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Cisco Security Advisory: Cisco StarOS Interface Forwarding Denial of Service Vulnerability

Advisory ID: cisco-sa-20180418-staros

Revision: 1.0

For Public Release: 2018 April 18 16:00 GMT

Last Updated: 2018 April 18 16:00 GMT

CVE ID(s): CVE-2018-0239

CVSS Score v(3): 8.6 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

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Summary

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A vulnerability in the egress packet processing functionality of the Cisco StarOS operating system for Cisco Aggregation Services Router (ASR) 5700 Series devices and Virtualized Packet Core (VPC) System Software could allow an unauthenticated, remote attacker to cause an interface on the device to cease forwarding packets. The device may need to be manually reloaded to clear the condition.

The vulnerability is due to the failure to properly check that the length of a packet to transmit does not exceed the maximum supported length of the network interface card (NIC). An attacker could exploit this vulnerability by sending a crafted IP packet or a series of crafted IP fragments through an interface on the targeted device. A successful exploit could allow the attacker to cause the network interface to cease forwarding packets. This vulnerability could be triggered by either IPv4 or IPv6 network traffic.

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:

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-staros [“https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-staros”]

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