MyBB 1.2.0 < 1.8.29 RCE Vulnerability (GHSA-8gxx-vmr9-h39p)

# SPDX-FileCopyrightText: 2021 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("1.3.6.1.4.1.25623.1.0.147113");
  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:"2021-11-05 07:20:53 +0000 (Fri, 05 Nov 2021)");
  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:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2021-11-05 19:10:00 +0000 (Fri, 05 Nov 2021)");

  script_cve_id("CVE-2021-43281");

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

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

  script_name("MyBB 1.2.0 < 1.8.29 RCE Vulnerability (GHSA-8gxx-vmr9-h39p)");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2021 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 a remote code execution (RCE)
  vulnerability.");

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

  script_tag(name:"insight", value:"The Admin CP's Settings management module does not validate
  setting types correctly on insertion and update, making it possible to add settings of supported
  type php with PHP code, executed on on Change Settings pages. This results in an RCE
  vulnerability.

  The vulnerable module requires Admin CP access with the 'Can manage settings' permission.");

  script_tag(name:"affected", value:"MyBB version 1.2.0 through 1.8.28.");

  script_tag(name:"solution", value:"Update to version 1.8.29 or later.");

  script_xref(name:"URL", value:"https://github.com/mybb/mybb/security/advisories/GHSA-8gxx-vmr9-h39p");

  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_in_range(version: version, test_version: "1.2.0", test_version2: "1.8.28")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "1.8.29", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);