Generic HTTP Directory Traversal (Web Root) - Active Check

# SPDX-FileCopyrightText: 2017 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("1.3.6.1.4.1.25623.1.0.106756");
  script_version("2024-03-22T15:42:29+0000");
  script_tag(name:"last_modification", value:"2024-03-22 15:42:29 +0000 (Fri, 22 Mar 2024)");
  script_tag(name:"creation_date", value:"2017-04-18 14:50:27 +0200 (Tue, 18 Apr 2017)");
  script_tag(name:"cvss_base", value:"7.8");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:C/I:N/A:N");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2023-02-24 17:56:00 +0000 (Fri, 24 Feb 2023)");

  # nb: Unlike other VTs we're using the CVEs line by line here for easier addition of new CVEs
  # / to avoid too large diffs.
  script_xref(name:"CISA", value:"Known Exploited Vulnerability (KEV) catalog");
  script_xref(name:"URL", value:"https://www.cisa.gov/known-exploited-vulnerabilities-catalog");
  script_cve_id("CVE-2010-2307",
                "CVE-2010-4231",
                "CVE-2014-2323",
                "CVE-2015-2166",
                "CVE-2015-5688",
                "CVE-2017-11456",
                "CVE-2017-16806",
                "CVE-2018-10201",
                "CVE-2018-10956",
                "CVE-2018-14064",
                "CVE-2018-18778",
                "CVE-2018-19326",
                "CVE-2018-7490",
                "CVE-2018-7719",
                "CVE-2018-8727",
                "CVE-2019-18922",
                "CVE-2019-20085",
                "CVE-2019-7315",
                "CVE-2019-9726",
                "CVE-2020-12447",
                "CVE-2020-15050",
                "CVE-2020-24571",
                "CVE-2020-5410",
                "CVE-2021-3019",
                "CVE-2021-40978",
                "CVE-2021-41773",
                "CVE-2021-42013",
                "CVE-2022-26233",
                "CVE-2022-38794",
                "CVE-2023-22855", # nb: See https://hesec.de/posts/cve-2023-22855/
                "CVE-2023-46307"); # nb: See https://seclists.org/fulldisclosure/2023/Nov/9

  script_name("Generic HTTP Directory Traversal (Web Root) - Active Check");
  script_category(ACT_ATTACK);
  script_copyright("Copyright (C) 2017 Greenbone AG");
  script_family("Web application abuses");
  script_dependencies("find_service.nasl", "httpver.nasl", "os_detection.nasl",
                      "global_settings.nasl");
  script_require_ports("Services/www", 80);
  script_exclude_keys("Settings/disable_cgi_scanning");

  script_xref(name:"URL", value:"https://owasp.org/www-community/attacks/Path_Traversal");

  script_tag(name:"summary", value:"Generic check for HTTP directory traversal vulnerabilities on
  the web root level of the remote web server.");

  script_tag(name:"impact", value:"Successfully exploiting this issue may allow an attacker to
  access paths and directories that should normally not be accessible by a user. This can result in
  effects ranging from disclosure of confidential information to arbitrary code execution.");

  script_tag(name:"affected", value:"The following products are known to be affected by the pattern
  checked in this VT:

  - No CVE: Project Jug

  - CVE-2010-2307: Motorola SURFBoard cable modem SBV6120E

  - CVE-2010-4231: Camtron CMNC-200 Full HD IP Camera and TecVoz CMNC-200 Megapixel IP Camera

  - CVE-2014-2323: Lighttpd

  - CVE-2015-2166: Ericsson Drutt MSDP (Instance Monitor)

  - CVE-2015-5688: Geddy

  - CVE-2017-11456: Geneko GWR router

  - CVE-2017-16806: Ulterius Server

  - CVE-2018-10201: Ncomputing vSPace Pro 10 and 11

  - CVE-2018-10956: IPConfigure Orchid Core VMS 2.0.5

  - CVE-2018-14064: uc-http service 1.0.0 on VelotiSmart WiFi B-380 camera devices

  - CVE-2018-18778: mini_httpd

  - CVE-2018-19326: Zyxel VMG1312-B10D

  - CVE-2018-7490: uWSGI

  - CVE-2018-7719: Acrolinx Server

  - CVE-2018-8727: Mirasys DVMS Workstation 5.12.6

  - CVE-2019-18922: Allied Telesis AT-GS950/8

  - CVE-2019-20085: TVT NVMS-1000

  - CVE-2019-7315: Genie Access IP Camera

  - CVE-2019-9726: Homematic CCU3

  - CVE-2020-12447: Onkyo TX-NR585 Web Interface

  - CVE-2020-15050: Suprema BioStar2

  - CVE-2020-24571: NexusQA NexusDB

  - CVE-2020-5410: Spring Cloud Config

  - CVE-2021-3019: ffay lanproxy

  - CVE-2021-40978: mkdocs 1.2.2 built-in dev-server. Note: This CVE has been disputed by the vendor
  because the dev-server is generally seen as being insecure and shouldn't be used in production.
  Nevertheless this doesn't make this CVE void so it is included here.

  - CVE-2021-41773 and CVE-2021-42013: Apache HTTP Server

  - CVE-2022-26233: Barco Control Room Management Suite

  - CVE-2022-38794: Zaver

  - CVE-2023-22855: Kardex Mlog. Note: The CVE is about a remote code execution (RCE) vulnerability
  but the product is also affected by a directory traversal vulnerability and thus the CVE was added
  here.

  - CVE-2023-46307: etc-browser

  Other products might be affected as well.");

  script_tag(name:"vuldetect", value:"Sends various crafted HTTP requests to the web root of the
  remote web server and checks the responses.");

  script_tag(name:"solution", value:"Contact the vendor for a solution.");

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

  script_timeout(900);

  exit(0);
}

include("misc_func.inc");
include("host_details.inc");
include("os_func.inc");
include("http_func.inc");
include("http_keepalive.inc");
include("port_service_func.inc");
include("list_array_func.inc");

# nb:
# - Prints out the "final" URLs below
# - In that print out a `log_message()` is used as `display()` is having problem because it would interpret e.g. `\e` wrongly.
debug = FALSE;

depth = get_kb_item("global_settings/dir_traversal_depth");
traversals = traversal_pattern(extra_pattern_list: make_list(""), depth: depth);
files = traversal_files();
count = 0;
max_count = 3;
suffixes = make_list(
  "",
  "%23vt/test", # Spring Cloud Config flaw (CVE-2020-5410) but other environments / technologies might be affected as well
  "%00"); # PHP < 5.3.4 but other environments / technologies might be affected as well

prefixes = make_list(
  "",
  "//////", # See e.g. https://medium.com/appsflyerengineering/nginx-may-be-protecting-your-applications-from-traversal-attacks-without-you-even-knowing-b08f882fd43d
  "static//////", # From https://github.com/detectify/ugly-duckling/blob/master/modules/crowdsourced/nginx-merge-slashes-path-traversal.json
  "\\\\\\", # Reverse cases for the ones above.
  "static\\\\\\",
  "c:"); # Seen for Pallets Werkzeug (CVE-2019-14322) on a specific directory but other environments / technologies might be affected in a similar way so it was also added here

file_path_variants = make_list(
  "plain", # nb: Just e.g. "/etc/passwd" or "windows/win.ini" as returned by traversal_files()
  "%2f",
  "\",
  "%5c");

port = http_get_port(default: 80);

foreach traversal (traversals) {

  foreach pattern (keys(files)) {

    file = files[pattern];

    foreach prefix (prefixes) {

      foreach suffix (suffixes) {

        foreach file_path_variant (file_path_variants) {

          # nb: Only do modification to the file if any encoding variant has been requested
          if (file_path_variant != "plain") {

            # nb: No slash so just continue as this is already covered in the "plain" variant
            if ("/" >!< file)
              continue;

            check_file = str_replace(string: file, find: "/", replace: file_path_variant);

          } else {
            check_file = file;
          }

          url = "/" + prefix + traversal + check_file + suffix;

          if (debug) log_message(data: url);

          req = http_get(port: port, item: url);

          # nb: Don't use http_keepalive_send_recv() here as embedded devices which are often vulnerable
          # shows issues when requesting a keepalive connection.
          res = http_send_recv(port: port, data: req);

          if (egrep(pattern: pattern, string: res, icase: TRUE)) {
            count++;
            vuln += http_report_vuln_url(port: port, url: url) + '\n\n';
            vuln += 'Request:\n' + chomp(req) + '\n\nResponse:\n' + chomp(res) + '\n\n\n';
            break; # nb: Reporting one suffix is enough
          }
        }
        if (count >= max_count)
          break; # nb: No need to continue with that much findings
      }
      if (count >= max_count)
        break;
    }
    if (count >= max_count)
      break;
  }
  if (count >= max_count)
    break;
}

if (vuln) {
  report = 'The following affected URL(s) were found (limited to ' + max_count + ' results):\n\n' + chomp(vuln);
  security_message(port: port, data: report);
}

# nb: No "exit(99)" as the system might be still affected by one or more attached CVE(s) but just no
# HTTP service is exposed
exit(0);