Cisco Email Security Appliance Advanced Malware Protection Attachment Scanning Denial of Service Vulnerability

2016-10-27T00:00:00
ID OPENVAS:1361412562310140028
Type openvas
Reporter This script is Copyright (C) 2016 Greenbone Networks GmbH
Modified 2019-10-09T00:00:00

Description

A vulnerability in the email attachment scanning functionality of the Advanced Malware Protection (AMP) feature of Cisco AsyncOS Software for Cisco Email Security Appliances could allow an unauthenticated, remote attacker to cause an affected device to stop scanning and forwarding email messages due to a denial of service (DoS) condition.

The vulnerability is due to improper handling of UU-encoded files that are attached to an email message. An attacker could exploit this vulnerability by sending a crafted email message with a UU- encoded file attachment through an affected device. The scanning of the attachment could cause the mail handling process of the affected software to restart, resulting in a DoS condition. After the mail handling process restarts, the software resumes scanning for the same attachment, which could cause the mail handling process to restart again. A successful exploit could allow the attacker to cause a repeated DoS condition.

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

                                        
                                            ###############################################################################
# OpenVAS Vulnerability Test
#
# Cisco Email Security Appliance Advanced Malware Protection Attachment Scanning Denial of Service 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("1.3.6.1.4.1.25623.1.0.140028");
  script_cve_id("CVE-2016-1486");
  script_tag(name:"cvss_base", value:"7.8");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:C");
  script_version("2019-10-09T06:43:33+0000");

  script_name("Cisco Email Security Appliance Advanced Malware Protection Attachment Scanning Denial of Service Vulnerability");

  script_xref(name:"URL", value:"http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20161026-esa2");

  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 attachment scanning functionality of the Advanced Malware Protection
  (AMP) feature of Cisco AsyncOS Software for Cisco Email Security Appliances could allow an
  unauthenticated, remote attacker to cause an affected device to stop scanning and forwarding email
  messages due to a denial of service (DoS) condition.

  The vulnerability is due to improper handling of UU-encoded files that are attached to an email
  message. An attacker could exploit this vulnerability by sending a crafted email message with a UU-
  encoded file attachment through an affected device. The scanning of the attachment could cause the
  mail handling process of the affected software to restart, resulting in a DoS condition. After the
  mail handling process restarts, the software resumes scanning for the same attachment, which could
  cause the mail handling process to restart again. A successful exploit could allow the attacker to
  cause a repeated DoS condition.

  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 14:13:14 +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(
  '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',
  '9.7.0-125' );

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 );