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C:\>sid2user \\192168233 5 21 8915387 1645822062 18198280005 500 Name is godzilla Domain is ACME Type of SID is SidTypeUser

Most NDS trees can be browsed almost down to the end leaf by using Novell s On-Site Admin product In this case, Client32 does actually attach to the server selected within the tree (see the previous illustration) The reason is that by default, NetWare 4x allows anyone to browse the tree You can minimize this by adding an inheritance rights filter (IRF) to the root of the tree Tree information is incredibly sensitive you don t want anyone casually browsing this stuff Some of the more sensitive information that can be gathered is shown in Figure 3-11 users, groups, servers, volumes the whole enchilada! Using the information presented here, an attacker can then turn to active system penetration, as we describe in 7

Note that S-1 and the hyphens are omitted Another interesting factoid is that the first account created on any NT-based local system or domain is assigned an RID of 1000, and each subsequent object gets the next sequential number after that (1001, 1002, 1003, and so on RIDs are not reused on the current installation) Therefore, once the SID is known, a hacker can basically enumerate every user and group on an NT Family system, past and present sid2user/user2sid will even work if RestrictAnonymous is set to 1 (defined shortly), as long as port 139 or 445 is accessible

Figure 3-11

3:

Most modern UNIX implementations rely on standard TCP/IP networking features and are thus not as prone to giving up information as freely as NT does via its legacy NetBIOS interfaces or as NetWare does over its proprietary mechanisms Of course, this does not mean that UNIX isn t vulnerable to enumeration techniques, but just what techniques will yield the most results depends on how the system is configured For example, Remote Procedure Call (RPC), Network Information System (NIS), and Network File System (NFS) still enjoy widespread deployment and have all been targeted by attackers over the years We have listed some classic techniques next (read: oldies but goodies that just never seem to get fixed ) Also, keep in mind as you read that most of the techniques here heavily use information gathered from port scans and OS identification techniques outlined in the previous two chapters

Here s a simple example of how to script user2sid/sid2user to loop through all the available user accounts on a system Before running this script, we first determine the SID for the target system using user2sid over a null session, as shown previously Recalling that the NT Family assigns new accounts an RID beginning with 1000, we then execute the following loop using the NT Family shell command FOR and the sid2user tool (see earlier) to enumerate up to 50 accounts on a target:

Popularity: Simplicity: Impact: Risk Rating: 7 10 1 6

The best sources of UNIX network information are the basic TCP/IP techniques discussed in 2 (port scanning, and so on), but one good tool for digging a little deeper is the UNIX utility showmount, useful for enumerating NFS-exported file systems on a network For example, say that a previous scan indicated that port 2049 (NFS) was listening on a potential target Showmount can then be used to see exactly what directories are being shared:

C:\>for /L %i IN (1000,1,1050) DO sid2user \\acmepdc1 5 21 1915163094 1258472701648912389 %I >> userstxt C:\>cat userstxt Name is IUSR_ACMEPDC1 Domain is ACME Type of SID is SidTypeUser Name is MTS Trusted Impersonators Domain is ACME Type of SID is SidTypeAlias

The e switch shows the NFS server s export list Unfortunately, there s not a lot you can do to plug this leak, as this is NFS default behavior Just make sure that your exported file systems have the proper permissions (read/write should be restricted to specific hosts) and that NFS is blocked at the firewall (port 2049) Showmount requests can also be logged, another good way to catch interlopers NFS isn t the only file-system sharing software you ll find on UNIX anymore, thanks to the growing popularity of the open source Samba software suite that provides seamless file and print services to SMB clients SMB (Server Message Block) forms the under-