OpenBSD OpenSSH 6.8p1 - 9.9p1 MitM Vulnerability

# SPDX-FileCopyrightText: 2025 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:openbsd:openssh";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.114946");
  script_version("2025-02-20T08:47:14+0000");
  script_tag(name:"last_modification", value:"2025-02-20 08:47:14 +0000 (Thu, 20 Feb 2025)");
  script_tag(name:"creation_date", value:"2025-02-18 11:12:27 +0000 (Tue, 18 Feb 2025)");
  script_tag(name:"cvss_base", value:"7.1");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:H/Au:N/C:C/I:C/A:N");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2025-02-18 19:15:29 +0000 (Tue, 18 Feb 2025)");

  script_cve_id("CVE-2025-26465");

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

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

  script_name("OpenBSD OpenSSH 6.8p1 - 9.9p1 MitM Vulnerability");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2025 Greenbone AG");
  script_family("General");
  script_dependencies("gb_openssh_consolidation.nasl");
  script_mandatory_keys("openssh/detected");

  script_tag(name:"summary", value:"OpenBSD OpenSSH is prone to a man-in-the-middle (MitM)
  vulnerability.");

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

  script_tag(name:"insight", value:"ssh(1) in OpenSSH contained a logic error that allowed an
  on-path attacker (a.k.a MITM) to impersonate any server when the VerifyHostKeyDNS option is
  enabled. This option is off by default.");

  script_tag(name:"affected", value:"OpenBSD OpenSSH versions 6.8p1 through 9.9p1.");

  script_tag(name:"solution", value:"Update to version 9.9p2 or later.");

  script_xref(name:"URL", value:"https://www.openssh.com/txt/release-9.9p2");
  script_xref(name:"URL", value:"https://www.openssh.com/security.html");
  script_xref(name:"URL", value:"https://www.qualys.com/2025/02/18/openssh-mitm-dos.txt");
  script_xref(name:"URL", value:"https://blog.qualys.com/vulnerabilities-threat-research/2025/02/18/qualys-tru-discovers-two-vulnerabilities-in-openssh-cve-2025-26465-cve-2025-26466");
  script_xref(name:"URL", value:"https://www.openwall.com/lists/oss-security/2025/02/18/1");
  script_xref(name:"URL", value:"https://www.openwall.com/lists/oss-security/2025/02/18/4");

  exit(0);
}

include("version_func.inc");
include("host_details.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: "6.8p1", test_version2: "9.9p1")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "9.9p2", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);