Cisco Security Advisory
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AV:N/AC:H/Au:N/C:N/I:N/A:C/E:F/RL:OF/RC:C
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A vulnerability in the inspection and filter features of the Cisco Adaptive Security Appliance (ASA) could allow an unauthenticated, remote attacker to cause the affected system to reload.
The vulnerability is due to an internal traffic loop condition that can be triggered when a received packet is matched for both filtering and inspection due to a configuration with overlapping traffic matching criteria (configuration is not supported). An attacker could exploit this vulnerability by sending a packet that would be matched by the incorrect configuration. An exploit could allow the attacker to trigger an affected system to crash, resulting in a denial of service (DoS) condition.
Cisco has confirmed the vulnerability in a security notice and released software updates.
To exploit this vulnerability, an attacker must know whether a targeted device has both filtering and inspection features enabled. Due to the additional required information, this may reduce the likelihood of a successful exploit.
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Customers are advised to consult Cisco bug ID CSCui45606 for the most complete list of affected product versions.
Vulnerable Products
At the time this alert was first published, Cisco ASA Software Release 8.4(.6) 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 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-Jul-11
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