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AUSCERT External Security Bulletin Redistribution
Cisco IoT Field Network Director Memory Exhaustion Denial of Service
7 September 2017
AusCERT Security Bulletin Summary
Product: Cisco IoT Field Network Director
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2017-6780
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Cisco Security Advisory
Cisco IoT Field Network Director Memory Exhaustion Denial of Service
Advisory ID: cisco-sa-20170906-fnd
First Published: 2017 September 6 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs:
Base 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:X/RL:X/RC:X
A vulnerability in the TCP throttling process for Cisco IoT Field Network
Director (IoT-FND) could allow an unauthenticated, remote attacker to cause
the system to consume additional memory, eventually forcing the device to
The vulnerability is due to insufficient rate-limiting protection. An attacker
could exploit this vulnerability by sending a high rate of TCP packets to a
specific group of open listening ports on a targeted device. An exploit could
allow the attacker to cause the system to consume additional memory. If enough
available memory is consumed, the system will restart, creating a temporary
denial of service (DoS) condition. The DoS condition will end after the device
has finished the restart process.
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:
This vulnerability affects the following Cisco products:
Connected Grid Network Management System, if running a software release prior
to IoT-FND Release 4.0
IoT Field Network Director, if running a software release prior to IoT-FND
Note: Cisco Connected Grid Network Management System and Cisco IoT Field
Network Director are the same product. Prior to Release 3.0, this product was
named Cisco Connected Grid Network Management System. As of Release 3.0, this
product is named Cisco IoT Field Network Director (IoT-FND).
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this
Indicators of Compromise
If this vulnerability has been exploited, the error log file on the device
(/opt/cgms/server/cgms/log/cgms_watchdog.log) could contain the following
ERROR: IoT-FND application server is not responding. Retry count: 3, Max
ERROR: Max retry reached.
INFO: IoT-FND is running. Shutting down IoT-FND ...
INFO: Starting IoT-FND ...
Contact the Cisco Technical Assistance Center (TAC) to further determine if
the device has been exploited by this vulnerability.
There are no workarounds that address this vulnerability.
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:
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
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:
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.
This vulnerability is fixed in Cisco IoT-FND Release 4.0. This software can be
obtained by contacting the Cisco TAC.
Note: Please refer to the Cisco IoT Field Network Director User Guide for
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.
This vulnerability was found during internal security testing.
Version Description Section Status Date
1.0 Initial public release. - Final 2017-September-06
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.
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