A vulnerability in parsing crafted Multiprotocol Label Switching (MPLS) packets 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 chip and a line card processing traffic. The vulnerability is due to insufficient logic in parsing MPLS packets. An attacker could exploit this vulnerability by sending a stream of crafted MPLS packets to be routed by a bridge-group virtual interface (BVI) on the affected device. An exploit could allow the attacker to cause a lockup and eventual reload of a network processor 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 collision or broadcast domain of the targeted device in order to send crafted MPLS packets to the device. This access requirement may reduce the likelihood of a successful exploit. 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-15 |
THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
A stand-alone copy or paraphrase of the text of this document that omits the distribution URL is an uncontrolled copy, and may lack important information or contain factual errors. The information in this document is intended for end-users of Cisco products.
Vulmon