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rusers returns similar output with a little more information by using the l switch, including the amount of time since the user has typed at the keyboard This information is provided by the rpcrusersd Remote Procedure Call (RPC) program if it is running As
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Enumeration
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discussed earlier in this chapter, RPC portmappers typically run on TCP/UDP 111 and TCP/UDP 32771 on some Sun boxes Here s an example of the rusers client enumerating logged-on users on a UNIX system:
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[root$] rusers l 19216820234 root 19216820234:tty1 root 19216820234:ttyp0
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rwho and rusers Countermeasures
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Like finger, these services should just be turned off They are generally started independently of the inetd superserver, so you ll have to look for references to rpc rwhod and rpcrusersd in startup scripts (usually located in /etc/initd and /etc/rc*d) where stand-alone services are initiated Simply comment out the relevant lines using the # character
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NIS Enumeration, RPC Program 100004
Popularity: Simplicity: Impact: Risk Rating: 3 8 1 4
Another potential source of UNIX network information is Network Information System (NIS), a great illustration of a good idea (a distributed database of network information) implemented with poorly thought out to nonexistent security features Here s the main problem with NIS: Once you know the NIS domain name of a server, you can get any of its NIS maps by using a simple RPC query The NIS maps are the distributed mappings of each domain host s critical information, such as passwd file contents A traditional NIS attack involves using NIS client tools to try to guess the domain name Or a tool such as pscan, written by Pluvius and available from many Internet hacker archives, can ferret out the relevant information using the n argument
NIS Countermeasures
The take-home point for folks still using NIS is, don t use an easily guessed string for your domain name (company name, DNS name, and so on) This makes it easy for hackers to retrieve information, including password databases If you re not willing to migrate to NIS+ (which has support for data encryption and authentication over secure RPC), then at least edit the /var/yp/securenets file to restrict access to defined hosts/networks or compile ypserv with optional support for TCP Wrappers Also, don t include root and other system account information in NIS tables
Hacking Exposed 6: Network Security Secrets & Solutions
SQL Resolution Service Enumeration, UDP 1434
Popularity: Simplicity: Impact: Risk Rating: 5 8 2 5
Microsoft SQL Server has traditionally listened for client connections on TCP port 1433 Beginning with SQL Server 2000, Microsoft introduced the ability to host multiple instances of SQL Server on the same physical computer (think of an instance as a distinct virtual SQL Server) Problem is, according to the rules of TCP/IP, port 1433 can only serve as the default SQL port for one of the instances on a given machine; the rest have to be assigned a different TCP port The SQL Server Resolution Service identifies which instances are listening on which ports for remote clients think of it as analogous to the RPC portmapper, kind of a SQL instance mapper The SQL Server Resolution Service always listens on UDP 1434 in SQL Server 2000 and above Chip Andrews of sqlsecuritycom released a Windows-based tool called SQLPing (http://sqlsecuritycom/Tools/FreeTools/tabid/65/Defaultaspx) that queries UDP 1434 and returns instances listening on a given machine, as shown in Figure 3-17 SQLPing also has a good set of complementary functionality such as IP range scanning and brute-force password guessing which allows an attacker to churn merrily through poorly configured SQL environments
SQL Instance Enumeration Countermeasures
Chip Andrews s site at wwwsqlsecuritycom lists several steps you can take to hide your servers from tools such as SQLPing The first is the standard recommendation to restrict access to the service using a firewall More harsh is Chip s alternative recommendation to remove all network communication libraries using the Server Network Utility this will render your SQL Server deaf, dumb, and mute unless you specify (local) or a period (), in which case only local connections will be possible Finally, you can use the hide server option under the TCP/IP netlib in the Server Network Utility and remove all other netlibs Chip claims to have experienced erratic shifts of the default TCP port to 2433 when performing this step, so be forewarned
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