OpenSSH Certificate Validation Security Bypass Vulnerability

# SPDX-FileCopyrightText: 2014 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("1.3.6.1.4.1.25623.1.0.105004");
  script_cve_id("CVE-2014-2653");
  script_version("2023-07-27T05:05:09+0000");
  script_name("OpenSSH Certificate Validation Security Bypass Vulnerability");
  script_tag(name:"cvss_base", value:"5.8");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:P/I:P/A:N");
  script_tag(name:"last_modification", value:"2023-07-27 05:05:09 +0000 (Thu, 27 Jul 2023)");
  script_tag(name:"creation_date", value:"2014-04-09 12:45:39 +0200 (Wed, 09 Apr 2014)");
  script_category(ACT_GATHER_INFO);
  script_family("General");
  script_copyright("Copyright (C) 2014 Greenbone AG");
  script_dependencies("gb_openssh_consolidation.nasl");
  script_mandatory_keys("openssh/detected");

  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/66459");

  script_tag(name:"impact", value:"Attackers can exploit this issue to bypass certain security
  restrictions and perform unauthorized actions. This may aid in further attacks.");

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

  script_tag(name:"insight", value:"The verify_host_key function in sshconnect.c in the client in
  OpenSSH 6.6 and earlier allows remote servers to trigger the skipping of
  SSHFP DNS RR checking by presenting an unacceptable HostCertificate.");

  script_tag(name:"solution", value:"Updates are available. Please see the references for more information.");

  script_tag(name:"summary", value:"OpenSSH is prone to a security-bypass vulnerability.");

  script_tag(name:"affected", value:"OpenSSH 6.6 and prior are vulnerable.");

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

  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 );

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

if( version_is_less_equal( version:vers, test_version:"6.6" ) ) {
  report = report_fixed_ver( installed_version:vers, fixed_version:"See references", install_path:path );
  security_message( port:port, data:report );
  exit( 0 );
}

exit( 99 );