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Internet Message Access Protocol (IMAP) Supports advanced e-mail exchange facilities between mail clients and mail servers. Like FTP, IMAP has buffer-overflow issues, which have previously allowed remote users to execute privileged commands arbitrarily on the mail server. Network File System (NFS) service Shares disk partitions to remote client systems. NFS service is often misconfigured to provide world read access to all shared volumes, when this access should be granted only to specific users. Network Information Service (NIS) A distributed network service that shares maps of users, groups, and passwords between hosts to minimize administrative overheads. NIS can be compromised if a rogue user can detect the NIS service operating. Sendmail Mail Transport Agent (MTA) Once allowed Solaris commands to be embedded within e-mails, which were executed without authentication on the server side. SAINT works by systematically scanning ports for services that have well-known exploits, and then reporting these exploits back to the user. In addition, it runs a large number of password checks for default passwords on system accounts, or accounts that often have no passwords. SAINT checks all the services and exploits that it knows about, and the database of known exploits grows with each new release. SAINT also tests the susceptibility of your system to DoS attacks, where a large number of large-sized packets are directed to a specific port on your system. This tactic is typically used against Web servers, where some high-profile cases in recent years have highlighted the inherent weakness of networked systems that allow traffic on specific ports without some kind of regulation. Many of the system daemons checked by SAINT have a so-called buffer overflow problem, where a system may be crashed because memory is overwritten with arbitrary values outside the declared size of an array. Without appropriate bounds checking, passing a GET request to a Web server of 1025 bytes when the array size is 1024 would clearly result in unpredictable behavior, because the C language does not prevent a program from doing this. Because Solaris daemons are typically written in C, a number of them have been fixed in recent years to prevent this problem from occurring (but you may be surprised at just how often new weaknesses are exposed). You can download the latest release of SAINT from the SAINT corporation web site. To run SAINT, you need to install the GNU C compiler or use the Sun C compiler. The Perl interpreter and Netscape Web browser supplied with Solaris 10 are also required. After using make to build the SAINT binary, you can start SAINT by typing this command:
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This starts up the Netscape Web browser. SAINT has several pages, including Data Management, Target Selection, Data Analysis, and Configuration Management. You can visit these pages sequentially to conduct your audit. The Data Management page, shown in Figure 9-6, allows you to create a new
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SAINT database in which to store the results of your current audit. You can also open an existing SAINT database if you have created one previously, and/or you can merge data from other SAINT scans. Next, you need to use the Target Selection page to identify the host system that you wish to scan using SAINT, as shown in Figure 9-7. Here, you need to enter the FQDN of the host that you wish to scan. If you have a large number of hosts to scan, it may be more useful to create a file containing a list of hosts. This file could then be used by a system behind the firewall to identify locally visible weaknesses, and used by a system external to the firewall to reveal any threats visible to the outside world. You may also elect to scan all hosts in the LAN, which should be performed only after hours, because it places a heavy load on network bandwidth.
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