Cisco Security Advisory
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AV:N/AC:L/Au:N/C:N/I:N/A:P/E:F/RL:OF/RC:C
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A vulnerability in IPv6 packet fragment reassembly of StarOS for Cisco Aggregation Services Router (ASR) 5000 Series Switch could allow an unauthenticated, remote attacker to cause an unexpected reload of the Network Processing Unit (NPU) process.
The vulnerability is due to lack of proper input validation of the IPv6 fragment lengths. An attacker could exploit this vulnerability by sending a crafted IPv6 fragment chain to the targeted device. An exploit could allow the attacker to cause a denial of service (DoS) condition if the NPU process unexpectedly reloads. The DoS condition could temporarily impact user traffic.
There are no workarounds that address this vulnerability.
This advisory is available at the following link:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20161207-asr
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Vulnerable Products
This vulnerability affects Cisco Aggregation Services Router (ASR) 5000. For information about affected software releases, consult the Cisco bug ID(s) at the top of this advisory.Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this vulnerability.
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The ASR5K will write out a core file for the NPU process. This file can be viewed by using the following CLI command:
# show crash <#> === ==================== ======== ========== =============== ======================= # Time Process Card/CPU/ SW HW_SER_NUM PID VERSION MIO / Crash Card === ==================== ======== ========== =============== ======================= 1 2010-Feb-16+07:56:37 npu 05/0/15340 19.0.M0.61045 #######################
Contact the Cisco Technical Assistance Center (TAC) to review the core file and determine whether the device has been compromised by exploitation of this vulnerability.
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There are no workarounds that address this vulnerability.
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For information about fixed software releases, consult the Cisco bug ID(s) at the top of this advisory.
When considering software upgrades, customers are advised to consult the advisories for Cisco products, which are available from the Cisco Security Advisories and Alerts page, to determine exposure and a complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded 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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Show LessVersion Description Section Status Date 1.0 Initial public release. — Final 2016-December-07
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