Cisco Email Security Appliance Malformed MIME Header Filtering Bypass Vulnerability

# SPDX-FileCopyrightText: 2017 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:email_security_appliance";

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.106555");
  script_cve_id("CVE-2017-3818");
  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_version("2025-12-19T15:41:09+0000");

  script_name("Cisco Email Security Appliance Malformed MIME Header Filtering Bypass Vulnerability");

  script_xref(name:"URL", value:"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170201-esa1");

  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 Multipurpose Internet Mail Extensions (MIME) scanner
of Cisco AsyncOS Software for Cisco Email Security Appliances (ESA) could allow an unauthenticated, remote
attacker to bypass configured user filters on the device.");

  script_tag(name:"insight", value:"The vulnerability is due to improper error handling of a malformed MIME
header in an email attachment. An attacker could exploit this vulnerability by sending an email with a crafted
MIME attachment.");

  script_tag(name:"impact", value:"A successful exploit could allow the attacker to bypass configured user
filters to drop the email. The malformed MIME headers may not be RFC compliant. However, some mail clients could
still allow users to access the attachment, which may not have been properly filtered by the device.");

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

  script_tag(name:"last_modification", value:"2025-12-19 15:41:09 +0000 (Fri, 19 Dec 2025)");
  script_tag(name:"severity_vector", value:"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2017-07-25 01:29:00 +0000 (Tue, 25 Jul 2017)");
  script_tag(name:"creation_date", value:"2017-02-02 12:14:35 +0700 (Thu, 02 Feb 2017)");
  script_category(ACT_GATHER_INFO);
  script_family("CISCO");
  script_copyright("Copyright (C) 2017 Greenbone AG");
  script_dependencies("gb_cisco_esa_consolidation.nasl");
  script_mandatory_keys("cisco/esa/detected");

  exit(0);
}

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

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

if (version == "9.7.1-066") {
  report = report_fixed_ver(installed_version: version, fixed_version: "9.8.0-092");
  security_message(port: 0, data: report);
  exit(0);
}

exit(99);