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AUSCERT External Security Bulletin Redistribution
ESB-2023.6378
Cisco Firepower Threat Defense Software Snort 3 Detection
Engine Denial of Service Vulnerability
2 November 2023
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Firepower Threat Defense Software
Publisher: Cisco Systems
Operating System: Cisco
Resolution: Patch/Upgrade
CVE Names: CVE-2023-20070
Original Bulletin:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-snort3-uAnUntcV
Comment: CVSS (Max): 4.0 CVE-2023-20070 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:L)
CVSS Source: Cisco Systems
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:L
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Cisco Firepower Threat Defense Software Snort 3 Detection Engine Denial of
Service Vulnerability
Priority: Medium
Advisory ID: cisco-sa-ftd-snort3-uAnUntcV
First Published: 2023 November 1 16:00 GMT
Version 1.0: Final
Workarounds: Yes
Cisco Bug IDs: CSCwc59953
CVE Names: CVE-2023-20070
Summary
o A vulnerability in the TLS 1.3 implementation of the Cisco Firepower Threat
Defense (FTD) Software could allow an unauthenticated, remote attacker to
cause the Snort 3 detection engine to unexpectedly restart.
This vulnerability is due to a logic error in how memory allocations are
handled during a TLS 1.3 session. Under specific, time-based constraints,
an attacker could exploit this vulnerability by sending a crafted TLS 1.3
message sequence through an affected device. A successful exploit could
allow the attacker to cause the Snort 3 detection engine to reload,
resulting in a denial of service (DoS) condition. While the Snort detection
engine reloads, packets going through the FTD device that are sent to the
Snort detection engine will be dropped. The Snort detection engine will
restart automatically. No manual intervention is required.
Cisco has released software updates that address this vulnerability. There
are workarounds that address this vulnerability.
This advisory is available at the following link:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-snort3-uAnUntcV
This advisory is part of the November 2023 release of the Cisco ASA, FTD,
and FMC Security Advisory Bundled publication. For a complete list of the
advisories and links to them, see Cisco Event Response: November 2023
Semiannual Cisco ASA, FMC, and FTD Software Security Advisory Bundled
Publication .
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected devices that were
running a vulnerable release of Cisco FTD Software and for which both of
the following conditions were true:
The device was running Snort 3.
The device was using an SSL policy with TLS 1.3 decryption enabled.
For information about which Cisco software releases are vulnerable, see the
Fixed Software section of this advisory.
Determine Cisco FTD Software Snort Configuration
To determine if Snort 3 is running on Cisco FTD Software, see Determine the
Active Snort Version that Runs on Firepower Threat Defense (FTD) . Snort 3
has to be active for this vulnerability to be exploited.
Determine Cisco FTD Software SSL Policy Configuration
SSL decryption policies are not configured by default.
Determine Cisco FTD Software SSL Policy Configuration Using the FTD
Software CLI
To determine whether an SSL policy is configured on a device that is
running Cisco FTD Software, log in to the Cisco FTD Software CLI and use
the show ssl-policy-config command.
If the command output shows SSL policy not yet applied , the device is not
affected by this vulnerability, as shown in the following example:
>show ssl-policy-config
SSL policy not yet applied
If the command output shows a policy, the device has an SSL policy applied
and could be affected by this vulnerability if TLS 1.3 decryption is
enabled, as shown in the following example:
> show ssl-policy-config
===================[ CSCwc59953 ]===================
=================[ Default Action ]=================
Default Action : Do Not Decrypt
...
Determine Cisco FTD Software SSL Policy Configuration for Devices that Are
Managed by Cisco Firepower Device Manager Software
To determine whether an SSL policy is configured on a device that is
managed by Cisco Firepower Device Manager (FDM) Software, complete the
following steps:
1. Log in to the Cisco FTD Software web interface.
2. From the main menu, choose Policies .
3. Choose the SSL Decryption tab.
If SSL decryption is not enabled, the device is not affected by
this vulnerability.
If a Policy Name is listed, the device could be affected by this
vulnerability if TLS 1.3 Decryption is enabled.
For detailed information about SSL decryption policies, see the SSL
Decryption chapter of the Cisco Firepower Threat Defense Configuration
Guide for Firepower Device Manager .
Determine Cisco FTD Software SSL Policy Configuration for Devices that Are
Managed by Cisco Firepower Management Center Software
To determine whether an SSL policy is configured on a device that is
managed by Cisco Firepower Management Center (FMC) Software, complete the
following steps:
1. Log in to the Cisco FMC Software web interface.
2. From the Policies menu, choose Access Control .
3. Choose the appropriate Access Control Policy.
4. Click the Edit pencil icon.
5. Look in the SSL Policy area.
If None is listed, the device is not affected by this
vulnerability.
If a Policy Name is listed, the device could be affected by this
vulnerability if TLS 1.3 Decryption is enabled.
For detailed information about SSL decryption policies, see the SSL Policy
chapter of the Cisco Secure Firewall Management Center Configuration Guide
.
Determine Cisco FTD Software SSL Policy Configuration for Devices that Are
Managed by Cisco Defense Orchestrator
To determine whether an SSL policy is configured on a device that is
managed by Cisco Defense Orchestrator, complete the following steps:
1. Log in to the Cisco Defense Orchestrator web interface.
2. From the Cisco Defense Orchestrator Policies menu, choose the FTD
Policies .
3. From the FTD Policies menu, choose Access Control.
4. Choose the appropriate Access Control Policy.
5. Click the Edit pencil icon.
6. Look in the Decryption Policy area.
If None is listed, the device is not affected by this
vulnerability.
If a Policy Name is listed, the device could be affected by this
vulnerability if TLS 1.3 Decryption is enabled.
For detailed information about Cisco Defense Orchestrator managed devices,
see the Cisco Defense Orchestrator documentation.
For detailed information about SSL decryption policies for Cisco FMC
Devices managed with Cisco Defense Orchestrator, see the Decryption
Policies chapter of Managing Firewall Threat Defense with Cloud-delivered
Firewall Management Center in Cisco Defense Orchestrator .
For detailed information about SSL decryption policies for Cisco FDM
Devices managed with Cisco Defense Orchestrator, see the SSL Decryption
Policy section of the Managing FDM Devices with Cisco Defense Orchestrator
guide.
Determine Cisco FTD Software TLS 1.3 Decryption Configuration
The default setting for TLS 1.3 decryption varies by platform when an SSL
policy is configured. Note that TLS 1.3 decryption for Cisco FDM controlled
devices is not offered until Cisco FTD Release 7.3.0. TLS 1.3 decryption is
offered in Cisco FTD Release 7.2.0 for devices that are managed by Cisco
FMC and Cisco Defense Orchestrator.
These are the default settings for the platforms:
TLS 1.3 decryption is not enabled by default for devices managed by
Cisco FDM Software.
TLS 1.3 decryption is not enabled by default for devices managed by
Cisco FMC Software.
TLS 1.3 decryption is enabled by default for devices managed by Cisco
Discovery Orchestrator Software.
Determine Cisco FTD Software TLS 1.3 Decryption Configuration Using the FTD
Software CLI
To determine from the CLI whether TLS 1.3 decryption is configured on a
device, log in to the Cisco FTD Software CLI and use the grep tls13 /ngfw/
var/sf/detection_engines/*/ssl/ssl.rules command.
If the output of the command shows "tls13_decryption" "false" , the
device is not affected by this vulnerability.
If the output of the command shows nothing, the device is not affected
by this vulnerability.
If the output of command shows "tls13_decryption" "true" , the device
has an SSL policy applied and could be affected by this vulnerability
if TLS 1.3 Decryption is enabled, as shown in the following example:
> expert
admin@ftd:~$
admin@ftd:~$grep tls13 /ngfw/var/sf/detection_engines/*/ssl/ssl.rules
"tls13_decryption" "true";
Determine Cisco FTD Software TLS 1.3 Decryption Configuration for Devices
that Are Managed by Cisco FDM Software
To determine whether TLS 1.3 Decryption is configured on a device that is
managed by Cisco FDM Software, complete the following steps:
1. Log in to the Cisco FTD Software web interface.
2. From the main menu, choose Policies .
3. Choose the SSL Decryption tab.
4. Click the SSL Decryption Settings button.
5. Click on the Advanced tab.
If the TLS 1.3 Decryption slider is not enabled, the device is not
affected by this vulnerability.
If the TLS 1.3 TLS 1.3 Decryption slider is enabled, the device is
affected by this vulnerability.
For detailed information about TLS 1.3 decryption, see the Configure
Advanced and Undecryptable Traffic Settings section in the Cisco Firepower
Threat Defense Configuration Guide for Firepower Device Manager.
Determine Cisco FTD Software TLS 1.3 Decryption Configuration for Devices
that Are Managed by Cisco FMC Software
To determine whether TLS 1.3 Decryption is configured on a device that is
managed by Cisco FMC Software, complete the following steps:
1. Log in to the Cisco FMC Software web interface.
2. From the Policies menu, choose SSL .
3. Choose the appropriate SSL Policy.
4. Click the Edit pencil icon.
5. Click the Advanced Settings tab.
If the Enable TLS 1.3 Decryption box is not checked, the device is
not affected by this vulnerability.
If the Enable TLS 1.3 Decryption box is checked, the device is
affected by this vulnerability.
For detailed information about TLS 1.3 decryption, see the SSL Policy
Advanced Options section in the Cisco Secure Firewall Management Center
Configuration Guide.
Determine Cisco FTD Software TLS 1.3 Decryption Configuration for Devices
that Are Managed by Cisco Defense Orchestrator Software
To determine whether TLS 1.3 Decryption is configured on a device that is
managed by Cisco Defense Orchestrator, complete the following steps:
1. Log in to the Cisco Defense Orchestrator web interface.
2. From the Cisco Defense Orchestrator Policies menu, choose FTD Policies.
3. From the FTD Policies menu, choose Decryption .
4. Choose the appropriate Decryption Policy.
5. Click the Edit pencil icon.
6. Click the Advanced Settings tab.
If Enable TLS 1.3 Decryption is not enabled, the device is not
affected by this vulnerability.
If Enable TLS 1.3 Decryption is enabled, the device is affected by
this vulnerability.
For detailed information about devices that are managed by Cisco Defense
Orchestrator, see the Cisco Defense Orchestrator documentation.
For detailed information about TLS 1.3 decryption, see the Decryption
Policy Advanced Options section of Managing Firewall Threat Defense with
Cloud-Delivered Firewall Management Center in Cisco Defense Orchestrator .
For detailed information about TLS 1.3 decryption for Cisco FDM Devices
managed with Cisco Defense Orchestrator, see the SSL Decryption Policy
section of Managing FDM Devices with Cisco Defense Orchestrator .
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
products:
Cisco Adaptive Security Appliance (ASA) Software
Cisco FMC Software
Open Source Snort 2
Open Source Snort 3
Workarounds
o There are workarounds and mitigations that address this vulnerability. To
remove the attack vector for this vulnerability, either of the following
two options can be used. Only one of the two options needs to be applied.
Revert to Snort 2
Disable TLS 1.3 Decryption
Reverting to Snort 2
Before downgrading, review the Before you Begin section in the Switching
Between Snort 2 and Snort 3 section in the Cisco Firepower Threat Defense
Configuration Guide for Firepower Device Manager.
Note: Downgrading to Snort 2 will delete customer policies, NAP
customizations, and Hostname redirect in active authentications. To discuss
the effects of reverting on your deployment, contact the Technical
Assistance Center (TAC) .
Reverting to Snort 2 for Cisco FTD devices managed by FDM Software
To revert to Snort 2 on a device that is managed by Cisco FDM Software,
complete the following steps:
1. Log in to the Cisco FTD Software web interface.
2. From the main menu, choose Device .
3. In the Updates area, choose View Configuration .
4. In the Intrusion Rule section, choose Downgrade to 2.0.
After making the changes above, deploy changes to your Cisco FTD devices.
For detailed information about reverting to Snort 2, see the Switching
Between Snort 2 and Snort 3 section in the Cisco Firepower Threat Defense
Configuration Guide for Firepower Device Manager .
Reverting to Snort 2 for Cisco FTD devices managed by FMC Software
To revert to Snort 2 on a device that is managed by Cisco FMC Software,
complete the following steps:
1. Log in to the Cisco FMC Software web interface.
2. From the Devices menu, choose Device Management .
3. Choose the appropriate Cisco FTD device.
4. Click the Edit pencil icon.
5. Choose the Device tab.
6. In the Inspection Engine area, choose Revert to Snort 2 .
After making the changes above, deploy changes to your FTD devices.
For detailed information about reverting to Snort 2, see the Snort 3
Inspection Engine chapter of the Cisco Secure Firewall Management Center
Snort 3 Configuration Guide.
Reverting to Snort 2 for Cisco FTD devices managed by Cisco Defense
Orchestrator
To revert to Snort 2 on a device that is managed by Cisco Defense
Orchestrator, complete the following steps:
1. Log in to the Cisco Defense Orchestrator web interface.
2. In the navigation bar, click Inventory.
3. Click the Devices tab.
4. Click the FTD tab and click the device you want to revert.
5. In the Device Actions pane located to the right, click Upgrade .
6. Set the upgrade toggle to Intrusion Prevention Engine.
7. Click Revert to Snort Engine 2.0.
After making the changes above, deploy changes to your Cisco FTD devices.
For detailed information about Cisco Defense Orchestrator managed devices,
see the Cisco Defense Orchestrator documentation.
For detailed information about reverting to Snort 2 for Cisco FMC Devices
managed with Cisco Defense Orchestrator, see the Snort 3 Inspection Engine
chapter of the Cisco Secure Firewall Management Center Snort 3
Configuration Guide.
For detailed information about reverting to Snort 2 for Cisco FDM Devices
managed with Cisco Defense Orchestrator, see the Revert From Snort 3.0 for
FDM-Managed Device section of the Managing FDM Devices with Cisco Defense
Orchestrator guide.
Disabling TLS 1.3 Decryption
This mitigation can affect your client and server connections. When TLS 1.3
decryption is disabled, the TLS connection downgrades to TLS 1.2 while
matching the decryption rule. The effects on the deployment will depend on
the clients and servers that will connect through the Cisco FTD device. To
discuss the effects this will have on your deployment, contact the
Technical Assistance Center (TAC) .
Disabling TLS 1.3 for Cisco FTD Software devices managed by FDM Software
To disable TLS 1.3 Decryption on a device that is managed by Cisco FDM
Software, complete the following steps:
1. Log in to the Cisco FTD Software web interface.
2. From the main menu, choose Policies .
3. Choose the SSL Decryption tab.
4. Click the SSL Decryption Settings button.
5. Click on the Advanced tab.
6. Disable the TLS 1.3 Decryption setting.
7. Click OK.
After changing the policy above, deploy the new policy to your Cisco FTD
devices.
For detailed information about TLS 1.3 decryption, see the Configure
Advanced and Undecryptable Traffic Settings section in the Cisco Firepower
Threat Defense Configuration Guide for Firepower Device Manager.
Disabling TLS 1.3 for Cisco FTD Software devices managed by FMC Software
To disable TLS 1.3 Decryption on a device that is managed by Cisco FMC
Software, complete the following steps:
1. Log in to the Cisco FMC Software web interface.
2. From the Policies menu, choose SSL .
3. Choose the appropriate SSL Policy.
4. Click the Edit pencil icon.
5. Click the Advanced Settings tab.
6. Uncheck the Enable TLS 1.3 Decryption box.
7. Click Save to save your changes.
After changing the policy above, deploy the new policy to your FTD devices.
For detailed information about TLS 1.3 decryption, see the SSL Policy
Advanced Options section in the Cisco Secure Firewall Management Center
Configuration Guide.
Disabling TLS 1.3 for Cisco FTD Software devices managed by Cisco Defense
Orchestrator
To disable TLS 1.3 Decryption on a device that is managed by Cisco Defense
Orchestrator, complete the following steps:
1. Log in to the Cisco Defense Orchestrator web interface.
2. From the Cisco Defense Orchestrator Policies menu, choose FTD Policies.
3. From the FTD Policies menu, choose Decryption .
4. Choose the appropriate Decryption Policy.
5. Click the Edit pencil icon.
6. Click the Advanced Settings tab.
7. Disable Enable TLS 1.3 Decryption .
8. Click Save .
After changing the policy above, deploy the new policy to your FTD devices.
For detailed information about devices managed by Cisco Defense
Orchestrator, see the Cisco Defense Orchestrator documentation.
For detailed information about TLS 1.3 decryption, see the Decryption
Policy Advanced Options section of Managing Firewall Threat Defense with
Cloud-Delivered Firewall Management Center in Cisco Defense Orchestrator .
For detailed information about TLS 1.3 decryption for Cisco FDM Devices
managed with Cisco Defense Orchestrator, see the SSL Decryption Policy
section of Managing FDM Devices with Cisco Defense Orchestrator .
While these workarounds and mitigations have been deployed and were proven
successful in a test environment, customers should determine the
applicability and effectiveness in their own environment and under their
own use conditions. Customers should be aware that any workaround or
mitigation that is implemented may negatively impact the functionality or
performance of their network based on intrinsic customer deployment
scenarios and limitations. Customers should not deploy any workarounds or
mitigations before first evaluating the applicability to their own
environment and any impact to such environment.
Fixed Software
o 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.
Cisco ASA, FMC, and FTD Software
To help customers determine their exposure to vulnerabilities in Cisco ASA,
FMC, and FTD Software, Cisco provides the Cisco Software Checker . This
tool identifies any Cisco security advisories that impact a specific
software release and the earliest release that fixes the vulnerabilities
that are described in each advisory ("First Fixed"). If applicable, the
tool also returns the earliest release that fixes all the vulnerabilities
that are described in all the advisories that the Software Checker
identifies ("Combined First Fixed").
To use the tool, go to the Cisco Software Checker page and follow the
instructions. Alternatively, use the following form to search for
vulnerabilities that affect a specific software release. To use the form,
follow these steps:
1. Choose which advisories the tool will search-all advisories, only
advisories with a Critical or High Security Impact Rating (SIR) , or
only this advisory.
2. Choose the appropriate software.
3. Choose the appropriate platform.
4. Enter a release number-for example, 9.16.2.11 for Cisco ASA Software or
6.6.7 for Cisco FTD Software.
5. Click Check .
[2 ] [ ] [Critical,High,Medium]
[Only this advisory ] [Cisco ASA Software]
[Any Platform ]
[ ] [Check]
Additional Resources
For help determining the best Cisco ASA, FTD, or FMC Software release, see
the following Recommended Releases documents. If a security advisory
recommends a later release, Cisco recommends following the advisory
guidance.
Cisco ASA Compatibility
Cisco Secure Firewall ASA Upgrade Guide
Cisco Secure Firewall Threat Defense Compatibility Guide
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 during the resolution of a Cisco TAC support
case.
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.
Subscribe to Cisco Security Notifications
o Subscribe
Related to This Advisory
o Cisco Event Response: November 2023 Cisco ASA, FMC, and FTD Software
Security Advisory Bundled Publication
URL
o https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-snort3-uAnUntcV
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2023-NOV-01 |
+----------+---------------------------+----------+--------+--------------+
Legal Disclaimer
o THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND
OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT
OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES
THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
A standalone copy or paraphrase of the text of this document that omits the
distribution URL is an uncontrolled copy and may lack important information
or contain factual errors. The information in this document is intended for
end users of Cisco products.
- --------------------------END INCLUDED TEXT--------------------
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