Cisco Security Advisory
Cisco Firepower 2100 Series Security Appliances ARP Denial of Service Vulnerability
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CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X
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A vulnerability in the ARP packet processing of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software for Cisco Firepower 2100 Series Security Appliances could allow an unauthenticated, adjacent attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition on an affected device.
The vulnerability is due to incorrect processing of ARP packets received by the management interface of an affected device. An attacker could exploit this vulnerability by sending a series of unicast ARP packets in a short timeframe that would reach the management interface of an affected device. A successful exploit could allow the attacker to consume resources on an affected device, which would prevent the device from sending internal system keepalives and eventually cause the device to reload, resulting in a denial of service (DoS) condition.
Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.
This advisory is available at the following link:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fp2100-arp-dos-kLdCK8ks
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Vulnerable Products
At the time of publication, this vulnerability affected Cisco Adaptive Security Appliance (ASA) Software releases earlier than releases 9.10.1.37, 9.12.3, and 9.13.1.2, if the software is running on a Cisco Firepower 2100 Series Security Appliance.
At the time of publication, this vulnerability affected Cisco Firepower Threat Defense (FTD) Software releases earlier than Release 6.6.0, if the software is running on a Cisco Firepower 2100 Series Security Appliance.
See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect Cisco FTD Software running on Cisco Adaptive Security Appliances and Cisco Integrated Services Routers.
Cisco has confirmed that this vulnerability does not affect Cisco Firepower Management Center (FMC) Software.
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This vulnerability can be only be exploited on the Cisco Firepower 2100 Series Security Appliances management interface and the attacker would need to have L2 adjacency, which greatly decreases the attack surface. This is why the Security Impact Rating is Medium.
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There are no workarounds that address this vulnerability.
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When considering software upgrades, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories and Alerts page, to determine exposure and a complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.
Fixed Releases
At the time of publication, Cisco ASA Software releases 9.10.1.37, 9.12.3, 9.13.1.2, and later contained the fix for this vulnerability.
At the time of publication, Cisco FTD Software 6.4.0.9 (May 2020), 6.5.0.5 (future release), 6.6.0 and later contained the fix for this vulnerability.1
See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information.
1. Cisco FMC and FTD Software releases 6.0.1 and earlier have reached end of software maintenance. Customers are advised to migrate to a supported release that includes the fix for this vulnerability.
To upgrade to a fixed release of Cisco FTD Software, customers can do one of the following:
- For devices that are managed by using Cisco Firepower Management Center (FMC), use the FMC interface to install the upgrade. After installation is complete, reapply the access control policy.
- For devices that are managed by using Cisco Firepower Device Manager (FDM), use the FDM interface to install the upgrade. After installation is complete, reapply the access control policy.
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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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This vulnerability was found during the resolution of a Cisco TAC support case.
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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 1.1 Clarified that only Firepower 2100 Series Security Appliances are affected. Vulnerable Products Final 2020-MAY-11 1.0 Initial public release. - Final 2020-MAY-06
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