code | #
# (C) Tenable Network Security, Inc.
#
include("compat.inc");
if (description)
{
script_id(10072);
script_version("1.28");
script_cvs_date("Date: 2018/08/10 18:07:07");
script_cve_id("CVE-1999-0198");
script_name(english:"Finger .@host Unused Account Disclosure");
script_summary(english:"Finger .@host feature");
script_set_attribute(attribute:"synopsis", value:
"The finger service running on the remote host has an information
disclosure vulnerability.");
script_set_attribute(attribute:"description", value:
"It is possible to force the remote finger daemon to display a list of
accounts that have never been used by issuing the request :
finger .@target
A remote attacker could use this information to guess which operating
system is running or mount further attacks against these accounts.");
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b5a66556");
script_set_attribute(attribute:"solution", value:"Disable or filter access to the finger daemon.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N");
script_set_attribute(attribute:"plugin_publication_date", value:"1999/06/22");
script_set_attribute(attribute:"vuln_publication_date", value:"1995/01/01");
script_set_attribute(attribute:"plugin_type", value:"remote");
script_set_attribute(attribute:"exploited_by_nessus", value:"true");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Misc.");
script_copyright(english:"This script is Copyright (C) 1999-2018 Tenable Network Security, Inc.");
script_dependencies("find_service1.nasl", "finger.nasl");
script_require_ports("Services/finger", 79);
exit(0);
}
#
# The script code starts here
#
include("global_settings.inc");
include("misc_func.inc");
port = get_service(svc:"finger", default:79, exit_on_fail:TRUE);
soc = open_sock_tcp(port);
if (!soc) exit(1, "Failed to open a socket on port "+port+".");
# Cisco
data = recv(socket:soc, length:2048, timeout:5);
if (data) exit(0, "The service listening on port "+port+" sent a spontaneous header.");
buf = string(".\r\n");
send(socket:soc, data:buf);
data = recv(socket:soc, length:65535);
close(soc);
if (strlen(data) < 100) exit(0, "The service listening on port "+port+" sent a response of less than 100 characters.");
data_low = tolower(data);
if (
!("such user" >< data_low) &&
!("doesn't exist" >< data_low) &&
!("???" >< data_low) &&
!("welcome to" >< data_low) &&
!("http/1.1 400 " >< data_low)
)
{
set_kb_item(name:"finger/.@host", value:TRUE);
if (report_verbosity > 0)
{
report =
'\nNessus was able to obtain a list of the following accounts : ' +
'\n' +
data +
'\n';
security_warning(port:port, extra:report);
}
else security_warning(port);
exit(0);
}
else exit(0, "The service listening on port "+port+" is not affected.");
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