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ESB-2016.0404 - [Cisco] Cisco 1000 Series Connected Grid Router: Denial of service - Existing account

Date: 18 February 2016

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2016.0404
         Cisco 1000 Series Connected Grid Routers SNMP BRIDGE MIB
                      Denial of Service Vulnerability
                             18 February 2016

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

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

Product:           Cisco 1000 Series Connected Grid Router
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Denial of Service -- Existing Account
Resolution:        Mitigation
CVE Names:         CVE-2016-1333  

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160216-grid

- --------------------------BEGIN INCLUDED TEXT--------------------

Cisco Security Advisory

Cisco 1000 Series Connected Grid Routers SNMP BRIDGE MIB Denial of Service 
Vulnerability

Medium

Advisory ID: cisco-sa-20160216-grid

Published: 2016 February 16 22:00 GMT

Version 1.0: Final

CVSS Score:

Base - 6.8

Workarounds:

Yes

Cisco Bug IDs:

CSCux89878

CVE-2016-1333

CWE-399

Summary

A vulnerability in the Simple Network Management Protocol (SNMP) BRIDGE 
Management Information Base (MIB) of the Cisco 1000 Series Connected Grid 
Routers could allow an authenticated, remote attacker to cause a denial of 
service (DoS) condition.

The vulnerability is due to a faulty implementation of certain SNMP Object 
Identifiers (OIDs) within the BRIDGE MIB. An SNMP request for certain Object 
Identifiers (OIDs) within the BRIDGE MIB can cause the device to reload 
unexpectedly. If an attacker knows the SNMP community string, the attacker 
could exploit this vulnerability by performing an authenticated SNMP request 
of the BRIDGE MIB OID to an affected device. An exploit could allow the 
attacker to cause the affected device to reload with each SNMP request, 
creating a DoS condition.

Cisco has released not software updates that address this vulnerability. 
Workarounds that mitigate this vulnerability are available.

This advisory is available at the following link: 
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160216-grid

Affected Products

Vulnerable Products

Cisco 1000 Series Connected Grid Router is affected by this vulnerability if 
SNMP functionality is configured in the software.

Products Confirmed Not Vulnerable

No other Cisco products are currently known to be affected by this 
vulnerability.

 Indicators of Compromise

Exploitation of this vulnerability will cause an affected device to reload and
generate a core file. Contact the Cisco Technical Assistance Center (TAC) to 
review the file and determine whether the device has been compromised by 
exploitation of this vulnerability.

Workarounds

Administrator can disable SNMP functionality if it is not required. If SNMP 
functionality is required, administrators can discontinue polling BRIDGE MIB 
OIDs.

Fixed Software

When considering software upgrades, customers are advised to consult the Cisco
Security Advisories and Responses archive at http://www.cisco.com/go/psirt and
review subsequent advisories 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.

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.

URL

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160216-grid

Revision History

Version 	Description 		Section 	Status 	Date

1.0 		Initial public release. 		Final 	2016-February-16

Legal Disclaimer

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.

- --------------------------END INCLUDED TEXT--------------------

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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
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