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Some enumeration tools and techniques will still extract sensitive data from remote systems even if RestrictAnonymous is set to 1, so don t get overconfident To completely restrict access to CIFS/SMB information on Windows 2000 and later systems, set the Additional Restrictions For Anonymous Connections policy key to the setting shown in the next illustration, No Access Without Explicit Anonymous Permissions (This is equivalent to setting RestrictAnonymous equal to 2 in the Windows 2000 and later Registry)
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Setting RestrictAnonymous equal to 2 prevents the Everyone group from being included in anonymous access tokens It effectively blocks null sessions from being created:
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C:\>net use \\mgmgrand\ipc$ "" /u:"" System error 5 has occurred Access is denied
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Beating RestrictAnonymous=1 Don t get too comfy with RestrictAnonymous The hacking community has discovered that by querying the NetUserGetInfo API call at Level 3, RestrictAnonymous = 1 can be bypassed Both NBTEnum (previously mentioned) and the UserInfo tool (wwwHammerofGodcom/downloadhtml) will enumerate user information over a null session even if RestrictAnonymous is set to 1 (Of course, if RestrictAnonymous is set to 2 on a Windows 2000 or later system, null sessions are not even possible in the first place) Here s UserInfo enumerating the Administrator account on a remote system with RestrictAnonymous = 1:
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C:\>userinfo \\victomcom Administrator UserInfo v15 - thor@HammerofGodcom Querying Controller \\mgmgrand
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USER INFO Username: Full Name: Comment: User Comment: User ID: Primary Grp: Privs: OperatorPrivs:
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Administrator Built-in account for administering the computer/domain 500 513 Admin Privs No explicit OP Privs
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SYSTEM FLAGS (Flag dword is 66049) User's pwd never expires MISC INFO Password age: LastLogon: LastLogoff: Acct Expires: Max Storage: Workstations: UnitsperWeek: Bad pw Count: Num logons: Country code: Code page: Profile: ScriptPath: Homedir drive: Home Dir: PasswordExp:
Mon Apr 09 01:41:34 2008 Mon Apr 23 09:27:42 2008 Thu Jan 01 00:00:00 1970 Never Unlimited 168 0 5 0 0
Logon hours at controller, GMT: Hours12345678901N12345678901M Sunday 111111111111111111111111 Monday 111111111111111111111111 Tuesday 111111111111111111111111 Wednesday 111111111111111111111111 Thursday 111111111111111111111111 Friday 111111111111111111111111 Saturday 111111111111111111111111 Get hammered at HammerofGodcom!
A related tool from HammerofGodcom is UserDump It enumerates the remote system SID and then walks expected RID values to gather all user account names UserDump takes the name of a known user or group and iterates a user-specified number of times through SIDs 1001 and up UserDump will always get RID 500 (Administrator) first Then it begins at RID 1001 plus the maximum number of queries specified (Setting MaxQueries equal to 0 or blank will enumerate SID 500 and 1001 only) Here s an example of UserDump in action:
C:\>userdump \\mgmgrand guest 10 UserDump v111 - thor@HammerofGodcom
Hacking Exposed 6: Network Security Secrets & Solutions
Querying Controller \\mgmgrand USER INFO Username: Full Name: Comment: User Comment: User ID: Primary Grp: Privs: OperatorPrivs:
Administrator Built-in account for administering the computer/domain 500 513 Admin Privs No explicit OP Privs
[snip] LookupAccountSid failed: 1007 does not exist LookupAccountSid failed: 1008 does not exist LookupAccountSid failed: 1009 does not exist Get hammered at HammerofGodcom!
Another tool, GetAcct (wwwsecurityfridaycom/tools/GetAccthtml) from Urity of Security Friday, performs this same technique GetAcct has a graphical interface and can export results to a comma-separated file for later analysis It also does not require the presence of an Administrator or Guest account on the target server GetAcct is shown next obtaining user account information from a system with RestrictAnonymous set to 1
Changes to RestrictAnonymous in Windows XP/Server 2003 and later As we ve noted in Windows 2000, setting RestrictAnonymous = 2 prevents null users from even connecting to the IPC$ share However, this has the deleterious effect of preventing down-level client access and trusted domain enumeration The interface to control anonymous access has been redesigned in Windows XP/Server 2003 and later, however, to break out more granularly the actual options controlled by RestrictAnonymous The most immediate change visible when viewing the Security Policy s Security Options node is that No Access Without Explicit Anonymous Permissions (equivalent to setting RestrictAnonymous equal to 2 in Windows 2000) is gone Under XP/Server 2003 and later, all settings under Security Options have been organized into categories The settings relevant to restricting anonymous access fall under the category with the prefix
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