Cisco Security Advisory
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AV:A/AC:H/Au:N/C:N/I:N/A:C/E:F/RL:OF/RC:C
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A vulnerability in the DHCP subsystem of Cisco Aironet access points could allow an unauthenticated, adjacent attacker to create a denial of service condition.
The vulnerability is due to an error condition that may occur when very short DHCP leases are in use. If an attacker can prevent the access point from renewing its lease, the device may restart after unsuccessful DHCP Renew attempts in an effort to reestablish network connectivity. The expected behavior is that the network interface would restart but not the device.
This vulnerability was reported to Cisco by Maxim Salomon and Timo Warns of Airbus Operations GmbH.
Cisco has confirmed the vulnerability in a security notice and released software updates.
To exploit this vulnerability, an attacker must be on the same collision or broadcast domain as the targeted device. This access requirement may reduce the possibility of successful exploit attempts.
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 CSCtn16281 for the most complete list of affected product versions.
Vulnerable Products
At the time this alert was first published, Cisco Aironet running on Cisco IOS Software version 12.4(25d)JA was vulnerable. Later releases of Cisco IOS 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 are advised to allow only privileged users to access administration or management systems.
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-Nov-17
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