Microsoft KB Archive/128079

Updated Drivers for File and Printer Sharing Security

Q128079

The information in this article applies to:

Microsoft Windows 95

SYMPTOMS

When you use "File and printer sharing for Microsoft Networks" or "File and printer sharing for NetWare Networks" on a Windows 95-based computer, remote users may be able to gain access to your entire hard disk.

When you share a folder on a Windows 95-based computer, users on UNIX- based computers running the SMBCLIENT Samba network client who connect to the shared folder may be able to gain access to the entire drive on which the shared folder is located.

CAUSE

You may experience this problem with "File and printer sharing for NetWare Networks" or with "File and printer sharing for Microsoft Networks" when the following conditions are met.

File and Printer Sharing for NetWare Networks (Nwserver.vxd):

Your workstation is configured to share files and printers with "File and printer sharing for NetWare Networks."
Remote administration or the Microsoft Remote Registry service is enabled.

NOTE: These options are not enabled by default.

File and Printer Sharing for Microsoft Networks (Vserver.vxd):

Your workstation is configured to share files and printers with "File and printer sharing for Microsoft Networks."
Your workstation connects to a LAN, Internet (SLIP or PPP account), or Dial-Up Networking connection that can be accessed by UNIX-based computers running the SMBCLIENT Samba network client.
The network administrator does not disable peer services using System Policies.

The SMBCLIENT Samba network client allows users to send illegal networking commands over the network. At this time, the Samba client is the only known SMBCLIENT that does not filter out such illegal commands. SMBCLIENT users do not automatically gain access to the Windows 95 drive; these users must know the exact steps to send these illegal commands.

RESOLUTION

To prevent these illegal commands from being run on a Windows 95 computer, Microsoft has released new versions of the Nwserver.vxd (4.00.951) and Vserver.vxd (4.00.952) files. These files are available in the Microsoft Windows 95 Service Pack 1 Update Setup.exe file.

For information about Microsoft Windows 95 Service Pack 1, please see the following article in the Microsoft Knowledge Base:

Q142794 Availability of Microsoft Windows 95 Service Pack 1

Installation

To install this update, follow these steps:

Download the Setup.exe file from the Microsoft Download Center to an empty folder.
In My Computer or Windows Explorer, double-click the Setup.exe file you downloaded in step 1.
Follow the instructions on the screen.

The following file is available for download from the Microsoft Download Center:

Download Setup.exe now]

For additional information about how to download Microsoft Support files, click the article number below to view the article in the Microsoft Knowledge Base:

Q119591 How to Obtain Microsoft Support Files from Online Services

Microsoft used the most current virus detection software available on the date of posting to scan this file for viruses. Once posted, the file is housed on secure servers that prevent any unauthorized changes to the file.

MORE INFORMATION

This problem is resolved in Microsoft Windows 98.

For additional information about Windows 95 updates, please see the following article in the Microsoft Knowledge Base:

Q161020 Implementing Windows 95 Updates

Additional query words: syspol msnWin95misc servicepack1

Keywords : kbenv kbnetwork 3rdpartynet msnets win95 kbgraphxlinkcritical
Issue type :
Technology : kbWin95search kbWin95