Cisco Web Security Appliance File Transfer Protocol Denial of Service Vulnerability

# SPDX-FileCopyrightText: 2016 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:/h:cisco:web_security_appliance";

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.106294");
  script_version("2025-09-05T15:40:40+0000");
  script_tag(name:"last_modification", value:"2025-09-05 15:40:40 +0000 (Fri, 05 Sep 2025)");
  script_tag(name:"creation_date", value:"2016-09-29 12:29:18 +0700 (Thu, 29 Sep 2016)");
  script_tag(name:"cvss_base", value:"4.3");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:N/I:N/A:P");
  script_tag(name:"severity_vector", value:"CVSS:3.0/AV:N/AC:H/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:"2017-07-30 01:29:00 +0000 (Sun, 30 Jul 2017)");

  script_cve_id("CVE-2016-6416");

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

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

  script_name("Cisco Web Security Appliance File Transfer Protocol Denial of Service Vulnerability");

  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2016 Greenbone AG");
  script_family("CISCO");
  script_dependencies("gb_cisco_wsa_version.nasl");
  script_mandatory_keys("cisco_wsa/installed");

  script_tag(name:"summary", value:"A vulnerability in the local File Transfer Protocol (FTP) service on the
Cisco AsyncOS for Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to cause a denial
of service (DoS) condition.");

  script_tag(name:"insight", value:"The vulnerability is due to lack of throttling of FTP connections. An
attacker could exploit this vulnerability by sending a flood of FTP traffic to the local FTP service on the
targeted device.");

  script_tag(name:"impact", value:"An exploit could allow the attacker to cause a DoS condition.");

  script_tag(name:"solution", value:"Upgrade to version 10.0.0-237 or later.");

  script_xref(name:"URL", value:"http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160928-aos");

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

  exit(0);
}

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

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

affected = make_list(
  '9.0.0-162',
  '9.1.0-000',
  '9.1.0-070',
  '9.5.0-235',
  '9.5.0-284',
  '9.5.0-444' );

foreach af ( affected )
{
  if( version == af )
  {
    report = report_fixed_ver(  installed_version:version, fixed_version: "10.0.0-237" );
    security_message( port:0, data:report );
    exit( 0 );
  }
}

exit(0);