cfingerd Wildcard Argument Information Disclosure

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(10038);
  script_version("1.31");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/04/11");

  script_cve_id("CVE-1999-0259");

  script_name(english:"cfingerd Wildcard Argument Information Disclosure");

  script_set_attribute(attribute:"synopsis", value:
"The remote finger server has an information disclosure vulnerability.");
  script_set_attribute(attribute:"description", value:
"The remote host is running 'cfingerd', a finger daemon.

There is a bug in the remote cfinger daemon that allows a remote
attacker to get the lists of the users of this system when issuing
the command :

  finger search.**@victim

This information can be used by a remote attacker to mount further
attacks.");
  script_set_attribute(attribute:"see_also", value:"https://seclists.org/bugtraq/1997/May/160");
  script_set_attribute(attribute:"see_also", value:"https://seclists.org/bugtraq/1997/May/171");
  script_set_attribute(attribute:"solution", value:
"There is no known solution at this time.  Use another finger daemon,
or disable this service in inetd.conf.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N");

  script_set_attribute(attribute:"vuln_publication_date", value:"1997/05/23");
  script_set_attribute(attribute:"plugin_publication_date", value:"1999/06/22");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:infodrom:cfingerd");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

  script_copyright(english:"This script is Copyright (C) 1999-2022 Tenable Network Security, Inc.");

  script_dependencies("find_service1.nasl");
  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("search.**\r\n");

  send(socket:soc, data:buf);
  recv_line(socket:soc, length:2048);
  data = recv_line(socket:soc, length:2048);
  minus = "----";
  if(minus >< data)
  {
	for(i=1;i<11;i=i+1){
		data = recv_line(socket:soc, length:2048);
		if(!data)exit(0);
		}
	data = recv_line(socket:soc, length:2048);
	if(data){
  		data_low = tolower(data);
  		if(data_low && ("root" >< data_low)) 
		 {
     		 security_warning(port);
		 set_kb_item(name:"finger/search.**@host", value:TRUE);
		 }
		}
  }
  close(soc);
 }
}