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 the DHCPv6 server module of Cisco Network Registrar could allow an unauthenticated, remote attacker to cause a reload of the DHCPv6 server on an affected device.
The vulnerability is due to the way certain malformed requests are processed. An attacker could exploit this vulnerability by sending a malformed DHCPv6 packet to an affected device. A successful exploit could allow the attacker to cause a reload of the DHCPv6 server, which could result in a denial of service condition.
Cisco has confirmed the vulnerability in a security notice and released software updates.
To exploit this vulnerability, an attacker may need access to trusted, internal networks to send malformed DHCPv6 packets to a targeted device. This access requirement decreases the possibility 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.
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Customers are advised to consult Cisco bug ID CSCuo07437 for a complete list of affected product versions.
Vulnerable Products
At the time this alert was first published, Cisco CNS Network Registrar version 7.1 was vulnerable. Later releases of Cisco CNS Network Registrar may also be vulnerable.Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by these vulnerabilities.
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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 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-Apr-18
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