-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Cisco IOS XR Software BVI Routed Packet Denial of Service Vulnerability Advisory ID: cisco-sa-20150415-iosxr Revision 1.0 For Public Release 2015 April 15 16:00 UTC (GMT) Summary ======= A vulnerability in the packet-processing code of Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation Services Routers (ASR) could allow an unauthenticated, remote attacker to cause a lockup and eventual reload of a network processor chip and the line card that is processing traffic. Only Typhoon-based line cards on Cisco ASR 9000 Series Aggregation Services Routers are affected by this vulnerability. The vulnerability is due to improper processing of packets that are routed via the bridge-group virtual interface (BVI) when any of the following features are configured: Unicast Reverse Path Forwarding (uRPF), policy-based routing (PBR), quality of service (QoS), or access control lists (ACLs). An attacker could exploit this vulnerability by sending IPv4 packets through an affected device that is configured to route them via the BVI interface. A successful exploit could allow the attacker to cause a lockup and eventual reload of a network processor chip and the line card that is processing traffic, leading to a denial of service (DoS) condition. Cisco has released free software updates that address this vulnerability. There are no workarounds to address this vulnerability. This advisory is available at the following link: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-s... -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.22 (Darwin) Comment: GPGTools - http://gpgtools.org iQIcBAEBAgAGBQJVLoaBAAoJEIpI1I6i1Mx3QxoP/0l8Z+HfJhF5ipb0CZT62TIS m6gBR5TnXtkQTSLPBqvGTALoKTpXIuY49YwRjkAYRmVMei+ercsf6llE8YSmYL3Q TjaGxxhp4v9dQo36IwuzhjY8oGiMHIrLuRwWt+b8OZos2d+wQAcP76nfKyWhnGhC rBwN/js1uxBkTWpxIru149xf76moe3+1v353kjVS+PUbm33Uwe1dfAS1uETZvN1N lIIYlyzwqzokl+KRFvPKq0Iyr/qLa2cHqtfcLOwAD2VuLwGboFcno1uOlf7uEt4Z Wb1T1tAHvEHVBMpmh2jcV6EgGw3igU5Azx2C/+YeNqFTAei4qbUYi9Jhg9vuvhO1 ED5w+GaXg58opiaYEvP4GAXJ6pcq2P39Nawncodz/rA2IM5bQyTRWzCflMMfivFC AR0/g500NvwyCWluXaDVpvcZMI/MNuw8nq4MaTp7e/opYAiJFMW/ru6YAAFZOTW3 yG0Iij+vObL977hGlSHxlbJfqusfHT9m1tvARUhqRnD+LJcymvGMY9bJnndGqFr1 MQowrdz2acEX4DYF6RJgjgYSUfpH7QZd2Dh7STxmOS1y+8oUBplcr8oD4qgl/NRk NJyyuN2lLywb+v0EJGwz1+QjCBOLRJ5y3CvYM9ZsPOWJJZASDmPa4EvVQSyXloBM 8aItCdd34k/4H7gj+gYy =nnUg -----END PGP SIGNATURE-----