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AUSCERT External Security Bulletin Redistribution
Cisco Firepower Management Center Lightweight Directory
Access Protocol Authentication Bypass Vulnerability
24 January 2020
AusCERT Security Bulletin Summary
Product: Cisco Firepower Management Center (FMC)
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2019-16028
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Cisco Firepower Management Center Lightweight Directory Access Protocol
Authentication Bypass Vulnerability
Advisory ID: cisco-sa-20200122-fmc-auth
First Published: 2020 January 22 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds availableCisco Bug IDs: CSCvr95287
o A vulnerability in the web-based management interface of Cisco Firepower
Management Center (FMC) could allow an unauthenticated, remote attacker to
bypass authentication and execute arbitrary actions with administrative
privileges on an affected device.
The vulnerability is due to improper handling of Lightweight Directory
Access Protocol (LDAP) authentication responses from an external
authentication server. An attacker could exploit this vulnerability by
sending crafted HTTP requests to an affected device. A successful exploit
could allow the attacker to gain administrative access to the web-based
management interface of the affected device.
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:
o Vulnerable Products
This vulnerability affects Cisco FMC Software if it is configured to
authenticate users of the web-based management interface through an
external LDAP server.
For information about which Cisco FMC Software releases are vulnerable, see
the Fixed Software section of this advisory.
Determine Whether External Authentication Through LDAP Is Enabled
To determine whether external authentication using an LDAP server is
configured on the device, administrators can navigate to System > Users >
External Authentication and look for an External Authentication Object that
uses LDAP as the authentication method. The External Authentication Object
must be enabled for the FMC to be affected.
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 Adaptive
Security Appliance (ASA) Software or Cisco Firepower Threat Defense (FTD)
o There are no workarounds that address this vulnerability. However,
customers who cannot immediately apply a software fix may evaluate the
possibility of disabling LDAP authentication for FMC access and using other
authentication methods until a software fix can be applied.
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
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 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
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:
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
In the following table, the left column lists releases of Cisco FMC
Software. 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 hotfix patch is available for an affected release.
Cisco First Hotfix Patch
than to a Not available.
6.1.0 ^1 fixed
6.1.0 to a Sourcefire_3D_Defense_Center_S3_Hotfix_ES-22.214.171.124-2.sh
6.2.0 ^2 to a Not available.
6.2.1 ^2 to a Not available.
6.2.2 ^2 to a Not available.
6.2.3 (February Sourcefire_3D_Defense_Center_S3_Hotfix_DO-126.96.36.199-3.sh.REL.tar
6.3.0 (May Cisco_Firepower_Mgmt_Center_Hotfix_AI-188.8.131.52-2.sh.REL.tar
6.4.0 184.108.40.206 releases 220.127.116.11 and later)
releases 18.104.22.168 and earlier)
6.5.0 22.214.171.124 ^ Not available.
1. Cisco FMC 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.
2. Customers who are running a 6.2.0, 6.2.1, or 6.2.2 release should
migrate either to a release that integrates the fix or to a release for
which a hotfix patch is available. For example, customers could migrate to
Release 6.2.3 and then install the hotfix patch, which is
3. Cisco FMC Software Release 126.96.36.199 integrates a fix for this
vulnerability; however, it is no longer available for download.
Customers who are running the following Cisco FMC Software releases can
remediate by doing the following:
Releases earlier than 6.1.0: Migrate to a 6.2.3 release and apply
6.1.0: Apply the hotfix listed in the preceding table or migrate to a
6.2.3 release and apply available hotfix.
6.2.0 through 6.2.2: Migrate to a 6.2.3 release and apply available
6.2.3 or 6.3.0: Apply available hotfixes; maintenance releases will be
available later this year.
6.4.0: Apply available hotfixes or upgrade to Release 188.8.131.52.
6.5.0: Upgrade to 184.108.40.206.
Customers may install a fix either by upgrading to a fixed release or by
installing a hotfix patch. The availability of each option for all the
supported software releases is documented in the preceding table.
To upgrade to a release that includes a fix for this vulnerability or to
install a hotfix patch, customers are advised to follow the Cisco Firepower
Management Center Upgrade Guide and then review the appropriate release
notes or, if applicable, review the Firepower Hotfix Release Notes .
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 Cisco would like to thank Michael J. Venema of Family Care Network and
Johan Anderstrom of QLS for independently reporting this vulnerability.
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.
| Version | Description | Section | Status | Date |
| 1.0 | Initial public release. | - | Final | 2020-January-22 |
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