Cisco IOS Software for Cisco Catalyst 6500 Series Switches and 7600 Series Routers ACL Bypass Vulnerability (cisco-sa-20161005-catalyst)

# 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("1.3.6.1.4.1.25623.1.0.106330");
  script_version("2026-03-18T05:59:10+0000");
  script_tag(name:"last_modification", value:"2026-03-18 05:59:10 +0000 (Wed, 18 Mar 2026)");
  script_tag(name:"creation_date", value:"2016-10-06 10:27:02 +0700 (Thu, 06 Oct 2016)");
  script_tag(name:"cvss_base", value:"4.3");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:P/I:N/A:N");
  script_tag(name:"severity_vector", value:"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N");
  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-2016-6422");

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

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

  script_name("Cisco IOS Software for Cisco Catalyst 6500 Series Switches and 7600 Series Routers ACL Bypass Vulnerability (cisco-sa-20161005-catalyst)");

  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", "cisco/ios/model");

  script_tag(name:"summary", value:"A vulnerability in the ternary content addressable memory
  (TCAM) share access control list (ACL) functionality of Cisco IOS Software running on Supervisor
  Engine 720 and Supervisor Engine 32 Modules for Cisco Catalyst 6500 Series Switches and Cisco
  7600 Series Routers could allow an unauthenticated, remote attacker to bypass access control
  entries (ACEs) in a port access control list (PACL).");

  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 improper implementation of PACL
  logic for ACEs that include a greater than operator, a less than operator, a tcp flag, the
  established keyword, or the range keyword. An attacker could exploit this vulnerability by
  sending packets that meet one or more filter criteria through an affected device.");

  script_tag(name:"impact", value:"A successful exploit could allow the attacker to bypass the
  filters defined in the PACL for a targeted system.");

  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-20161005-catalyst");

  exit(0);
}

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

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

if( model !~ "^WS-C(65|76)" )
  exit( 0 );

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

if( version == "12.2(33)SXJ9" ) {
  report = report_fixed_ver( installed_version:version, fixed_version:"See advisory" );
  security_message( port:0, data:report );
  exit( 0 );
}

exit( 99 );