GitLab 11.3.x - 12.9.7, 12.10.x - 12.10.6, 13.0.0 Incorrect Permissions Check Vulnerability

# SPDX-FileCopyrightText: 2022 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:gitlab:gitlab";

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.170052");
  script_version("2025-08-29T05:38:41+0000");
  script_tag(name:"last_modification", value:"2025-08-29 05:38:41 +0000 (Fri, 29 Aug 2025)");
  script_tag(name:"creation_date", value:"2022-03-23 20:50:27 +0000 (Wed, 23 Mar 2022)");
  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:L/UI:N/S:U/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2020-06-17 15:17:00 +0000 (Wed, 17 Jun 2020)");

  script_cve_id("CVE-2020-13270");

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

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

  script_name("GitLab 11.3.x - 12.9.7, 12.10.x - 12.10.6, 13.0.0 Incorrect Permissions Check Vulnerability");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2022 Greenbone AG");
  script_family("Web application abuses");
  script_dependencies("gb_gitlab_consolidation.nasl");
  script_mandatory_keys("gitlab/detected");

  script_tag(name:"summary", value:"GitLab is prone to an incorrect permissions check
  vulnerability.");

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

  script_tag(name:"insight", value:"Missing permission check on fork relation creation in GitLab
  allows guest users to create a fork relation on restricted public projects via API.");

  script_tag(name:"affected", value:"GitLab version 11.3.x through 12.9.7, 12.10.x through 12.10.6
  and 13.0.0.");

  script_tag(name:"solution", value:"Update to version 12.9.8, 12.10.7, 13.0.1 or later.");

  script_xref(name:"URL", value:"https://gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-13270.json");

  exit(0);
}

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

if (isnull(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: "11.3.0", test_version2: "12.9.7")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "12.9.8", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

if (version_in_range(version: version, test_version: "12.10.0", test_version2: "12.10.6")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "12.10.7", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

if (version_is_equal(version: version, test_version: "13.0.0")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "13.0.1", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);