dll Alpha Windows NT Server 4.0, Terminal Server Edition ---------------------------------------------- To resolve this problem, obtain the Windows NT Server 4.0, Terminal Server Edition, Security Rollup Package (SRP). For additional information about the SRP, click the article number below to view the article in the Microsoft Knowledge Base: Q317636 Windows NT Server 4.0, Terminal Server Edition, Security Rollup Package STATUS ====== Microsoft has confirmed that this problem could result in some degree of security vulnerability in Windows NT 4.0 and Windows NT Server 4.0, Terminal Server Edition. MORE INFORMATION ================ The Windows NT Recycle Bin for a user maps to a folder in %SystemRoot%\Recycler. The name of the folder is based on the owner's SID. The folder is created the first time the user deletes a file, and the owner is given the only permissions to it. However, if a malicious user can create the folder before the real one is created, that user could assign permissions that give them the ability to delete files from it or add files to it. There are several significant limitations that make it extremely difficult to exploit this vulnerability. The malicious user would need to share a machine with the other user, and would need to create the bogus Recycle Bin before the user's bona fide folder were created. This vulnerability only enables the malicious user to take action against the Recycle Bin on the particular machine that is attacked. The vulnerability does not allow the malicious user to read any files in the other user's Recycle Bin, nor would it give him or her a means of inducing the other user to retrieve a bogus file from it. For related information on this problem, please visit the following Microsoft Web site: http://www.microsoft.com/technet/security/bulletin/ms00-007.asp For additional security-related information about Microsoft products, please visit the following Microsoft Web site: http://www.microsoft.com/technet/security/ Additional query words: security_patch kbtsesrp ====================================================================== Keywords : kbenv kbSecurity kbWinNT400PreSP7Fix kbgraphxlinkcritical KbSECBulletin Technology : kbWinNTsearch kbWinNTWsearch kbWinNTW400 kbWinNTW400search kbWinNT400search kbWinNTSsearch kbWinNTS400search kbNTTermServ400 kbNTTermServ400sp4 kbNTTermServ400sp5 kbNTTermServ400sp6 kbNTTermServSearch Version : :4.0,4.0 SP4,4.0 SP5,4.0 SP6 Hardware : ALPHA x86 Issue type : kbbug Solution Type : kbfix ============================================================================= 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. Copyright Microsoft Corporation 2002.