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AUSCERT External Security Bulletin Redistribution
ESB-2020.3647
Cisco Firepower 4110 ICMP Flood Denial of Service Vulnerability
23 October 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Firepower 4110
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-3571
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-icmp-dos-hxxcycM
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Cisco Firepower 4110 ICMP Flood Denial of Service Vulnerability
Priority: High
Advisory ID: cisco-sa-ftd-icmp-dos-hxxcycM
First Published: 2020 October 21 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvt09940
CVE-2020-3571
CWE-400
CVSS Score:
8.6 AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X
Summary
o A vulnerability in the ICMP ingress packet processing of Cisco Firepower
Threat Defense (FTD) Software for Cisco Firepower 4110 appliances could
allow an unauthenticated, remote attacker to cause a denial of service
(DoS) condition on an affected device.
The vulnerability is due to incomplete input validation upon receiving ICMP
packets. An attacker could exploit this vulnerability by sending a high
number of crafted ICMP or ICMPv6 packets to an affected device. A
successful exploit could allow the attacker to cause a memory exhaustion
condition that may result in an unexpected reload. No manual intervention
is needed to recover the device after the reload.
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://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-ftd-icmp-dos-hxxcycM
This advisory is part of the October 2020 Cisco ASA, FMC, and FTD Software
Security Advisory Bundled Publication, which includes 17 Cisco Security
Advisories that describe 17 vulnerabilities. For a complete list of the
advisories and links to them, see Cisco Event Response: October 2020 Cisco
ASA, FMC, and FTD Software Security Advisory Bundled Publication .
Affected Products
o Vulnerable Products
This vulnerability affects Cisco Firepower 4110 appliances if they are
running an affected release of Cisco FTD Software.
For information about which Cisco software releases are vulnerable, see the
Fixed Software section of this advisory.
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 the following
Cisco products:
Adaptive Security Appliance (ASA) Software
Firepower Management Center (FMC) Software
FTD Software running on any platform other than the platforms listed in
the Vulnerable Products section of this advisory
FTD Software running on other 4100 Series appliances
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o Cisco has released free software updates that address the vulnerability
described in this advisory. Customers may only install and expect support
for software versions and feature sets for which they have purchased a
license. By installing, downloading, accessing, or otherwise using such
software upgrades, customers agree to follow the terms of the Cisco
software license:
https://www.cisco.com/c/en/us/products/end-user-license-agreement.html
Additionally, customers may only download software for which they have a
valid license, procured from Cisco directly, or through a Cisco authorized
reseller or partner. In most cases this will be a maintenance upgrade to
software that was previously purchased. Free security software updates do
not entitle customers to a new software license, additional software
feature sets, or major revision upgrades.
When considering software upgrades , customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories 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.
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service
contract and customers who make purchases through third-party vendors but
are unsuccessful in obtaining fixed software through their point of sale
should obtain upgrades by contacting the Cisco TAC: https://www.cisco.com/c
/en/us/support/web/tsd-cisco-worldwide-contacts.html
Customers should have the product serial number available and be prepared
to provide the URL of this advisory as evidence of entitlement to a free
upgrade.
Fixed Releases
In the following table(s), the left column lists Cisco software releases.
The center column indicates whether a release is affected by the
vulnerability described in this advisory and the first release that
includes the fix for this vulnerability. The right column indicates whether
a release is affected by any of the vulnerabilities described in this
bundle and which release includes fixes for those vulnerabilities.
Cisco FTD Software
Cisco FTD First Fixed Release First Fixed Release for All
Software for this Vulnerabilities Described in the Bundle
Release Vulnerability of Advisories
Earlier than Not vulnerable. Migrate to a fixed release.
6.2.2 ^1
6.2.2 Not vulnerable. Migrate to a fixed release.
6.2.3 Not vulnerable. Migrate to a fixed release.
6.3.0 6.3.0.6 (future Migrate to a fixed release.
release)
6.4.0 6.4.0.10 Migrate to a fixed release.
6.5.0 6.5.0.5 (future Migrate to a fixed release.
release)
6.6.0 Not vulnerable. 6.6.1
1. Cisco FMC and FTD Software releases 6.0.1 and earlier, as well as
releases 6.2.0 and 6.2.1, 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, 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.
Exploitation and Public Announcements
o 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.
Source
o This vulnerability was found by Santosh Krishnamurthy of Cisco during
internal security testing.
Cisco Security Vulnerability Policy
o 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.
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-ftd-icmp-dos-hxxcycM
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2020-OCT-21 |
+----------+---------------------------+----------+--------+--------------+
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