Cisco IOS Software TCP Denial of Service Vulnerability (cisco-sa-20160620-isr)

# 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:/o:cisco:ios";

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.107063");
  script_version("2026-02-02T05:59:28+0000");
  script_tag(name:"last_modification", value:"2026-02-02 05:59:28 +0000 (Mon, 02 Feb 2026)");
  script_tag(name:"creation_date", value:"2016-10-20 12:56:24 +0200 (Thu, 20 Oct 2016)");
  script_tag(name:"cvss_base", value:"5.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_tag(name:"severity_vector", value:"CVSS:3.0/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:"2017-09-02 15:00:00 +0000 (Sat, 02 Sep 2017)");

  script_cve_id("CVE-2015-6289");

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

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

  script_name("Cisco IOS Software TCP Denial of Service Vulnerability (cisco-sa-20160620-isr)");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2016 Greenbone AG");
  script_family("CISCO");
  script_dependencies("gb_cisco_ios_consolidation.nasl");
  script_mandatory_keys("cisco/ios/detected");

  script_tag(name:"summary", value:"A vulnerability in the handling of remote TCP connections in
  Cisco IOS Software could allow an unauthenticated, remote attacker to cause a partial denial of
  service (DoS) condition due to low memory.");

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

  script_tag(name:"insight", value:"The vulnerability is due to the handling of out-of-order, or
  otherwise invalid, TCP packets on a remote connection to an affected device. An attacker could
  exploit this vulnerability by connecting to the device and then sending crafted TCP packets that
  are out of order or have invalid flags.");

  script_tag(name:"impact", value:"An exploit could allow the attacker to cause the device to
  report low-memory warnings, which could in turn cause a partial DoS condition. This vulnerability
  was initially found for Secure Shell Host (SSH) remote connections, but it could also affect
  other remote connections to the device.");

  script_tag(name:"solution", value:"See the referenced vendor advisory for a solution.");

  script_xref(name:"URL", value:"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160620-isr");


  exit(0);
}

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

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

affected = make_list(
  "12.2(33)SCI4",
  "15.3(3)JBB2",
  "15.5(3)M");

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

exit( 99 );