Cisco Security Advisory
Cisco IOS and IOS XE Software Border Gateway Protocol Message Processing Denial of Service Vulnerability
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AV:N/AC:H/Au:S/C:N/I:N/A:C/E:F/RL:U/RC:C
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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: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160715-bgp
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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
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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.
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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.
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To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
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Show LessVersion Description Section Status Date 1.0 Initial public release. - Final 2016-July-15
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