Test ID:	1.3.6.1.4.1.25623.1.0.105688
Category:	CISCO
Title:	Cisco IOS XR Software BVI Routed Packet Denial of Service Vulnerability
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 software updates that address this vulnerability. There are no workarounds to address this vulnerability.
Description:	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 software updates that address this vulnerability. There are no workarounds to address this vulnerability. Solution: See the referenced vendor advisory for a solution. CVSS Score: 7.8 CVSS Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C
Cross-Ref:	Common Vulnerability Exposure (CVE) ID: CVE-2015-0695 BugTraq ID: 74162 http://www.securityfocus.com/bid/74162 Cisco Security Advisory: 20150415 Cisco IOS XR Software BVI Routed Packet Denial of Service Vulnerability http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20150415-iosxr http://www.securitytracker.com/id/1032139
Copyright	This script is Copyright (C) 2016 Greenbone Networks GmbH

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