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             AUSCERT External Security Bulletin Redistribution

                               ESB-2012.0781
          Cisco NX-OS FCIP Remote Denial of Service Vulnerability
                              15 August 2012

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Cisco NX-OS
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2012-1340  

Original Bulletin: 
   http://tools.cisco.com/security/center/viewAlert.x?alertId=26617

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Cisco NX-OS FCIP Remote Denial of Service Vulnerability
 	
Threat Type:		CWE-119: Buffer Errors
IntelliShield ID:	26617
Version:		1
First Published:	August 10, 2012 05:30 PM EDT
Last Published:		August 10, 2012 05:30 PM EDT
Port:	 		Not Available
CVE:			CVE-2012-1340
BugTraq ID:		54843

Urgency:	 	Unlikely Use	
Credibility:	 	Confirmed	
Severity:	 	Mild Damage	
 
Version Summary:
Cisco NX-OS contains a vulnerability that could allow an unauthenticated,
remote attacker to cause a denial of service condition on a targeted device. 
Updates are available.
 
 
Description
Cisco NX-OS contains a vulnerability that could allow an unauthenticated,
remote attacker to cause a denial of service (DoS) condition on a targeted
device.

The vulnerability is due to improper processing of certain packets by the
affected devices. An unauthenticated, remote attacker could exploit this
vulnerability by sending malicious packets to the device. Processing the
packets could cause a DoS condition on a targeted device. 

Cisco has confirmed this vulnerability and has released updated software.
 
Warning Indicators
Cisco NX-OS versions 4.2 and 5.2 are vulnerable when they are running on Cisco
MDS 9000 Series devices.
 
IntelliShield Analysis
A successful exploit could allow an attacker to cause the vulnerable device to
reload, potentially preventing authorized users from accessing network
resources served by the targeted device.

In typical network configuration, such devices are placed behind a firewall. To
achieve the objective, an attacker would need access to an internal network to
send crafted packets to a vulnerable device. This access requirement could
limit the possibility of a successful exploit.
 
Vendor Announcements
Cisco has issued release notes for Cisco bug ID CSCtn93151 at the following
link: Cisco MDS NX-OS Release 5.2(2)
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to cause a
targeted device to reload a certain module, resulting in a DoS condition.
 
Technical Information
The vulnerability is due to improper processing of certain Fibre Channel over
IP (FCIP) headers by the affected Cisco NX-OS versions running on MDS 9000
series devices.

An unauthenticated, remote attacker could exploit this vulnerability by sending
crafted FCIP headers to the device. Processing of the packets could cause a
device to reload the affected module, leading to DoS condition on the device.
 
Safeguards
Administrators are advised to apply the appropriate updates.

Administrators are advised to implement an intrusion prevention system (IPS) or
intrusion detection system (IDS) to help detect and prevent attacks that
attempt to exploit this vulnerability.

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

Administrators are advised to monitor affected systems.
 
Patches/Software
Cisco customers with active contracts can obtain updates through the Software
Center at the following link: Cisco. Cisco customers without contracts can
obtain upgrades by contacting the Cisco Technical Assistance Center at
1-800-553-2447 or 1-408-526-7209 or via e-mail at tac@cisco.com.
 
Alert History
 
Initial Release

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

Primary Products:
Cisco	Cisco MDS 9000 NX-OS	4.2 Base | 5.2 Base

Associated Products:
N/A

Alerts and bulletins on the Cisco Security Intelligence Operations Portal are
highlighted by analysts in the Cisco Threat Operations Center and represent a
subset of the comprehensive content that is available through Cisco Security
IntelliShield Alert Manager Service. This customizable threat and vulnerability
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for full access, please visit the IntelliShield trial registration page.

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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