OpenSSH CBC Mode Information Disclosure Vulnerability

# SPDX-FileCopyrightText: 2009 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("1.3.6.1.4.1.25623.1.0.100153");
  script_version("2023-07-27T05:05:08+0000");
  script_cve_id("CVE-2008-5161");
  script_copyright("Copyright (C) 2009 Greenbone AG");
  script_tag(name:"last_modification", value:"2023-07-27 05:05:08 +0000 (Thu, 27 Jul 2023)");
  script_tag(name:"creation_date", value:"2009-04-23 21:21:19 +0200 (Thu, 23 Apr 2009)");
  script_tag(name:"cvss_base", value:"2.6");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:H/Au:N/C:P/I:N/A:N");
  script_category(ACT_GATHER_INFO);
  script_family("General");
  script_name("OpenSSH CBC Mode Information Disclosure Vulnerability");
  script_dependencies("gb_openssh_consolidation.nasl");
  script_mandatory_keys("openssh/detected");

  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/32319");

  script_tag(name:"impact", value:"Successful exploits will allow attackers to obtain four bytes of plaintext from
  an encrypted session.");

  script_tag(name:"affected", value:"Versions prior to OpenSSH 5.2 are vulnerable. Various versions of SSH Tectia
  are also affected.");

  script_tag(name:"insight", value:"The flaw is due to the improper handling of errors within an SSH session
  encrypted with a block cipher algorithm in the Cipher-Block Chaining 'CBC' mode.");

  script_tag(name:"solution", value:"Upgrade to OpenSSH 5.2 or later.");

  script_tag(name:"summary", value:"OpenSSH is prone to an information 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:"5.2" ) ) {
  report = report_fixed_ver( installed_version:vers, fixed_version:"5.2", install_path:path );
  security_message( port:port, data:report );
  exit( 0 );
}

exit( 99 );