Cisco Web Security Appliance MIME Header Bypass 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("1.3.6.1.4.1.25623.1.0.140031");
  script_cve_id("CVE-2016-6372");
  script_tag(name:"cvss_base", value:"5.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:N/A:N");
  script_version("2023-07-21T05:05:22+0000");

  script_name("Cisco Web Security Appliance MIME Header Bypass Vulnerability");

  script_xref(name:"URL", value:"http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20161026-esawsa2");

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

  script_tag(name:"solution", value:"See the referenced vendor advisory for a solution.");
  script_tag(name:"summary", value:"A vulnerability in the email message and content filtering for malformed Multipurpose Internet Mail
Extensions (MIME) headers of Cisco AsyncOS Software for Cisco Email Security Appliances (ESA) and
Web Security Appliances (WSA) could allow an unauthenticated, remote attacker to bypass the
filtering functionality of the targeted device. Emails that should have been quarantined could
instead be processed.

The vulnerability is due to improper error handling when malformed MIME headers are present in the
email attachment. An attacker could exploit this vulnerability by sending an email with a crafted
attachment encoded with MIME. A successful exploit could allow the attacker to bypass the configured
email message and content filtering.

Cisco has released software updates that address this vulnerability. Workarounds that address this
vulnerability are not available.");

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

  script_tag(name:"last_modification", value:"2023-07-21 05:05:22 +0000 (Fri, 21 Jul 2023)");
  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:"2017-07-29 01:34:00 +0000 (Sat, 29 Jul 2017)");
  script_tag(name:"creation_date", value:"2016-10-27 14:52:53 +0200 (Thu, 27 Oct 2016)");
  script_category(ACT_GATHER_INFO);
  script_family("CISCO");
  script_copyright("Copyright (C) 2016 Greenbone AG");
  script_dependencies("gb_cisco_wsa_version.nasl");
  script_mandatory_keys("cisco_wsa/installed");
  exit(0);
}

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

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

affected = make_list(
  '8.0.0',
  '8.0.1-023',
  '8.5.0-000',
  '8.5.0-ER1-198',
  '8.5.6-052',
  '8.5.6-073',
  '8.5.6-074',
  '8.5.6-106',
  '8.5.6-113',
  '8.5.7-042',
  '8.6.0',
  '8.6.0-011',
  '8.9.0',
  '8.9.1-000',
  '8.9.2-032',
  '9.0.0',
  '9.0.0-212',
  '9.0.0-461',
  '9.0.5-000',
  '9.1.0',
  '9.1.0-011',
  '9.1.0-101',
  '9.1.0-032',
  '9.1.1-000',
  '9.4.0',
  '9.4.4-000',
  '9.5.0-000',
  '9.5.0-201',
  '9.6.0-000',
  '9.6.0-042',
  '9.6.0-051',
  '9.9.0',
  '9.9.6-026',
  '9.7.0-125',
  '9.7.1-066' );

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 );