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AUSCERT External Security Bulletin Redistribution
Cisco IOS XR for Cisco ASR 9000 Series Aggregation Services
Routers Interface Flap Vulnerability
13 April 2016
AusCERT Security Bulletin Summary
Product: Cisco ASR 9000 Series Routers
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2016-1376
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Cisco Security Advisory
Cisco IOS XR for Cisco ASR 9000 Series Aggregation Services Routers Interface
Advisory ID: cisco-sa-20160412-asr
Published: 2016 April 12 07:00 GMT
Version 1.0: Final
Base - 4.3
No workarounds available
Cisco Bug IDs:
A vulnerability in packet processing functions of Cisco IOS XR Software
running on Cisco ASR 9000 Series Aggregation Services Routers could allow an
unauthenticated, remote attacker to cause cyclic redundancy check (CRC) and
symbol errors on the receiving interface of an affected device, which may lead
to an interface flap.
The vulnerability is due to improper processing of packets that contain
certain crafted bit patterns. An attacker could exploit this vulnerability by
sending crafted packets to be processed by a line card of an affected device.
A successful exploit could allow the attacker to cause CRC and symbol errors
on the receiving interface of the device, which may lead to an interface flap.
Cisco has released software updates that address this vulnerability. There are
no workarounds that address this vulnerability.
This advisory is available at the following link:
Cisco IOS XR Software Releases 4.2.3, 4.3.0, 4.3.4, and 5.3.1 running on Cisco
ASR 9000 Series Aggregation Services Routers are affected by this
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this
There are no workarounds that address this vulnerability.
Information about fixed software is documented in the Cisco bug, which is
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
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.
Version Description Section Status Date
1.0 Initial public release. Final 2016-April-12
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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