Cisco Security Advisory
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AV:N/AC:L/Au:N/C:N/I:P/A:P/E:F/RL:OF/RC:C
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A vulnerability in the implementation of the punt policer on Trident line cards in Cisco ASR 9000 Series Aggregation Services Routers could allow an unauthenticated, remote attacker to overload the CPU on the Trident line card or route processor (RP) and eventually cause a denial of service (DoS) condition for traffic in some queues.
The vulnerability is due to a missing static punt policer for traffic that is destined to a device. An attacker could exploit this vulnerability by sending a large number of specific packets that are destined to an affected device. An exploit could allow the attacker to overload the CPU on the Trident line card or RP and eventually cause a DoS condition for traffic in some queues.
Cisco has confirmed the vulnerability in a security notice and released software updates.
To exploit this vulnerability, an attacker could send a large number of specific packets to be processed by the targeted device. Depending on the location of the device in the environment, the attacker may need access to trusted, internal networks behind a firewall to send specific packets to the device.
Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
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Customers are advised to consult Cisco bug ID CSCun83985 for a complete list of affected product versions.
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Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to have network access.
It is critical to prevent unauthorized direct communication to network devices. Restrict network traffic destined to the network infrastructure to protect against reconnaissance and denial of service attacks. For configuration details, see Protecting Your Core: Infrastructure Protection Access Control Lists.
Administrators are advised to monitor affected systems.
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Cisco customers with active contracts should contact their Cisco support team for assistance in upgrading to a software version that includes fixes for this vulnerability. Cisco customers without contracts may contact the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at tac@cisco.com for assistance.
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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.
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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.
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Show LessVersion Description Section Status Date 1.0 Initial Release NA Final 2014-Jul-08
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