OpenSSH < 4.7 Improper Input Validation Vulnerability

# Copyright (C) 2021 Greenbone Networks GmbH
# 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-or-later
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
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CPE = "cpe:/a:openbsd:openssh";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.150634");
  script_version("2021-05-28T11:51:20+0000");
  script_tag(name:"last_modification", value:"2021-05-28 11:51:20 +0000 (Fri, 28 May 2021)");
  script_tag(name:"creation_date", value:"2021-05-27 14:42:43 +0000 (Thu, 27 May 2021)");
  script_tag(name:"cvss_base", value:"7.5");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:P/A:P");

  script_cve_id("CVE-2007-4752");

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

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

  script_name("OpenSSH < 4.7 Improper Input Validation Vulnerability");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2021 Greenbone Networks GmbH");
  script_family("General");
  script_dependencies("gb_openssh_consolidation.nasl");
  script_mandatory_keys("openssh/detected");

  script_tag(name:"summary", value:"ssh in OpenSSH before 4.7 does not properly handle when an
  untrusted cookie cannot be created and uses a trusted X11 cookie instead, which allows attackers
  to violate intended policy and gain privileges by causing an X client to be treated as trusted.");

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

  script_tag(name:"insight", value:"Please see the references for more information on the vulnerabilities.");

  script_tag(name:"affected", value:"OpenSSH version 4.7 and prior.");

  script_tag(name:"solution", value:"Update to version 4.8 or later.");

  script_xref(name:"URL", value:"https://www.openssh.com/txt/release-4.7");

  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:"4.7" ) ) {
  report = report_fixed_ver( installed_version:vers, fixed_version:"4.8", install_path:path );
  security_message( port:port, data:report );
  exit( 0 );
}

exit( 99 );