Bitvise SSH Server < 7.41 Security Bypass Vulnerability

# SPDX-FileCopyrightText: 2018 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:bitvise:winsshd";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.813387");
  script_version("2024-02-22T14:37:29+0000");
  script_tag(name:"cvss_base", value:"7.8");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:C");
  script_tag(name:"last_modification", value:"2024-02-22 14:37:29 +0000 (Thu, 22 Feb 2024)");
  script_tag(name:"creation_date", value:"2018-06-04 13:54:02 +0530 (Mon, 04 Jun 2018)");
  script_name("Bitvise SSH Server < 7.41 Security Bypass Vulnerability");
  script_copyright("Copyright (C) 2018 Greenbone AG");
  script_category(ACT_GATHER_INFO);
  script_family("General");
  script_dependencies("gb_bitvise_ssh_server_consolidation.nasl");
  script_mandatory_keys("bitvise/ssh_server/detected");

  script_xref(name:"URL", value:"https://www.bitvise.com/flowssh-version-history#security-notification-741");

  script_tag(name:"summary", value:"Bitvise SSH Server is prone to a security bypass
  vulnerability.");

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

  script_tag(name:"insight", value:"The flaw is due to an incorrect delayed initialization in a
  compression library used by Bitvise software.");

  script_tag(name:"impact", value:"Successful exploitation will allow an attacker to corrupt
  decompressed data in SSH session and bypass security restrictions.");

  script_tag(name:"affected", value:"Bitvise SSH Server version prior to 7.41.");

  script_tag(name:"solution", value:"Update to version 7.41 or later.");

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

  exit(0);
}

include("version_func.inc");
include("host_details.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: "7.41")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "7.41", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);