Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2020.3646
Cisco Firepower 2100 Series SSL/TLS Inspection Denial of
Service Vulnerability
23 October 2020
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Firepower 2100 Series
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-3562
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-ssl-dcrpt-dos-RYEkX4yy
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco Firepower 2100 Series SSL/TLS Inspection Denial of Service Vulnerability
Priority: High
Advisory ID: cisco-sa-ftd-ssl-dcrpt-dos-RYEkX4yy
First Published: 2020 October 21 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvs56802
CVE-2020-3562
CWE-119
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 SSL/TLS inspection of Cisco Firepower Threat Defense
(FTD) Software for Cisco Firepower 2100 Series firewalls could allow an
unauthenticated, remote attacker to cause a denial of service (DoS)
condition on an affected device.
The vulnerability is due to improper input validation for certain fields of
specific SSL/TLS messages. An attacker could exploit this vulnerability by
sending a malformed SSL/TLS message through an affected device. A
successful exploit could allow the attacker to cause the affected device to
reload, resulting in a DoS condition. No manual intervention is needed to
recover the device after it has reloaded.
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-ssl-dcrpt-dos-RYEkX4yy
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 2100 Series firewalls if they
are running a vulnerable release of Cisco FTD Software and have the SSL/TLS
inspection feature enabled.
For information about which Cisco software releases are vulnerable, see the
Fixed Software section of this advisory.
Determine the Device Configuration
See the Firepower Management Center Configuration Guide for information
about configuring SSL/TLS inspection policies.
To determine whether SSL/TLS inspection is enabled, choose one of the
following options:
Option 1: Use the CLI
Use the show ssl-policy-config CLI command to determine whether SSL/TLS
inspection is enabled on a device. The following example shows the output
of the show ssl-policy-config command on a device that does not have an SSL
policy configured and is not vulnerable:
> show ssl-policy-config
SSL policy not yet applied.
Any other output returned by the show ssl-policy-config command indicates
that SSL/TLS inspection is configured and the device is vulnerable.
See the Cisco Firepower Threat Defense Command Reference for further
information about the show ssl-policy-config command.
Option 2: Use the GUI
To verify whether SSL/TLS inspection is enabled on a device, navigate
through the following menus:
For devices managed by Firepower Management Center (FMC) : Policies >
Access Control > SSL
For devices managed by Firepower Device Manager (FDM) : Policies > SSL
Decryption
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 that is running on any platform other than the platforms
that are listed in the Vulnerable Products section of this advisory
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 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.
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 Migrate to a fixed Migrate to a fixed release.
release.
6.4.0 Migrate to a fixed Migrate to a fixed release.
release.
6.5.0 Migrate to a fixed 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 Sanmith Prakash 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-ssl-dcrpt-dos-RYEkX4yy
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2020-OCT-21 |
+----------+---------------------------+----------+--------+--------------+
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
https://www.auscert.org.au/bulletins/
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967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=SRRa
-----END PGP SIGNATURE-----