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- #
- # This script was written by Renaud Deraison <deraison@cvs.nessus.org>
- #
- # See the Nessus Scripts License for details
- #
- #T
-
- if(description)
- {
- script_id(10072);
- script_version ("$Revision: 1.14 $");
- script_cve_id("CAN-1999-0198");
- name["english"] = "Finger dot at host feature";
- script_name(english:name["english"]);
-
- desc["english"] = "
-
- There is a bug in the remote finger service which, when triggered, allows
- a user to force the remote finger daemon to display the list of the accounts
- that have never been used, by issuing the request :
-
- finger .@target
-
- This list will help an attacker to guess the operating system type. It will
- also tell him which accounts have never been used, which will often make him
- focus his attacks on these accounts.
-
- Solution : disable the finger service in /etc/inetd.conf and restart the inetd
- process, or upgrade your finger service.
-
- Risk factor : Medium";
-
-
- script_description(english:desc["english"]);
-
- summary["english"] = "Finger .@host feature";
- summary["francais"] = "Finger .@host feature";
- script_summary(english:summary["english"]);
-
- script_category(ACT_GATHER_INFO);
-
-
- script_copyright(english:"This script is Copyright (C) 1999 Renaud Deraison");
- family["english"] = "Finger abuses";
- 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)
- {
- # Cisco
- data = recv(socket:soc, length:2048, timeout:5);
- if(data)exit(0);
-
- buf = string(".\r\n");
- send(socket:soc, data:buf);
- data = recv(socket:soc, length:65535);
- close(soc);
- if(strlen(data)<100)exit(0);
- data_low = tolower(data);
-
- if(data_low && (!("such user" >< data_low)) &&
- (!("doesn't exist" >< data_low)) && (!("???" >< data_low))
- && (!("welcome to" >< data_low))){
- report = "
- There is a bug in the remote finger service which, when triggered, allows
- a user to force the remote finger daemon to display the list of the accounts
- that have never been used, by issuing the request :
-
- finger .@target
-
- This list will help an attacker to guess the operating system type. It will
- also tell him which accounts have never been used, which will often make him
- focus his attacks on these accounts.
-
- Here is the list of accounts we could obtain :
- " + data + "
-
- Solution : disable the finger service in /etc/inetd.conf and restart the inetd
- process, or upgrade your finger service.
-
- Risk factor : Medium";
- security_warning(port:port, data:report);
- set_kb_item(name:"finger/.@host", value:TRUE);
- }
-
- }
- }
-