Cisco Security Advisory
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AV:N/AC:L/Au:N/C:P/I:N/A:N/E:F/RL:OF/RC:C
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A vulnerability in the processing of IP Detail Record (IPDR) packets on Cisco uBR10000 devices could allow an unauthenticated, remote attacker to gather a limited amount of IPDR data from the affected device.
The vulnerability is due to the inability of Cisco Cable Modem Termination Systems (CMTS) to define access control lists (ACLs) specific to the IPDR service to block unauthorized users. An attacker could exploit this vulnerability by sending crafted IPDR packets requesting that a limited amount of information from an affected CMTS is exported back to the attacker's IP address. A successful exploit could allow the attacker to gather a limited amount of IPDR data from the affected device.
Cisco has confirmed the vulnerability and released software updates.
To exploit this vulnerability, the attacker must send crafted IPDR packets to the targeted system, making exploitation more difficult in environments that restrict network access from untrusted sources.
Only MAC addresses on devices behind the CMTS device and a total number of bytes can be gathered from a CMTS device. A successful exploit does not provide an attacker with any information that maps MAC addresses to user ID information.
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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Cisco has released bug ID CSCua39203 for registered users, which contains additional details and an up-to-date 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.
Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.
Administrators may consider setting ACLs on adjacent devices to block access to TCP port 4737 on a CMTS device from untrusted networks.
Administrators are advised to monitor affected systems.
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Cisco customers with active contracts can obtain updates through the Software Center at the following link: Cisco. Cisco customers without contracts can obtain upgrades by contacting the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at tac@cisco.com.
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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 2015-Jun-19
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