DOCUMENT:Q267861 15-MAY-2002 [winnt] TITLE :MS00-095: RAS Registry Modification Allowed Without Administrati PRODUCT :Microsoft Windows NT PROD/VER::4.0,4.0 SP1,4.0 SP2,4.0 SP3,4.0 SP4,4.0 SP5,4.0 SP6a OPER/SYS: KEYWORDS:kbSecurity MSGRAPH kbWinNT400PreSP7Fix kbgraphxlinkcritical KbSECVulnerability KbSECBul ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Server versions 4.0, 4.0 SP1, 4.0 SP2, 4.0 SP3, 4.0 SP4, 4.0 SP5, 4.0 SP6a - Microsoft Windows NT Server, Enterprise Edition versions 4.0, 4.0 SP4, 4.0 SP5, 4.0 SP6a - Microsoft Windows NT Workstation versions 4.0, 4.0 SP1, 4.0 SP2, 4.0 SP3, 4.0 SP4, 4.0 SP5, 4.0 SP6a ------------------------------------------------------------------------------- SYMPTOMS ======== Microsoft has released a tool that corrects the permissions on several registry values in Microsoft Windows NT 4.0. The default permissions could allow a malicious user to gain additional privileges on an affected machine. The "RAS Administration" key, HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\RAS, provides a way to install third-party RAS products that work with the Windows NT native RAS service. By changing one of the values in this key, it would be possible for a malicious user to specify code of her choice as a third-party management tool. The code would then run in the LocalSystem security context. Although it might be possible to make the needed registry changes remotely, the malicious user's code would need to reside on the affected computer itself. RAS is not installed on Windows NT 4.0 machines by default. For additional information about other registry keys affected by this tool, click the article numbers below to view the articles in the Microsoft Knowledge Base: Q265714 Windows NT 4.0 SNMP Registry Entries Are Readable Q267864 MTS Package Administration Key Includes Information About Users For additional information about this vulnerability, see the following Microsoft Web site: http://www.microsoft.com/technet/security/bulletin/MS00-095.asp RESOLUTION ========== 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 file is available for download from the Microsoft Download Center: DownloadDownload Q265714i.exe now (http://www.microsoft.com/downloads/release.asp?ReleaseID=24501) 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. NOTE: Due to file dependencies, this patch requires Windows NT 4.0 Service Pack 5 or later. The English version of this fix should have the following file attributes or later: Date Time Size File name Platform --------------------------------------------------- 06/23/2000 08:28p 42,256 Regacl40.exe Intel 06/23/2000 08:28p 161,040 Tcpcfg.dll Intel 06/23/2000 08:27p 96,016 Regacl40.exe Alpha 06/23/2000 08:26p 242,960 Tcpcfg.dll Alpha STATUS ====== Microsoft has confirmed that this problem could result in some degree of security vulnerability in Windows NT 4.0. Additional query words: security_patch ====================================================================== Keywords : kbSecurity MSGRAPH kbWinNT400PreSP7Fix kbgraphxlinkcritical KbSECVulnerability KbSECBulletin Technology : kbWinNTsearch kbWinNTWsearch kbWinNTW400 kbWinNTW400search kbWinNT400search kbWinNTW400sp5 kbWinNTW400sp4 kbWinNTW400sp3 kbWinNTW400sp2 kbWinNTW400sp1 kbWinNTSsearch kbWinNTSEntSearch kbWinNTSEnt400sp5 kbWinNTSEnt400sp4 kbWinNTSEnt400 kbWinNTS400sp6 kbWinNTS400sp5 kbWinNTS400sp4 kbWinNTS400sp3 kbWinNTS400sp2 kbWinNTS400sp1 kbWinNTS400search kbWinNTS400 kbWinNTSEnt400SP6a kbWinNTW400SP6a Version : :4.0,4.0 SP1,4.0 SP2,4.0 SP3,4.0 SP4,4.0 SP5,4.0 SP6a 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. 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