Title: Microsoft W2K Telnet Various Domain User Account Access Vulnerability
Severity: HIGH
Description:
Microsoft Windows 2000 contains a flaw in the handling of telnet domain authentication.
If a user attempts to authenticate using a valid login name appended with specially chosen characters, the telnet service will not require the user to specify the domain which the account belongs. The service will instead search the domain and all trusted domains for the user account, if the account is enabled the user will have to complete authentication.
Once an attacker is aware of a valid user account, brute force techniques can be used to attempt access into the trusted domain.
Successful exploitation of this vulnerability will disclose environment information and username existance, both pieces of information could assist in further attacks against 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
References:
- Microsoft: Microsoft Security Bulletin MS01-031
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