A vulnerability in function handling ICMP packets of Cisco ASA Software could allow an unauthenticated, remote attacker to cause a arbitrary connections to be cleared and a reload of the affected device, leading to a denial of service (DoS) condition.
The vulnerability is due to improper handling of crafted ICMP packets. An attacker could exploit this vulnerability by sending a number of crafted ICMP packets to or through an affected device. An exploit could allow the attacker to clear arbitrary connections on the firewall or cause a reload of the affected device, leading to a denial of service (DoS) condition.
Cisco has confirmed the vulnerability in a security advisory and released software updates.
Indicators of Compromise
Cisco Adaptive Security Appliance (ASA) Software versions prior to 8.4(7.2), 8.7(1.8), 9.0(3.6), and 9.1(2.8) are affected.
The vulnerability is due to improper processing of ICMP packets by Cisco ASA Software.
An unauthenticated, remote attacker could exploit the vulnerability by sending malicious ICMP packets to the device or traffic that could transit an interface on the device. The processing of the malicious ICMP packets could cause the device to reload, resulting in a DoS condition.
Because the vulnerability can be triggered via transit traffic, attackers may be able to exploit the vulnerability more easily.
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 are advised to monitor affected systems.
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 email at firstname.lastname@example.org.
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Cisco Multivendor Vulnerability Alerts respond to vulnerabilities identified in third-party vendors' products. These alerts contain information compiled from diverse sources and provide comprehensive technical descriptions, objective analytical assessments, workarounds and practical safeguards, and links to vendor advisories and patches.