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             AUSCERT External Security Bulletin Redistribution

                               ESB-2016.1760
           Cisco IOS and IOS XE Software Border Gateway Protocol
            Message Processing Denial of Service Vulnerability
                               18 July 2016

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

Product:           Cisco IOS and IOS XE Software
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Denial of Service -- Existing Account
Resolution:        Mitigation
CVE Names:         CVE-2016-1459  

Original Bulletin: 
   http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160715-bgp

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Cisco Security Advisory

Cisco IOS and IOS XE Software Border Gateway Protocol Message Processing 
Denial of Service Vulnerability

Medium

Advisory ID:

cisco-sa-20160715-bgp

Published:

2016 July 15 14:30 GMT

Version 1.0:

Final

CVSS Score:

Base - 4.9

Workarounds:

Yes

Cisco Bug IDs:

CSCuz21061

CVE-2016-1459

CWE-399

Summary

A vulnerability in Border Gateway Protocol (BGP) message processing functions
of Cisco IOS and IOS XE Software could allow an authenticated, remote attacker
to cause an affected device to reload.

The vulnerability is due to improper processing of crafted BGP attributes. An
attacker could exploit this vulnerability by sending crafted BGP messages to 
an affected device for processing when certain conditions are met. A 
successful exploit could allow the attacker to cause the affected device to 
reload, resulting in a denial of service (DoS) condition.

There are workarounds that address this vulnerability.

This advisory is available at the following link: 
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160715-bgp

Affected Products

Vulnerable Products

This vulnerability affects all releases of Cisco IOS and IOS XE Software that
support BGP. For more information, see the Cisco bug associated with this 
advisory.

Products Confirmed Not Vulnerable

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

Workarounds

Possible workarounds for this issue include setting a maxpath-limit value for
BGP MIBs or suppressing use of BGP MIBs.

Use of the following BGP MIB tables, objects, and indexes should be avoided as
a workaround:

    cbgpRouteAggregatorAddr

    cbgpRouteAggregatorAddrType

    cbgpRouteAggregatorAS

    cbgpRouteASPathSegment

    cbgpRouteAtomicAggregate

    cbgpRouteBest

    cbgpRouteLocalPref

    cbgpRouteLocalPrefPresent

    cbgpRouteMedPresent

    cbgpRouteMultiExitDis

    cbgpRouteNextHop

    cbgpRouteOrigin

    cbgpRouteUnknownAttr

Fixed Software

Cisco provides information about fixed software in Cisco bugs, which are 
accessible through the Cisco Bug Search Tool.

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 upgrade 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-20160715-bgp

Revision History

Version Description 		Section Status 	Date

1.0 	Initial public release. -	Final 	2016-July-15

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.

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