SMB share full access by Everyone group
| nt-netbios-everyoneaccess (1) |  Low Risk |
Description:
An SMB share has been detected with no access control. This misconfiguration can allow access to the entire hard drive on unpatched versions of Windows 95 and Windows NT.
In Windows NT, it is common to find shares with all access enabled, since this is the default when the share is created. It is best to explicitly set the access control list on shares. If this vulnerability was detected on a version of Windows NT prior to Service Pack 3 (SP3), an attacker can use shares to cause the system to crash.
*CVSS:
| Base Score: | 7.5 |
| Access Vector: | Network |
| Access Complexity: | Low |
| Authentication: | None |
| Confidentiality Impact: | Partial |
| Integrity Impact: | Partial |
| Availability Impact: | Partial |
| Temporal Score: | 6.5 |
| Exploitability: | High |
| Remediation Level: | Official-Fix |
| Report Confidence: | Confirmed |
Consequences:
Obtain Information
Remedy:
Set the permissions explicitly or remove the share.
Grant share access only to approved users.
- From the local computer, open Windows NT Explorer.
- Navigate to the shared folder.
- Right-click the shared folder name and select Sharing to display the Properties dialog box.
- Click Permissions.
Use these guidelines to review the listed permissions:
- Remove or change any permissions such as Everyone - Full Control. This default permission allows all users to read, modify, and even change ownership and permissions on the items in the share.
- Review any names with Change or Full Control permissions and determine if the permission is appropriate. Consider using Read Only or No Access if these names do not need to modify items in the share.
- Review any names that should not be in the list, and remove the name or change their permission as appropriate.
- From the local computer, open Windows NT Explorer.
- Navigate to the shared folder.
- Right-click the shared folder name and select Sharing to display the Properties dialog box.
- To disallow access to all users, select the Not Shared check box.
- From a remote computer, open the Server Manager.
- Select the host name.
- From the Computer menu, select Shared Directories to display the Shared Directories dialog box.
- Select the SMB share.
- Choose Stop Sharing.
- Start Computer Management Console (compmgmt.msc) from a command prompt. The focus is local computer by default.
- To remove a share from a local computer, skip to the next step.
- To remove a share from a remote computer, right-click the Computer Management node and select Connect to another computer, then enter the name of the remote computer where the share will be removed.
- Double-click the Shared Folders node.
- Single-click the Shares folder.
- Right-click on the shared folder of interest, and select stop sharing.
- Confirm the operation.
- CERT Advisory CA-2003-08: Increased Activity Targeting Windows Shares.
- CIAC Information Bulletin N-053: Increased Activity Targeting Microsoft Windows Shares.
- Microsoft Knowledge Base Article 128079: Updated Drivers for File and Printer Sharing Security.
- CVE-1999-0519: A NETBIOS/SMB share password is the default, null, or missing.
- Microsoft Windows 2000
- Microsoft Windows 2003 Server
- Microsoft Windows 7
- Microsoft Windows 8
- Microsoft Windows 95
- Microsoft Windows 98
- Microsoft Windows 98SE
- Microsoft Windows Me
- Microsoft Windows NT 4.0
- Microsoft Windows Server 2008 R2
- Microsoft Windows Server 2008
- Microsoft Windows Server 2012
- Microsoft Windows Vista
- Microsoft Windows XP x64
- Microsoft Windows XP
— OR —
Windows: To remove a share, choose one of these options:
Remove the share from a local computer:
Remove the share from a remote computer:
Remove the share from the command line:
From a command prompt, type: net share sharename /delete
Other Operating Systems: Enable some form of access control as described in your OS documentation.
In Windows 2000, to remove a share from a local or remote computer:
You may also remove a share from the command line by typing the following at a command prompt:
net share sharename /delete
References:
Platforms Affected:
Reported:
Jan 01, 1997
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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.