Cisco Security AdvisoryMedium
Advisory ID:
cisco-sa-20160412-asr
First Published:
2016 April 12 07:00 GMT
Last Updated:
2016 April 20 15:13 GMT
Version 1.1:
Workarounds:
No workarounds available
Cisco Bug IDs:
CVSS Score:
Base 4.3,
Temporal 3.6
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AV:N/AC:M/Au:N/C:N/I:N/A:P/E:F/RL:OF/RC:C
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AV:N/AC:M/Au:N/C:N/I:N/A:P/E:F/RL:OF/RC:C
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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: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160412-asr
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Vulnerable Products
Cisco IOS XR Software Releases 4.2.3, 4.3.0, 4.3.2, 4.3.4, and 5.3.1 running on Cisco ASR 9000 Series Aggregation Services Routers are affected by this vulnerability.Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this vulnerability.
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There are no workarounds that address this vulnerability.
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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 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 1.1 Added an affected release of Cisco IOS XR Software. Vulnerable Products Final 2016-April-20 1.0 Initial public release. — Final 2016-April-12
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