Operating System:

[Cisco]

Published:

07 February 2013

Protect yourself against future threats.

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2013.0164
Cisco NX-OS High Availability Policy Remote Denial of Service Vulnerability
                              7 February 2013

===========================================================================

        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-2012-2469  

Original Bulletin: 
   http://tools.cisco.com/security/center/viewAlert.x?alertId=26619

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Cisco NX-OS High Availability Policy Remote Denial of Service Vulnerability

Threat Type: 		CWE-399: Resource Management Errors 
IntelliShield ID: 	26619 
Version: 		1 
First Published: 	February 05, 2013 09:48 AM EST 
Last Published: 	February 05, 2013 09:48 AM EST 
Vector: 		Adjacent Network 
Authentication: 	None 
Exploit: 		Functional 
Port: 			Not Available 
CVE: 			CVE-2012-2469 
BugTraq ID: 		54833

Urgency: 		Unlikely Use
Credibility: 		Confirmed
Severity: 		Mild

CVSS Base: 		6.1 
CVSS Temporal: 		5.0

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 system. 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 system.

The vulnerability is due to improper handling of Cisco Discovery Protocol 
packets by the affected software. An unauthenticated, remote attacker could 
exploit this vulnerability by sending crafted Cisco Discovery Protocol packets
to the targeted system. When the packets are processed, the attacker could 
reset the device remotely, resulting in a DoS condition.

Cisco has confirmed this vulnerability and released updated software.

Warning Indicators 
Cisco NX-OS versions 4.2, 5.0, 5.1, and 5.2 running on the Cisco Nexus 7000 
series switches are vulnerable.

IntelliShield Analysis 
This vulnerability is exploitable only on systems that have the High 
Availability policy configured for Reset.

Vendor Announcements
Cisco has released a release note enclosure for Cisco bugID CSCtk34535
http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCtk34535
and CSCtk19132 
http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCtk19132
at the following link: Cisco Nexus 7000 Series NX-OS Release 5.2
http://www.cisco.com/en/US/docs/switches/datacenter/sw/5_x/nx-os/release/notes/52_nx-os_release_note.html

Impact
An unauthenticated, remote attacker could exploit this vulnerability to
cause a device reset, resulting in a DoS condition.

Technical Information 
Technical details are not available.

Safeguards
Administrators are advised to apply the appropriate updates.

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 can obtain updates 
through the Software Center at the following link:
http://www.cisco.com/cisco/software/navigator.html?a=a&i=rpm
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 NX-OS  	4.2 (1)SV1(5.2), (2), (3), (4), (5), .1, 2(1)SV1(4), Base 
	Software	| 5.0 (0.54) , (3), (4), (5), (6), Base | 5.1 Base | 5.2(1) Base

Associated Products: 
N/A

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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
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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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