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Microsoft "Registry Permissions" Vulnerability



Microsoft "Registry Permissions" Vulnerability Privacy and Legal Notice

CIAC INFORMATION BULLETIN

K-029: Microsoft "Registry Permissions" Vulnerability

March 29, 2000 17:00 GMT
PROBLEM:       Vulnerabilities exist in the registry of Windows NT 4.0
               platforms. These vulnerabilities involve three sets of registry
               keys whose default permissions are too permissive. These three
               key sets are not related to each other except by the fact that
               their permissions should be tightened.
PLATFORM:      Microsoft NT 4.0 Workstation, Microsoft NT 4.0 Server,
               Microsoft NT 4.0 Server Enterprise Edition, and Microsoft NT 4.0
               Server Terminal Server Edition.
DAMAGE:        The permissions may allow a malicious user who could
               interactively log onto a target machine to: Cause code to run
               in a local system context, cause code to run the next time
               another user logged onto the same machine, or disable the
               security protection for a previously-reported vulnerability.
SOLUTION:      Apply the patch for appropriate hardware.
               Intel: www.microsoft.com/downloads/release.asp?ReleaseID=19172
               Alpha: ww.microsoft.com/downloads/release.asp?ReleaseID=19173

VULNERABILITY The risk is medium. The intruder needs to already have access ASSESSMENT: to the system. The malicious code that is ran could elevate the users rights to Administrator.
[Start Microsoft Advisory] Microsoft Security Bulletin (MS00-008) Patch Available for "Registry Permissions" Vulnerability Originally Posted: March 09, 2000 Summary Microsoft has released a tool that installs tighter permissions on three sets of registry values in Windows NT 4.0. The default permissions could allow a malicious user to gain additional privileges on a machine that they can interactively log onto. Frequently asked questions regarding this vulnerability can be found at http://www.microsoft.com/technet/security/bulletin/fq00-008.asp. Issue This vulnerability involves three sets of registry keys whose default permissions are too permissive. These permissions could allow a malicious user who could interactively log onto a target machine to: Cause code to run in a local system context. Cause code to run the next time another user logged onto the same machine. Disable the security protection for a previously-reported vulnerability. These three key sets are not related to each other except by the fact that their permissions should be tightened. A tool is available that will reset all of the affected keys to the correct default value. Affected Software Versions Microsoft Windows NT 4.0 Workstation Microsoft Windows NT 4.0 Server Microsoft Windows NT 4.0 Server, Enterprise Edition Microsoft Windows NT 4.0 Server, Terminal Server Edition NOTE: Windows 2000 is not affected by this vulnerability. Patch Availability Intel: http://www.microsoft.com/downloads/release.asp?ReleaseID=19172 Alpha: http://www.microsoft.com/downloads/release.asp?ReleaseID=19173 More Information Please see the following references for more information related to this issue. Microsoft Security Bulletin MS00-008: Frequently Asked Questions, http://www.microsoft.com/technet/security/bulletin/fq00-008.asp. Microsoft Security Bulletin MS99-025, Unauthorized Access to IIS Servers through ODBC Data Access with RDS, http://www.microsoft.com/security/bulletins/ms99-025.asp. Microsoft Knowledge Base (KB) article Q103861, INFO: Choosing the Debugger That the System Will Spawn, http://www.microsoft.com/technet/support/kb.asp?ID=103861. Microsoft Knowledge Base (KB) article Q185590, Guide To Windows NT 4.0 Profiles and Policies (Part 5 of 6), http://www.microsoft.com/technet/support/kb.asp?ID=185590. Microsoft Knowledge Base (KB) article Q184375, Security Implications of RDS 1.5, IIS 3.0 or 4.0, and ODBC, http://www.microsoft.com/technet/support/kb.asp?ID=184375. Microsoft Knowledge Base (KB) article Q184375, HOWTO: Regulate Network Access to the Windows NT Registry, http://www.microsoft.com/technet/support/kb.asp?ID=155363. Microsoft TechNet Security web site, http://www.microsoft.com/technet/security/default.asp. Obtaining Support on this Issue This is a fully supported patch. Information on contacting Microsoft Technical Support is available at http://support.microsoft.com/support/contact/default.asp. Revisions March 09, 2000: Bulletin Created. [End Microsoft Advisory]
CIAC wishes to acknowledge the contributions of Microsoft for the information contained in this bulletin.

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UCRL-MI-119788
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