MyBB < 1.8.21 Multiple Vulnerabilities

# SPDX-FileCopyrightText: 2019 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

CPE = "cpe:/a:mybb:mybb";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.113410");
  script_version("2025-04-30T05:39:51+0000");
  script_tag(name:"last_modification", value:"2025-04-30 05:39:51 +0000 (Wed, 30 Apr 2025)");
  script_tag(name:"creation_date", value:"2019-06-17 11:33:50 +0000 (Mon, 17 Jun 2019)");
  script_tag(name:"cvss_base", value:"6.5");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:S/C:P/I:P/A:P");
  script_tag(name:"severity_vector", value:"CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2019-06-20 12:46:00 +0000 (Thu, 20 Jun 2019)");

  script_cve_id("CVE-2019-12830", "CVE-2019-12831");

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

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

  script_name("MyBB < 1.8.21 Multiple Vulnerabilities");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2019 Greenbone AG");
  script_family("Web application abuses");
  script_dependencies("sw_mybb_http_detect.nasl");
  script_mandatory_keys("mybb/detected");

  script_tag(name:"summary", value:"MyBB is prone to multiple vulnerabilities.");

  script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present on the target host.");

  script_tag(name:"insight", value:"The following vulnerabilities exist:

  - An attacker can exploit a parsing flaw in the Private Message / Post renderer that leads to
  [video] BBCode persistent XSS to take over any forum account, aka a nested video MyCode issue.
  (CVE-2019-12830)

  - An attacker can abuse a default behavior of MySQL on many systems (that leads to truncation of
  strings that are too long for a database column) to create a PHP shell in the cache directory of a
  targeted forum via a crafted XML import, aka theme import stylesheet name RCE. (CVE-2019-12831)

  - Find Orphaned Attachments reflected XSS

  - Post edit reflected XSS

  - Private Messaging folders SQL injection

  - Potential phar deserialization through Upload Path");

  script_tag(name:"impact", value:"Successful exploitation would allow an attacker to execute
  arbitrary code on the target machine.");

  script_tag(name:"affected", value:"MyBB through version 1.8.20.");

  script_tag(name:"solution", value:"Update to version 1.8.21 or later.");

  script_xref(name:"URL", value:"https://blog.mybb.com/2019/06/10/mybb-1-8-21-released-security-maintenance-release/");
  script_xref(name:"URL", value:"https://blog.ripstech.com/2019/mybb-stored-xss-to-rce/");

  exit(0);
}

include("host_details.inc");
include("version_func.inc");

if (!port = get_app_port(cpe: CPE))
  exit(0);

if (!infos = get_app_version_and_location(cpe: CPE, port: port, exit_no_version: TRUE))
  exit(0);

version = infos["version"];
location = infos["location"];

if (version_is_less(version: version, test_version: "1.8.21")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "1.8.21", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);