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Figure 12-3:<br />

LanGuard<br />

revealing<br />

user information<br />

via<br />

the finger<br />

service.<br />

Chapter 12: Linux<br />

LanGuard also determined that the server is running rlogin and rexec, the<br />

Berkeley Software Distribution (BSD) r-services. Figure 12-3 also shows that<br />

LanGuard confirmed the remote operating system is Red Hat Linux. This<br />

information can be handy when you come across unfamiliar open ports.<br />

Figure 12-4 shows various r-services and other daemons that network administrators<br />

are notorious for leaving running unnecessarily on UNIX-based<br />

operating systems. Notice that LanGuard points out specific vulnerabilities<br />

associated with some of these services, along with a recommendation to use<br />

SSH as an alternative.<br />

231

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