A vulnerability in NetFlow processing in Cisco IOS XR Software for ASR 9000 Series Aggregation Services Routers could allow an unauthenticated, adjacent attacker to cause a lockup and eventual reload of a Network Processor (NP) chip and a line card processing traffic. The vulnerability is due to improper NetFlow sampling of malformed IP version 4 (IPv4) or IP version 6 (IPv6) packets. An attacker could exploit this vulnerability by sending a stream of malformed IPv4 or IPv6 packets to be processed through an affected device. An exploit could allow the attacker to cause a lockup and eventual reload of an NP chip and a line card, leading to a denial of service (DoS) condition. Cisco has confirmed the vulnerability in a security notice and released software updates. To exploit this vulnerability, an attacker must be on the same broadcast or collision domain as the targeted device to send a stream of malformed IPv4 or IPv6 packets to the device. This access requirement may reduce the likelihood of a successful exploit. For an attacker to exploit this vulnerability, NetFlow sampling must be configured on the targeted device. Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
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.
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.
| Version | Description | Section | Status | Date |
| 1.0 | Initial Release | NA | Final | 2014-Jul-23 |
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