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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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