. mailing list archives RE: Null Session information from NAT.EXE From: 'Zwan-van-der.Erwin' Date: Tue, 21 May 2002 14:38:56 +0200 Try some other null sessions tools first, to get a feel for the system.
Then, if some new info develops, try to exploit that. Did you make a full port scan already? Do you have a glue about services running on your target? Of course the goal is set to go for admin. Try to find an exploit and dump the SAM or sniff something from the wire. Some other command line tools are: Enum Windows NT Command lint tool to enumeration Windows information using null sessions.
Enum can retrieve userlists, machine lists, sharelists, namelists, group and member lists, password and LSA policy information. Enum is also capable of a rudimentary brute force dictionary attack on individual accounts. Exporter Windows NT Command line tool for exporting users, groups, group members, services, computers, shares, disk space, and printers (in any combination) from any or all computers on any Windows NT/Windows 2000 domain. Includes online.HLP documentation file.
Exporter is also integrated into Hyena. GetAcct Windows NT Command line tool to sidestep 'RestrictAnonymous=1' and acquires account information on Windows NT/2000 machines. Input the IP address or NetBIOS name of a target computer in the 'Remote Computer' column. Input the number of 1000 or more in the 'End of RID' column. The RID is user's relative identifier by which the Security Account Manager gives it when the user is created.
Therefore, it is input as 1100, if there are 100 users. Finally push the 'Get Account' button. NBTEnum Windows NT Command line tool for Windows which can be used to enumerate one single host or an entire class C subnet. This utility can run in two modes: query and attack. The main difference between these modes is that when NBTEnum is running in attack mode it will seek for blank password and for passwords that are the same as the username but then in lowercase letters. Changes: Dictionary attack added, now does enumeration of NT version and Service Pack level, AutoAdminLogon detection, WinVNC encrypted password extraction, and Enumeration of NT services.
By NTSleuth NTInfo Windows NT Command line tool to provide the a complete overview of a Windows NT system. This script creates an information file with info on registry, services, drivers, hardware, nbtstat, arp, winmsd, route, ipconfig etc.
Requires several tools from the Resources kit to create the overview. UserInfo Windows NT Command line tool that retrieves all available information about any know user from any NT/Win2k system that you can hit 139 on. Specifically calling the NetUserGetInfo api call at Level 3, UserInfo returns standard info like SID, Primary group, logon restrictions, etc., but it also dumps special group information, pw expiration info, pw age, smartcard requirements, and lots of other stuff. This guy works as a null user, even if the system has RA set to 1 to specifically deny anonymous enumeration. IPC$ Cracker Windows NT Command line tool to attempt to crack a user's password using a dictionary attack by connecting to the IPC$ hidden share on a NT machine and trying passwords read from a text file. NTCrack Windows NT Command line tool to run password dictionary attacks using administrator account to access Windows share or service.
We are trying to disable Null Sessions and Anonymous logons in Server 2008. We have all the registry keys configured the way we are told to yet the Anonymous logon is still enumerating local accounts, groups and the password policy. The following is what we have set: HKEY SYSTEM CurrentControlSet Control Lsa: RestrictAnonymous = 1 Restrict AnonymousSAM = 1 EveryoneIncludesAnonymous = 0 HKLM SYSTEM CurrentControlSet Services LanmanServer Parameters: RestrictNullSessAccess = 1 In the past, these settings worked fine for us and we were not able to get data back. It seems as though in the last month or so, all the sudden these settings are not working for us and we are able to get data back with a Null Session/Anonymous Logon. Does anyone have any idea as to what we might be missing?
Hi Rainforest, There are 6 policies listed below that controls what information can be accessed anonymously. These policies are located in local group policy editor under Computer Configuration Windows Settings SecuritySettings Local Policies SecurityOptions. Network access: Allow anonymous SID/Name translation 2. Network access: Do not allow anonymous enumeration of SAM accounts 3. Network access: Do not allow anonymous enumeration of SAM accounts and shares 4. Network access: Let Everyone permissions apply to anonymous users 5.
Network access: Named Pipes that can be accessed anonymously 6. Network access: Shares that can be accessed anonymously In order to completely disable anonymous logons, you can disable policy 1 and 4, enable policy 2 and 3, and specifying empty lists for policy 5 and 6. Regards, Karen Ji This posting is provided 'AS IS' with no warranties, and confers no rights. Hi Rainforest, There are 6 policies listed below that controls what information can be accessed anonymously. These policies are located in local group policy editor under Computer Configuration Windows Settings SecuritySettings Local Policies SecurityOptions.
Network access: Allow anonymous SID/Name translation 2. Network access: Do not allow anonymous enumeration of SAM accounts 3. Network access: Do not allow anonymous enumeration of SAM accounts and shares 4. Network access: Let Everyone permissions apply to anonymous users 5. Network access: Named Pipes that can be accessed anonymously 6. Network access: Shares that can be accessed anonymously In order to completely disable anonymous logons, you can disable policy 1 and 4, enable policy 2 and 3, and specifying empty lists for policy 5 and 6. Regards, Karen Ji This posting is provided 'AS IS' with no warranties, and confers no rights.
. mailing list archives Null Session From: 'Wbsony' Date: Sun, 6 Mar 2005 23:54:52 +1100 Hi all, Recently, I did some testing on Windows hosts, and found things that confused me. When I ran: c: net use host IPC$ ' /u:administrator The command completed successfully.
It was successful, then I can connect to the registry of that particular host remotely. At first, I thought it was because administrator's password was simply empty password. However, when I ran similar command, with user name that didn't exist in the system, same result occured: c: net use host IPC$ ' /u:blablabla The command completed successfully.
I thought maybe just null session issues, but the null session connection was unsuccessful: net use host IPC$ ' /u:' (Sorry, I forgot the actual results shown, some kind of 'error occured' message). Anybody encountered this situation before and could enlighten me?
Thanks in advance, Wbsony Current thread:. Null Session Wbsony (Mar 07).
H D Moore (Mar 07). Isidro Labrador (Mar 08). Joachim Schipper (Mar 08). Javier Fernandez-Sanguino (Mar 09).
Olivier Fauchon (Mar 09). Michel Arboi (Mar 10). Michel Arboi (Mar 10).
Creating Null Session Shares 1. NSS for RIS clients When network installing Microsoft RIS OSs (Windows 2000, Windows XP, Windows Server 2003) it is necessary the creation of a 'Null Session Share' (NSS). This kind of share got some bad reputation in the past from a security point of view, therefore setting them up on modern OSs it's not just a straight forward single-step action; it involves a bit of effort.
This section tries to help Serva users creating their NSSs on different host platforms. Select your host OS. Enabling File Sharing:. Click Start/Settings/ Network and Dial-up Connections. Right click the 'Local Area Connection' icon. Click Install/Service.
Click Add. Select 'File and Printer Sharing for Microsoft Networks'. Re-boot.
Enabling the Guest Account:. Start/Settings/ Control Panel. Open 'Users and Passwords' and click the 'Advanced' Tab. In the 'Advanced User Management' section click 'Advanced'. Open the 'Users' folder and click the 'Guest' user. Un-check 'Account is disabled' and click OK.
Close the 'Local Users and Groups' dialog and click OK. Creating the Share:. From File Explorer right click the TFTP root directory and select 'Sharing.' . Select 'Share this folder'. Click 'New Share'.
Add 'Share Name' = WIARISSHARE and click OK. Select any 'Share Name' different than WIARISSHAREfrom the combo-box and click Remove Share. Verify 'Share Name' = WIARISSHARE and click Permissions. Remove all users/groups then add the user 'Guest' with 'Read' rights only. Enabling Simple File Sharing (Windows XP Professional):.
Start/ Control Panel, click 'Switch to Classic View' and then the 'Folder Options' icon. Select the 'View' tab. Under the 'Advanced settings' section select the 'File and Folders/ Use simple file sharing (Recommended)' check box. Click OK to close the 'Folder Options' dialog box. Creating the Share:. From File Explorer right click the TFTP root directory and select 'Sharing and Security.' .
If remote access is disabled:. Under the 'Network sharing and security' section click 'If you understand the security risks but want to share files without running the wizard, click here.' . In the next 'Enable File Sharing' dialog box, select the 'Just enable file sharing' radio button, and then click OK. Check 'Share this folder on the network' with 'Share Name' = WIARISSHARE. Click OK to close the Properties dialog box.
Click Yes (share anyway) to the warning about share names longer than 12 characters. Open the Control Panel and then select 'Administrative Tools' and then 'Services'.
Next Right-click the ' Server' service and select Restart to restart the service. Enabling the Guest Account:. Run lusrmgr.msc (Local Users and Groups). Open the 'Users' folder and click the 'Guest' user. Un-check 'Account is disabled' and click OK. Close lusrmgr.msc (Local Users and Groups). Creating the Share:.
From File Explorer right click the TFTP root directory and select 'Properties.' .
Select the 'Sharing' tab. Check 'Share this folder', set 'Share Name' = WIARISSHARE and click Permissions. Remove all users/groups then add the user 'Guest' with 'Read' rights only and click OK. Back at the Properties dialog now select the 'Security' tab. Click Add., enter the user 'Guest' and click OK.
Selecting the user 'Guest' at the 'Group or user names:' pane edit its permissions at the 'Permissions for Guest' pane. Make sure you check the 'Allow' column with 'Read & execute', 'List folder contents' and, 'Read' permissions, then click OK. Enabling Anonymous Logon:. Open the Control Panel and navigate to: Network and Internet Network and Sharing Center Sharing and Discovery Turn off: password protected sharing. Save changes and close the Control Panel. Creating the Share:. From File Explorer right click the TFTP root directory and select 'Properties.'
. Select the 'Sharing' tab and click Advanced Sharing. Check 'Share this folder', set 'Share Name' = WIARISSHARE and click Permissions. Remove all users/groups then add the user 'Guest' with 'Read' rights only. Enabling Anonymous Logon: 1.
Run the Control Panel 2. Navigate to: Network and Internet Network and Sharing Center Change advanced sharing settings Select: Turn off password protected sharing 3. Save changes and close the Control Panel. Creating the Share:.
From File Explorer right click the TFTP root directory and select 'Properties.' . Select the 'Sharing' tab and click Advanced Sharing. Check 'Share this folder', set 'Share Name' = WIARISSHARE and click Permissions.
Remove all users/groups then add the user 'Guest' with 'Read' rights only and click OK twice. Back at the Properties dialog now select the 'Security' tab and click Edit.
Click Add., enter the user 'Guest' and click OK. Selecting the user 'Guest' at the 'Group or user names:' pane edit its permissions at the 'Permissions for Guest' pane.
Establish A Null Session
Make sure you check the 'Allow' column with 'Read & execute', 'List folder contents' and, 'Read' permissions, then click OK and Close. Enabling Anonymous Logon: 1. Run the Control Panel 2. Navigate to: Network and Internet Network and Sharing Center Change advanced sharing settings Select: Turn off password protected sharing 3. Save changes and close the Control Panel. Creating the Share:.
From File Explorer right click the TFTP root directory and select 'Properties.' . Select the 'Sharing' tab and click Advanced Sharing. Check 'Share this folder', set 'Share Name' = WIARISSHARE and click Permissions. Remove all users/groups then add the user 'Guest' with 'Read' rights only and click OK twice.
Back at the Properties dialog now select the 'Security' tab and click Edit. Click Add., enter the user 'Guest' and click OK. Selecting the user 'Guest' at the 'Group or user names:' pane edit its permissions at the 'Permissions for Guest' pane.
Make sure you check the 'Allow' column with 'Read & execute', 'List folder contents' and, 'Read' permissions, then click OK twice. Enabling Anonymous Logon: 1. Run the Control Panel 2.
Navigate to: Network and Internet Network and Sharing Center Change advanced sharing settings Select: Turn off password protected sharing 3. Save changes and close the Control Panel.
Creating the Share:. From File Explorer right click the TFTP root directory and select 'Properties.' . Select the 'Sharing' tab and click Advanced Sharing. Check 'Share this folder', set 'Share Name' = WIARISSHARE and click Permissions. Remove all users/groups then add the user 'Guest' with 'Read' rights only and click OK twice.
Back at the Properties dialog now select the 'Security' tab and click Edit. Click Add., enter the user 'Guest' and click OK. Selecting the user 'Guest' at the 'Group or user names:' pane edit its permissions at the 'Permissions for Guest' pane. Quotes anna robertson brown. Make sure you check the 'Allow' column with 'Read & execute', 'List folder contents' and, 'Read' permissions, then click OK and Close. Enabling Anonymous Logon: 1.
Click Win-Logo+X run the Control Panel 2. Navigate to: Network and Internet Network and Sharing Center Change advanced sharing settings Select: Turn off password protected sharing 3. Save changes and close the Control Panel.
Creating the Share:. From the Metro UI click on Desktop. From File Explorer right click the TFTP root directory and select 'Properties.' .
Select the 'Sharing' tab and click Advanced Sharing. Check 'Share this folder', set 'Share Name' = WIARISSHARE and click Permissions. Remove all users/groups then add the user 'Guest' with 'Read' rights only.
Enabling Anonymous Logon: 1. Search and run the Control Panel 2. Navigate to: Network and Internet Network and Sharing Center Change advanced sharing settings Select: Turn off password protected sharing 3.
Save changes and close the Control Panel. Creating the Share:.
From File Explorer right click the TFTP root directory and select 'Properties.' . Select the 'Sharing' tab and click Advanced Sharing. Check 'Share this folder', set 'Share Name' = WIARISSHARE and click Permissions.
Remove all users/groups then add the user 'Guest' with 'Read' rights only. NSS for older clients The SMB (Server Message Block) Protocol used by Microsoft shares supports dialect negotiation. A dialect is a version of the Protocol that is generally defined in terms of additions and changes relative to a previous version. RIS clients when requiring the services of the NSS are able to negotiate a dialect called 'CIFS' (also known as “NT LAN Manager” or, simply “NT LANMAN”) which is identified by the dialect string 'NT LM 0.12'.
The instructions for creating an NSS included in the previous section, consider all RIS clients are by default able to use the 'NT LM 0.12' dialect against any host running Windows 2000 and up. In the case you need to create an NSS for a client ( other than RIS) that mandatorily requires older dialects like “LANMAN1.0”, “LANMAN1.2”, etc, then you might need extra steps in order to enable those old dialects in your host; i.e. Run the program ' Regedit'.
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Navigate to: HKEYLOCALMACHINE SYSTEM CurrentControlSet Services lanmanserver parameters Edit the multi-string (REGMULTISZ) value ' NullSessionShares' and add the share name on a new line. Navigate to: HKEYLOCALMACHINE SYSTEM CurrentControlSet Control LSA Edit the 32-bit value (REGDWORD) value ' restrictanonymous' and set it to 0. NOTE 1: These additional steps are not required if you are just trying to install a RIS OS with Serva. NOTE 2: Some of the described procedures involve registry editing and other administrative tasks.
However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs.
Confirmed errors or comments on how to improve the information contained in this document please contact us. Updated Originally published.