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Microsoft has released a patch that eliminates a security vulnerability in a component that is a part of Windows 2000 Service Pack 2 (SP2). This vulnerability involves a Lightweight Directory Access Protocol (LDAP) function that is only available if the LDAP server has been configured to support secure LDAP over Secure Sockets Layer (SSL) sessions, and whose purpose is to allow users to change the data attributes of directory principals. By design, the function should check the authorizations of the user before completing the request. However, it contains an error that manifests itself only when the directory principal is a domain user and the data attribute is the domain password. When this is the case, the function fails to check the permissions of the requester, with the result that it could be possible for a user to change any other user's domain login password.
An attacker could change another user's password for either of two purposes. To cause a denial of service by preventing the other user from logging on, or to log into the user's account and gain any privileges the user had. Clearly, the most serious case would be one in which the attacker changed a domain administrator's password and logged into the administrator's account.
By design, the function affected can be called by any user who can connect to the LDAP server, including users who connect by using anonymous sessions. As a result, any user who could establish a connection with an affected server could exploit the vulnerability.
To resolve this problem, obtain the latest service pack for Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
260910The English version of this fix should have the following file attributes or later:
(http://support.microsoft.com/kb/260910/EN-US/ )How to Obtain the Latest Windows 2000 Service Pack
Date Time Version Size File name ------------------------------------------------------------------------- 6/13/2001 05:32p 5.0.2195.3738 501,520 Lsasrv.dll(56-bit) 6/21/2001 12:23a 5.0.2195.3737 355,088 Advapi32.dll 6/21/2001 12:19a 5.0.2195.3738 519,440 Instlsa5.dll 6/21/2001 12:23a 5.0.2195.3738 142,608 Kdcsvc.dll 6/13/2001 05:43p 5.0.2195.3738 209,008 Kerberos.dll 5/29/2001 09:26a 5.0.2195.3649 69,456 Ksecdd.sys 6/13/2001 05:32p 5.0.2195.3738 501,520 Lsasrv.dll 6/13/2001 05:32p 5.0.2195.3738 33,552 Lsass.exe 6/21/2001 12:23a 5.0.2195.3758 909,072 Ntdsa.dll 6/21/2001 12:23a 5.0.2195.3762 382,224 Samsrv.dll 5/29/2001 09:53a 5.0.2195.3649 128,784 Scecli.dll 5/30/2001 02:19a 5.0.2195.3649 299,792 Scesrv.dll
Microsoft has confirmed that this problem may cause a degree of security vulnerability in Windows 2000. This problem was first corrected in Windows 2000 Service Pack 3.
For additional information about how to obtain a hotfix for Windows 2000 Datacenter Server, click the article number below to view the article in the Microsoft Knowledge Base:
265173For additional information about how to install multiple hotfixes with only one reboot, click the article number below to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/265173/EN-US/ )The Datacenter Program and Windows 2000 Datacenter Server Product
(http://support.microsoft.com/kb/296861/EN-US/ )Use QChain.exe to Install Multiple Hotfixes with One Reboot
Article ID: 299687 - Last Review: October 23, 2013 - Revision: 3.4
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