Greenbone OS - Kernel Denial of Service Vulnerabilities (Jun 2019)

# SPDX-FileCopyrightText: 2019 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:/o:greenbone:greenbone_os";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.107017");
  script_cve_id("CVE-2019-11477", "CVE-2019-11478", "CVE-2019-11479");
  script_version("2024-02-19T05:05:57+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:"2024-02-19 05:05:57 +0000 (Mon, 19 Feb 2024)");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2023-01-17 21:28:00 +0000 (Tue, 17 Jan 2023)");
  script_tag(name:"creation_date", value:"2019-06-21 11:11:07 +0200 (Fri, 21 Jun 2019)");

  script_name("Greenbone OS - Kernel Denial of Service Vulnerabilities (Jun 2019)");

  script_category(ACT_GATHER_INFO);
  script_family("Denial of Service");
  script_copyright("Copyright (C) 2019 Greenbone AG");
  script_dependencies("gb_greenbone_os_consolidation.nasl");
  script_mandatory_keys("greenbone/gos/detected");

  script_tag(name:"summary", value:"The Kernel in Greenbone OS is prone to multiple denial of service vulnerabilities.");

  script_tag(name:"insight", value:"Multiple TCP Selective Acknowledgement (SACK) and Maximum Segment Size (MSS)
  networking vulnerabilities may cause denial-of-service conditions in Linux kernels as used
  in Greenbone OS.");

  script_tag(name:"impact", value:"A remote attacker could use this to cause a denial of service or kernel failure (panic) by:

  - triggering an integer overflow (CVE-2019-11477)

  - sending a sequence of specifically crafted selective acknowledgements (SACK),
    that may cause a fragmented TCP queue (CVE-2019-11478)

  - making use of the default maximum segment size (MSS), which is hard-coded to 48 bytes.
    This may cause an increase of fragmented packets (CVE-2019-11479).");

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

  script_tag(name:"solution", value:"Update to Greenbone OS 4.2.29, 4.3.14 or 5.0.3.");

  script_tag(name:"affected", value:"Greenbone OS prior to version 4.2.29, 4.3.14 or 5.0.3 respectively.");

  script_xref(name:"URL", value:"https://www.kb.cert.org/vuls/id/905115");

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

  exit(0);
}

include( "host_details.inc" );
include( "version_func.inc" );

if( ! version = get_app_version( cpe:CPE, nofork:TRUE ) )
  exit( 0 );

version = str_replace( string:version, find:"-", replace:"." );

if( version_is_less( version:version, test_version:"4.2.29" ) ) {
  report = report_fixed_ver( installed_version:version, fixed_version:"4.2.29" );
  security_message( port:0, data:report );
  exit( 0 );
}

if( version =~ "^4\.3" ) {
  if( version_is_less( version:version, test_version:"4.3.14" ) ) {
    report = report_fixed_ver( installed_version:version, fixed_version:"4.3.14" );
    security_message( port:0, data:report );
    exit( 0 );
  }
}

if( version =~ "^5\.0" ) {
  if( version_is_less( version:version, test_version:"5.0.3" ) ) {
    report = report_fixed_ver( installed_version:version, fixed_version:"5.0.3" );
    security_message( port:0, data:report );
    exit( 0 );
  }
}

exit( 99 );