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Cisco Security

Cisco IOS and IOS XE Software Ethernet Connectivity Fault Management Vulnerability

 
Threat Type:CWE-119: Buffer Errors
IntelliShield ID:36184
Version:1
First Published:2014 October 24 18:10 GMT
Last Published:2014 October 24 18:10 GMT
Port: Not available
CVE:CVE-2014-3409
BugTraq ID:70715
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:6.1 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:5.0
 
 
Version Summary:Cisco IOS and Cisco IOS XE Software contains a vulnerability that could allow an unauthenticated, adjacent attacker to cause a denial of service condition. Updates are available.
 
 
Description
A vulnerability in the Ethernet Connectivity Fault Management (CFM) handling code of Cisco IOS and Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition.

The vulnerability is due to improper parsing of malformed CFM packets sent to an affected device. An attacker could exploit this vulnerability by sending malformed CFM packets to be processed by an affected device. An exploit could allow the attacker to cause a reload of the affected device.

Cisco has confirmed the vulnerability in a security notice and released software updates.
 
Warning Indicators
At the time this alert was first published, Cisco IOS Software version 12.2(33)SRE9a and prior and Cisco IOS XE Software version 3.13S and prior were vulnerable. Later releases Cisco IOS and Cisco IOS XE Software may also be vulnerable.
 
IntelliShield Analysis
To exploit this vulnerability, an attacker must be on the same broadcast or collision domain as an affected device. This access requirement decreases the likelihood of a successful exploit.

Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
 
Vendor Announcements
Cisco has released a security notice at the following link: CVE-2014-3409

Customers are advised to consult Cisco bug ID CSCuq93406 for the most complete list of affected product versions.
 
Impact
An unauthenticated, adjacent attacker could exploit this vulnerability to cause an affected device to reload, resulting in a DoS condition.
 
Technical Information
The vulnerability is due to improper parsing of malformed CFM packets sent to a device running an affected version of Cisco IOS or Cisco IOS XE Software.

An unauthenticated, adjacent attacker could exploit this vulnerability by sending malformed CFM packets to be processed by an affected device. An exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.
 
Safeguards
Administrators are advised to apply the appropriate updates.

Administrators are advised to allow only trusted users to have network access.

Administrators are advised to monitor network traffic for security-related network activity. Cisco NetFlow can identify such activity. For more information about Cisco NetFlow, see Introduction to Cisco IOS NetFlow - A Technical Overview.

Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.

Administrators are advised to monitor affected systems.
 
Patches/Software
Cisco customers with active contracts should contact their Cisco support team for assistance in upgrading to a software version that includes fixes for this vulnerability. Cisco customers without contracts may contact the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at tac@cisco.com for assistance.
 
Alert History
 
Initial Release


Product Sets
 
The security vulnerability applies to the following combinations of products.

Primary Products:
CiscoIOS 12.2SRE 12.2(33)SRE, 12.2(33)SRE0a, 12.2(33)SRE1, 12.2(33)SRE10, 12.2(33)SRE11, 12.2(33)SRE12, 12.2(33)SRE2, 12.2(33)SRE3, 12.2(33)SRE4, 12.2(33)SRE5, 12.2(33)SRE6, 12.2(33)SRE7, 12.2(33)SRE7a, 12.2(33)SRE8, 12.2(33)SRE9, 12.2(33)SRE9a
CiscoCisco IOS XE Software 3.1S .0, .1, .2, .3 | 3.2S .0, .1, .2 | 3.3S .0, .1, .2 | 3.4S .0, .1, .2, .3, .4, .5, .6 | 3.5S Base, .0, .1, .2 | 3.6S Base, .0, .1, .2 | 3.7S Base, .0, .1, .2, .3, .4, .5, .6 | 3.9S .0, .1, .2 | 3.10S .0, .0a, .1, .2, .3, .4 | 3.11S .1, .2 | 3.12S .0 | 3.13S .0

Associated Products:
N/A



LEGAL DISCLAIMER
The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.
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