IntelliShield has updated this alert to correct naming of affected products.
Description
Cisco Adaptive Security Appliance Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on a targeted device.
The vulnerability is due to improper handling of ICMP error messages. An unauthenticated, remote attacker could exploit this vulnerability by sending malicious network packets to the device. If successful, the attacker could cause the device to reload, resulting in a DoS condition.
Cisco confirmed the vulnerability in a security advisory and released software updates.
Warning Indicators
Cisco Adaptive Security Appliance Software versions 8.4.1 and prior, 8.5, and 8.6 are vulnerable when running on Cisco Adaptive Security Appliance 5500 Series and Cisco Catalyst Series Adaptive Security Appliance Services Module devices.
IntelliShield Analysis
The vulnerability exists only on systems where IPv6 functionality has been enabled. This factor may decrease the potential for exploitation in some environments.
An unauthenticated, remote attacker could exploit this vulnerability to cause a DoS condition on a targeted device.
Technical Information
The vulnerability is due to improper handling of ICMP error messages by the affected software during processing of IPv6 packets.
An unauthenticated, remote attacker could exploit this vulnerability by sending a malicious IPv6 packet to the targeted device. The handling of an error message as a result of processing the malicious packet could cause the device to fail and reload, resulting in a DoS condition.
Safeguards
Administrators are advised to apply the appropriate updates.
Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.
Administrators may consider disabling logging of syslog message 110003.
Administrators are advised to monitor affected systems.
Patches/Software
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 e-mail at tac@cisco.com.
Alert History
Version 1, June 20, 2012, 12:13PM: Cisco Adaptive Security Appliance Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition on a targeted device. Updates are available.
The security vulnerability applies to the following combinations of products.
Primary Products:
Cisco
Cisco Adaptive Security Appliance (ASA) Software
8.4 .1, .1.11, .1.3, .2, .2.8, .3, .3.8, .3.9, .4, Base | 8.5 .1, .1.1, .1.6, .1.7, Base | 8.6 .1, .1.1, Base
Associated Products:
N/A
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