OpenSSH 'sshd' GSSAPI Credential Disclosure Vulnerability

# Copyright (C) 2011 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.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

CPE = "cpe:/a:openbsd:openssh";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.902488");
  script_version("2022-04-28T13:38:57+0000");
  script_cve_id("CVE-2005-2798");
  script_tag(name:"cvss_base", value:"5.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:N/A:N");
  script_tag(name:"last_modification", value:"2022-04-28 13:38:57 +0000 (Thu, 28 Apr 2022)");
  script_tag(name:"creation_date", value:"2011-11-16 12:24:22 +0530 (Wed, 16 Nov 2011)");
  script_name("OpenSSH 'sshd' GSSAPI Credential Disclosure Vulnerability");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2011 Greenbone Networks GmbH");
  script_family("General");
  script_dependencies("gb_openssh_consolidation.nasl");
  script_mandatory_keys("openssh/detected");

  script_xref(name:"URL", value:"http://secunia.com/advisories/16686");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/14729");
  script_xref(name:"URL", value:"http://securitytracker.com/id?1014845");
  script_xref(name:"URL", value:"https://lists.mindrot.org/pipermail/openssh-unix-announce/2005-September/000083.html");

  script_tag(name:"impact", value:"Successful exploitation could allows remote attackers to bypass security
  restrictions and gain escalated privileges.");

  script_tag(name:"affected", value:"OpenSSH version prior to 4.2.");

  script_tag(name:"insight", value:"The flaw is due to an error in handling GSSAPI credential delegation,
  Which allow GSSAPI credentials to be delegated to users who log in with methods other than GSSAPI authentication
  (e.g. public key) when the client requests it.");

  script_tag(name:"solution", value:"Upgrade OpenSSH to 4.2 or later.");

  script_tag(name:"summary", value:"OpenSSH sshd with GSSAPI enabled is prone to credential disclosure vulnerability.");

  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( version:vers, test_version:"4.2" ) ) {
  report = report_fixed_ver( installed_version:vers, fixed_version:"4.2", install_path:path );
  security_message( port:port, data:report );
  exit( 0 );
}

exit( 99 );