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AUSCERT External Security Bulletin Redistribution
ESB-2017.2502
Cisco Firepower Detection Engine IPv6 Denial of Service Vulnerability
5 October 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-2017-12244
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171004-fpsnort
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Cisco Firepower Detection Engine IPv6 Denial of Service Vulnerability
High
Advisory ID:
cisco-sa-20171004-fpsnort
First Published:
2017 October 4 16:00 GMT
Version 1.0:
Final
Workarounds:
No workarounds available
Cisco Bug IDs:
CSCvd34776
CVSS Score:
Base 8.6
CVE-2017-12244
CWE-20
Summary
A vulnerability in the detection engine parsing of IPv6 packets for Cisco
Firepower System Software could allow an unauthenticated, remote attacker to
cause high CPU utilization or to cause a denial of service (DoS) condition
because the Snort process restarts unexpectedly.
The vulnerability is due to improper input validation of the fields in the
IPv6 extension header packet. An attacker could exploit this vulnerability by
sending a malicious IPv6 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. This vulnerability is specific to IPv6 traffic only.
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-20171004-fpsnort
Affected Products
Vulnerable Products
This vulnerability affects Cisco Firepower System Software Releases 6.0 and
later when the software has one or more file action policies configured and is
running on any of the following Cisco products:
3000 Series Industrial Security Appliances (ISR)
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 7000 Series Appliances
FirePOWER 8000 Series Appliances
Firepower Threat Defense for Integrated Services Routers (ISRs)
Firepower 2100 Series Security Appliances
Firepower 4100 Series Security Appliances
Firepower 9300 Series Security 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:
Choose Policies > Access Control > Malware and File. The dashboard
displays a list of file action policies that are configured for the system.
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.
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 Cisco Firepower
System Software Releases 5.3, 5.4.0, or 5.4.1.
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 Appliances
Snort IPS for Integrated Services Routers (ISRs)
Sourcefire 3D System Appliances
Details
This vulnerability can cause the Snort process to restart. 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
Firepower platforms will exhibit the following behaviors:
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 this command 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:
https://www.cisco.com/c/en/us/products/end-user-license-agreement.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:
https://www.cisco.com/c/en/us/support/web/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
Customers should upgrade to an appropriate release as indicated in the table
in this section. To help ensure a complete upgrade solution, consider that
this advisory is part of a collection that includes the following advisories:
cisco-sa-20171004-fpsnort: Cisco Firepower Detection Engine IPv6 Denial of
Service Vulnerability cisco-sa-20171004-ftd: Cisco Firepower Detection Engine
SSL Decryption Memory Consumption Denial of Service Vulnerability
In the following table, the left column lists major releases of Cisco
software. The center column indicates whether a major release is affected by
the vulnerability described in this advisory and the first minor release that
includes the fix for this vulnerability. The right column indicates whether a
major release is affected by all the vulnerabilities described in this
collection of advisories and the current recommended release for those
vulnerabilities.
Cisco First Fixed Recommended Release for This
Firepower Release for This Vulnerability and All
System Vulnerability Vulnerabilities Described in the
Software Collection of Advisories
Prior to 6.0 Not vulnerable N/A
6.0.1 6.0.1.4 (future release) 6.2.0.2
6.1.0 6.1.0.3 6.1.0.6 (future release) or 6.2.0.2
6.2.0 6.2.0.2 6.2.0.3
6.2.1 Vulnerable; migrate 6.2.2
to 6.2.2
6.2.2 Not vulnerable 6.2.2
To upgrade the Firepower System Software, use one of the following methods:
When using Firepower Management Center (FMC) to upgrade the software,
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.
When using Adaptive Security Device Manager (ASDM) or Firepower Device
Manager (FDM) to upgrade the software, 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
This vulnerability was found during resolution of a Cisco TAC support case.
URL
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171004-fpsnort
Revision History
Version Description Section Status Date
1.0 Initial public release. - Final 2017-October-04
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