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             AUSCERT External Security Bulletin Redistribution

      Cisco Firepower 4110 ICMP Flood Denial of Service Vulnerability
                              23 October 2020


        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: 

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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



CVSS Score:


  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:

    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


  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:

    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

    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

    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

    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 (future      Migrate to a fixed release.
    6.4.0             Migrate to a fixed release.
    6.5.0 (future      Migrate to a fixed 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

       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.


  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.


  o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/

Revision History

  o +----------+---------------------------+----------+--------+--------------+
    | Version  |        Description        | Section  | Status |     Date     |
    | 1.0      | Initial public release.   | -        | Final  | 2020-OCT-21  |

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