what you don't know can hurt you


Posted Oct 23, 1997


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From xforce@ISS.NET Thu Oct 23 11:41:17 1997
Date: Wed, 22 Oct 1997 17:22:31 -0400
From: X-Force <xforce@ISS.NET>
Subject: ISS Security Alert


ISS Security Alert
October 21, 1997
Scheduler/Winlogin Keys have Incorrect Permissions

This advisory describes two similar configuration problems in the Windows
NT Registry key permissions. These vulnerabilities can allow users with
Server Operator privilege to increase their access level to Administrator.

Problem 1: Scheduler Key Has Incorrect Permissions

Affects: Windows NT

The HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Schedule key
controls the schedule service. Server Operators have permission to write
to this registry tree, which would allow them to manually schedule jobs
to be run by the schedule service, which normally executes under the
system user context. This can be used to raise the Server Operator's
access level to Administrator.

Risk: Medium

Local Machine (GUI): From the Start menu, choose 'Run.' Type 'regedt32'
and click 'OK.' This opens the Registry Editor. Through the Security
menu, remove write access to the Schedule key for Server Operators.

Problem 2: Winlogon Key Has Incorrect Permissions

Affects: Windows NT

The HKEY_LOCAL_MACHINE\Software\Microsoft\WindowsNT\CurrentVersion\Winlogon
key has two values which can be used to cause a process to execute upon
either system bootup, or when a user logs on. The programs pointed to by
the System value run under the system user context after boot, and could
be used to change a user's rights or access level. The UserInit value
runs applications when a user logs in. The default settings for this key
allow Server Operators to write these values, either of which could be
used to raise a System Operator's access level to Administrator.

Risk: Medium

Local Machine (GUI): From the Start menu, choose 'Run.' Type 'regedt32'
and click 'OK.' This opens the Registry Editor. Through the Security
menu, remove write access to the Winlogon key for Server Operators.

Caution: Care must be taken when using the Registry Editor. If incorrect
values are entered, the system may become inoperable. Should a mistake be
made when editing the registry values, the registry state can be restored
to the state at the last time the system booted up. For more information,
see the Windows NT Help under the "Registry" section.

This problem was identified by David LeBlanc of ISS (dleblanc@iss.net).


X-Force Vulnerability and Threat Database: http://www.iss.net/xforce

To receive these Alert Summaries, subscribe to the ISS Alert mailing list
by sending an email to majordomo@iss.net and within the body of the
message type: 'subscribe alert'.

Internet Security Systems, Inc., (ISS) is the pioneer and world's leading
supplier of network security assessment and monitoring tools, providing
comprehensive software that enables organizations to proactively manage
and minimize their network security risks. For more information, contact
the company at (800) 776-2362 or (770) 395-0150 or visit the ISS Web site
at http://www.iss.net.

- --------
Copyright (c) 1997 by Internet Security Systems, Inc.

Permission is hereby granted for the redistribution of this Alert Summary
electronically. It is not to be edited in any way without express consent
of X-Force. If you wish to reprint the whole or any part of this
Alert Summary in any other medium excluding electronic medium, please
email xforce@iss.net for permission.


The information within this paper may change without notice. Use of this
information constitutes acceptance for use in an AS IS condition. There
are NO warranties with regard to this information. In no event shall the
author be liable for any damages whatsoever arising out of or in
connection with the use or spread of this information. Any use of this
information is at the user's own risk.

X-Force PGP Key available at: http://www.iss.net/xforce/sensitive.html

Please send suggestions, updates, and comments to:
X Force <xforce@iss.net> of Internet Security Systems, Inc.

Version: 2.6.2

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