Cisco Email Security Appliance Drop Bypass Vulnerability

2016-10-27T00:00:00
ID OPENVAS:1361412562310140025
Type openvas
Reporter This script is Copyright (C) 2016 Greenbone Networks GmbH
Modified 2019-10-09T00:00:00

Description

A vulnerability in the configured security policies, including drop email filtering, in Cisco AsyncOS for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to bypass a configured drop filter by using an email with a corrupted attachment.

The vulnerability is due to improper error handling. An attacker could exploit this vulnerability by sending an email message with a corrupted attachment. A successful exploit could allow the attacker to bypass a configured drop filter.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

                                        
                                            ###############################################################################
# OpenVAS Vulnerability Test
#
# Cisco Email Security Appliance Drop Bypass Vulnerability
#
# Authors:
# Michael Meyer <michael.meyer@greenbone.net>
#
# Copyright:
# Copyright (c) 2016 Greenbone Networks GmbH
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
###############################################################################

CPE = "cpe:/h:cisco:email_security_appliance";

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.140025");
  script_cve_id("CVE-2016-6357");
  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("2019-10-09T06:43:33+0000");

  script_name("Cisco Email Security Appliance Drop Bypass Vulnerability");

  script_xref(name:"URL", value:"http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20161026-esa5");

  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 configured security policies, including drop email filtering, in Cisco
  AsyncOS for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to
  bypass a configured drop filter by using an email with a corrupted attachment.

  The vulnerability is due to improper error handling. An attacker could exploit this vulnerability by
  sending an email message with a corrupted attachment. A successful exploit could allow the attacker
  to bypass a configured drop filter.

  Cisco has released software updates that address this vulnerability. There are no workarounds that
  address this vulnerability.");

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

  script_tag(name:"last_modification", value:"2019-10-09 06:43:33 +0000 (Wed, 09 Oct 2019)");
  script_tag(name:"creation_date", value:"2016-10-27 14:09:52 +0200 (Thu, 27 Oct 2016)");
  script_category(ACT_GATHER_INFO);
  script_family("CISCO");
  script_copyright("This script is Copyright (C) 2016 Greenbone Networks GmbH");
  script_dependencies("gb_cisco_esa_version.nasl");
  script_mandatory_keys("cisco_esa/installed");
  exit(0);
}

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

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

affected = make_list(
  '9.9.6-026',
  '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 );