Cisco Security Advisory
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AV:A/AC:L/Au:N/C:N/I:N/A:C/E:F/RL:OF/RC:C
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A vulnerability in the DHCP code of Cisco ASA Software could allow an unauthenticated, adjacent attacker to cause the reload of an affected system.
The vulnerability is due to insufficient validation of crafted or malformed DHCP version 6 (DHCPv6) packets when DHCPv6 replay feature is enabled. An attacker could exploit this vulnerability by sending a crafted DHCPv6 packet to the affected system.
Cisco has confirmed the vulnerability in a security notice and released software updates.
Although an attacker does not need to authenticate to a targeted device to exploit this vulnerability, the attacker must have access to the same broadcast or collision domain of the device. This access requirement decreases 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.
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Customers are advised to consult Cisco bug ID CSCun45520 for a complete list of affected product versions.
Vulnerable Products
At the time this alert was first published, Cisco ASA Software versions 9.1.5 and prior were vulnerable. Later releases of Cisco ASA Software 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-29
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