Cisco IOS XR Software for Cisco ASR 9001 Aggregation Services Routers Fragmented Packet Denial of Service Vulnerability (cisco-sa-20160810-iosxr)

# 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_xr";

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.106177");
  script_version("2026-03-13T15:49:08+0000");
  script_tag(name:"last_modification", value:"2026-03-13 15:49:08 +0000 (Fri, 13 Mar 2026)");
  script_tag(name:"creation_date", value:"2016-08-16 08:52:29 +0700 (Tue, 16 Aug 2016)");
  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:"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:"2016-11-28 20:31:00 +0000 (Mon, 28 Nov 2016)");

  script_cve_id("CVE-2016-6355");

  script_tag(name:"qod_type", value:"remote_banner_unreliable"); # nb: SMU available

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

  script_name("Cisco IOS XR Software for Cisco ASR 9001 Aggregation Services Routers Fragmented Packet Denial of Service Vulnerability (cisco-sa-20160810-iosxr)");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2016 Greenbone AG");
  script_family("CISCO");
  script_dependencies("gb_cisco_ios_xr_consolidation.nasl");
  script_mandatory_keys("cisco/ios_xr/detected", "cisco/ios_xr/model");

  script_tag(name:"summary", value:"A vulnerability in the driver processing functions of Cisco IOS
  XR Software for Cisco ASR 9001 Aggregation Services Routers could allow an unauthenticated,
  remote attacker to cause a memory leak on the route processor (RP) of an affected device, which
  could cause the device to drop all control-plane protocols and lead to a denial of service
  condition (DoS) on a targeted system.");

  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 improper handling of crafted,
  fragmented packets that are directed to an affected device. An attacker could exploit this
  vulnerability by sending crafted, fragmented packets to an affected device for processing and
  reassembly.");

  script_tag(name:"impact", value:"A successful exploit could allow the attacker to cause a memory
  leak on the RP of the device, which could cause the device to drop all control-plane protocols
  and eventually lead to a DoS condition on the targeted system.");

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

  script_xref(name:"URL", value:"http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160810-iosxr");

  exit(0);
}

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

if (!model = get_kb_item("cisco/ios_xr/model"))
  exit(0);

if ("ASR9K" >!< model)
  exit(0);

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

affected = make_list(
  '5.1.0',
  '5.1.1',
  '5.1.2',
  '5.1.1.K9SEC',
  '5.1.3',
  '5.2.0',
  '5.2.1',
  '5.2.2',
  '5.2.4',
  '5.2.3',
  '5.2.5',
  '5.3.0',
  '5.3.1',
  '5.3.2' );

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);