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AUSCERT External Security Bulletin Redistribution
ESB-2017.1003
Cisco Firepower Detection Engine Pragmatic General Multicast
Protocol Decoding Denial of Service Vulnerability
20 April 2017
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Firepower Detection Engine
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2016-6368
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170419-fpsnort
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Cisco Security Advisory
Cisco Firepower Detection Engine Pragmatic General Multicast Protocol Decoding
Denial of Service Vulnerability
High
Advisory ID:
cisco-sa-20170419-fpsnort
First Published:
2017 April 19 16:00 GMT
Version 1.0:
Final
Workarounds:
No workarounds available
Cisco Bug IDs:
CSCuz00876
CVE-2016-6368
CWE-399
CVSS Score:
Base 8.6, Temporal 8.6
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X
CVE-2016-6368
CWE-399
Summary
A vulnerability in the detection engine parsing of Pragmatic General
Multicast (PGM) protocol packets for Cisco Firepower System Software could
allow an unauthenticated, remote attacker to cause a denial of service
(DoS) condition due to the Snort process unexpectedly restarting.
The vulnerability is due to improper input validation of the fields in the
PGM protocol packet. An attacker could exploit this vulnerability by
sending a crafted PGM packet to the detection engine on the targeted
device. An exploit could allow the attacker to cause a DoS condition if the
Snort process restarts and traffic inspection is bypassed or traffic is
dropped.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170419-fpsnort
Affected Products
Vulnerable Products
This vulnerability affects Cisco Firepower System Software that has one or
more file action policies configured and is running on any of the following
Cisco products:
Adaptive Security Appliance (ASA) 5500-X Series with FirePOWER Services
Adaptive Security Appliance (ASA) 5500-X Series Next-Generation
Firewalls
Advanced Malware Protection (AMP) for Networks, 7000 Series Appliances
Advanced Malware Protection (AMP) for Networks, 8000 Series Appliances
Firepower 4100 Series Security Appliances
FirePOWER 7000 Series Appliances
FirePOWER 8000 Series Appliances
Firepower 9300 Series Security Appliances
FirePOWER Threat Defense for Integrated Services Routers (ISRs)
Industrial Security Appliance 3000
Sourcefire 3D System Appliances
Virtual Next-Generation Intrusion Prevention System (NGIPSv) for VMware
To determine whether any file action policies are configured in Cisco
Firepower System Software, administrators can do the following in the
Firepower System dashboard:
1. Choose Policies > Access Control > Malware and File. The dashboard
displays a list of file action policies that are configured for the
system.
2. Click the Report icon next to a policy to see details about the current
saved configuration for the policy.
Each file action policy specifies a set of rules and actions that defines
how to handle files that meet specific criteria. If one or more policies
specify a Block Files, Block Malware, or Detect Files action, the system is
vulnerable.
This vulnerability also affects the open source Snort project. For more
information, see the Snort website.
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this
vulnerability.
Cisco has confirmed that this vulnerability does not affect the following
Cisco products:
Adaptive Security Appliance (ASA) Software
Firepower Management Center
Intrusion Prevention System (IPS) Software
Meraki MX Security Appliance
Snort IPS for Integrated Services Routers (ISRs)
Details
This vulnerability can result in the Snort process restarting. While the
Snort process is restarting, Snort detection could be bypassed or all
network traffic inspection could fail. The behavior is platform and
configuration dependent.
FirePOWER Platforms
Passive and bypass interfaces will bypass Snort inspection and traffic
will pass through the device.
Routed, switched, and non-bypass interfaces will drop the traffic and
it will not pass through the device.
FirePOWER Threat Defense (FTD) will drop the traffic and it will not
pass through the device.
Adaptive Security Appliance (ASA) 5500-X Series with FirePOWER Services
If the ASA release supports the CLI command sfr fail-open and is
configured, traffic will bypass Snort and not be dropped.
Workarounds
There are no workarounds that address this vulnerability.
Fixed Software
Cisco has released free software updates that address the vulnerability
described in this advisory. Customers may only install and expect support
for software versions and feature sets for which they have purchased a
license. By installing, downloading, accessing, or otherwise using such
software upgrades, customers agree to follow the terms of the Cisco
software license:
http://www.cisco.com/c/en/us/td/docs/general/warranty/English/EU1KEN_.html
Additionally, customers may only download software for which they have a
valid license, procured from Cisco directly, or through a Cisco authorized
reseller or partner. In most cases this will be a maintenance upgrade to
software that was previously purchased. Free security software updates do
not entitle customers to a new software license, additional software
feature sets, or major revision upgrades.
When considering software upgrades, customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories and Alerts page, to determine exposure and a
complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded
contain sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release.
If the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance
providers.
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service
contract and customers who make purchases through third-party vendors but
are unsuccessful in obtaining fixed software through their point of sale
should obtain upgrades by contacting the Cisco TAC:
http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html.
Customers should have the product serial number available and be prepared
to provide the URL of this advisory as evidence of entitlement to a free
upgrade.
Fixed Releases
This vulnerability has been addressed in the following releases of Cisco
Firepower System Software:
5.4.0.10
5.4.1.9
6.0.1.3
6.1.0
6.2.0
Note: It is possible that certain fixed software releases for this
vulnerability are affected by a bug described in Cisco Field Notice
FN-64291 where a security appliance may fail to pass traffic after 213 days
of uptime. Customers should review this notice before determining a course
of action for addressing the vulnerability described in this advisory. The
issue described in the Cisco Field Notice is not a security vulnerability.
To upgrade the Firepower System Software, use one of the following methods:
With Firepower Management Center (FMC), customers should install the
fixed release of the software and reapply the access control policy
after the installation. The Snort version installed is dependent on the
FMC software release.
With Adaptive Security Device Manager (ASDM) or Firepower Device
Manager (FDM), customers should upgrade to the fixed release of the
software and reapply the access control policy after the installation.
Exploitation and Public Announcements
The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any public announcements or malicious use of the vulnerability that is
described in this advisory.
Source
Cisco would like to thank security researcher Oscar Mira for finding and
reporting this vulnerability.
Cisco Security Vulnerability Policy
To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy. This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
Subscribe to Cisco Security Notifications
Subscribe
URL
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170419-fpsnort
Revision History
Version Description Section Status Date
1.0 Initial public release. Final 2017-April-19
Legal Disclaimer
THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND
OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT
OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES
THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
A standalone copy or paraphrase of the text of this document that omits the
distribution URL is an uncontrolled copy and may lack important information
or contain factual errors. The information in this document is intended for
end users of Cisco products.
Cisco Security Vulnerability Policy
To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy. This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
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