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- #
- # This script was written by Renaud Deraison <deraison@cvs.nessus.org>
- #
- # See the Nessus Scripts License for details
- #
- # Pluto 26.6.00: rcvd_line -> rcvd
- #
- #T
-
- if(description)
- {
- script_id(10068);
- script_version ("$Revision: 1.24 $");
- script_cve_id("CVE-1999-0612");
- name["english"] = "Finger";
- script_name(english:name["english"]);
-
- desc["english"] = "
- The remote host is running the 'finger' service.
-
- The purpose of this service is to show who is currently logged
- into the remote system, and to give information about the users
- of the remote system.
-
- It provides useful information to attackers, since it allows them
- to gain usernames, determine how used a machine is, and see when
- each user logged in for the last time.
-
-
- Solution :
- Comment out the 'finger' line in /etc/inetd.conf and restart
- the inetd process
-
- Risk factor : Low";
-
- script_description(english:desc["english"]);
-
- summary["english"] = "Checks for finger";
-
- script_summary(english:summary["english"]);
-
- script_category(ACT_GATHER_INFO);
-
-
- script_copyright(english:"This script is Copyright (C) 1999 Renaud Deraison");
- family["english"] = "Useless services";
- script_family(english:family["english"]);
- script_dependencie("find_service.nes");
- script_require_ports("Services/finger", 79);
- exit(0);
- }
-
- #
- # The script code starts here
- #
-
- port = get_kb_item("Services/finger");
- if(!port)port = 79;
- if(get_port_state(port))
- {
- soc = open_sock_tcp(port);
- if(soc)
- {
- buf = string("root\r\n");
- send(socket:soc, data:buf);
- data = recv(socket:soc, length:65535);
- if(egrep(pattern:".*User|[lL]ogin|logged.*", string:data))
- {
- report = "
- The 'finger' service provides useful information to attackers, since it allows
- them to gain usernames, check if a machine is being used, and so on...
-
- Here is the output we obtained for 'root' : " + string("\n\n", data, "\n\n") +
-
- "Solution : comment out the 'finger' line in /etc/inetd.conf
- Risk factor : Low";
-
- security_warning(port:port, data:report);
- set_kb_item(name:"finger/active", value:TRUE);
- }
- close(soc);
- }
- }
-