Cisco Security Advisory
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AV:N/AC:L/Au:N/C:N/I:N/A:P/E:F/RL:OF/RC:C
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A vulnerability in IP version 6 (IPv6) processing in Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a reload of the ipv6_io service.
The vulnerability is due to improper processing of a malformed IPv6 packet by a device configured to process such packets. An attacker could exploit this vulnerability by sending a malformed IPv6 packet to be processed by a device that is configured for IPv6. An exploit could allow the attacker to cause a reload of the ipv6_io service.
Cisco has confirmed the vulnerability and released software updates.
To exploit this vulnerability, an attacker may need to acquire additional information about the targeted device, such as whether the device is configured to process IPv6 packets. A device configured to process IPv6 packets is required for a successful exploit.
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 CSCuq95565 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 can help protect affected systems from external attacks by using a solid firewall strategy.
Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.
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-17
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