Title: Microsoft Windows 2000 Unauthorized Password Change Vulnerability
Severity: MODERATE
Description:
'NetUserChangePassword' is a security function used in a Windows 2000 network environment. By default the Active Control List only allows administrators and account operators to call this function. The 'NetuserChangePassword' function is invoked when an authorized user attempts to change a network password.
Due to a flaw in Windows 2000's implementation of the 'NetuserChangePassword' function, it is possible for a normal user to change network passwords. Attempting to change the domain password of any user via the Windows Security interface (Windows Security interface appears when using Ctrl-Alt-Del), can be achieved via password guessing or brute force techniques.
Depending on network security settings, after a number of change password failures the account could lock up.
This account lock up security feature could be invoked specifically, when a user fails to specify the correct old password.
Successful exploitation of this vulnerability could lead to a denial of service for the victim user, and possibly lead to a complete compromise of the host.
Affected Products:
- Avaya DefinityOne Media Servers
- Avaya IP600 Media Servers
- Avaya S3400 Message Application Server
- Avaya S8100 Media Servers
- Microsoft Windows 2000 Advanced Server
- Microsoft Windows 2000 Advanced Server SP1
- Microsoft Windows 2000 Advanced Server SP2
- Microsoft Windows 2000 Datacenter Server
- Microsoft Windows 2000 Datacenter Server SP1
- Microsoft Windows 2000 Datacenter Server SP2
- Microsoft Windows 2000 Professional
- Microsoft Windows 2000 Professional SP1
- Microsoft Windows 2000 Professional SP2
- Microsoft Windows 2000 Server
- Microsoft Windows 2000 Server SP1
- Microsoft Windows 2000 Server SP2
- Microsoft Windows 2000 Terminal Services
- Microsoft Windows 2000 Terminal Services SP1
- Microsoft Windows 2000 Terminal Services SP2
References:
- Alberto Aragones <quimeras@QUIMERAS.COM>: Changing NT/2000 accounts password from the command line
- Russ <Russ.Cooper@RC.ON.CA>: Re: Changing NT/2000 accounts password from the command line
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