Cisco IOS Software Tunnel Interfaces Security Bypass Vulnerability (cisco-sa-20151112-ios2)

# 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("1.3.6.1.4.1.25623.1.0.105636");
  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:"2016-05-03 19:12:29 +0200 (Tue, 03 May 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:P/A:N");

  script_cve_id("CVE-2015-6366");

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

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

  script_name("Cisco IOS Software Tunnel Interfaces Security Bypass Vulnerability (cisco-sa-20151112-ios2)");

  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 Cisco devices running IOS Software
  configured with access control lists (ACLs) could allow an unauthenticated, remote user connected
  to a tunnel interface to bypass configured ACLs on tunnel interfaces if the ACL on the physical
  interface permits the traffic to pass.");

  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 physical interface ignoring the
  tunnel interface ACLs. A user could exploit this vulnerability to bypass configured tunnel
  interface ACLs and pass denied traffic across tunnel interfaces.");

  script_tag(name:"impact", value:"If successful, the user could pass traffic as if the ACLs did
  not exist.");

  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-20151112-ios2");

  exit(0);
}

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

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

affected = make_list(
  "15.2(4)M6",
  "15.4(3)S" );

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 );