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AUSCERT External Security Bulletin Redistribution
ESB-2023.6386
Multiple Cisco Products Snort FTP Inspection Bypass Vulnerability
2 November 2023
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Open Source Snort 2 and 3
FirePOWER Services and Firepower Threat Defense Products
Cisco IOS XE Products
Cisco Meraki Products
Cyber Vision
Umbrella Secure Internet Gateway
Publisher: Cisco Systems
Operating System: Cisco
Resolution: Patch/Upgrade
CVE Names: CVE-2023-20071
Original Bulletin:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort-ftd-zXYtnjOM
Comment: CVSS (Max): 5.8 CVE-2023-20071 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N)
CVSS Source: Cisco Systems
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
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Multiple Cisco Products Snort FTP Inspection Bypass Vulnerability
Priority: Medium
Advisory ID: cisco-sa-snort-ftd-zXYtnjOM
First Published: 2023 November 1 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCwb69096 CSCwd09631 CSCwd83613 CSCwe02137 CSCwe57521
CVE Names: CVE-2023-20071
Summary
o Multiple Cisco products are affected by a vulnerability in the Snort
detection engine that could allow an unauthenticated, remote attacker to
bypass the configured policies on an affected system.
This vulnerability is due to a flaw in the FTP module of the Snort
detection engine. An attacker could exploit this vulnerability by sending
crafted FTP traffic through an affected device. A successful exploit could
allow the attacker to bypass FTP inspection and deliver a malicious
payload.
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://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort-ftd-zXYtnjOM
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
For information about which products were vulnerable at the time of
publication, see the following sections.
Impact to Open Source Snort
At the time of publication, this vulnerability affected Open Source Snort 2
and Open Source Snort 3.
For information about which Snort releases are vulnerable, see the Fixed
Software section of this advisory. For more information on Snort, see the
Snort website .
Impact to Cisco FirePOWER Services and Firepower Threat Defense Products
At the time of publication, this vulnerability affected the following Cisco
products if they were running a vulnerable release of Cisco software:
FirePOWER Services - All platforms
Firepower Threat Defense (FTD) Software - All platforms
For information about which Cisco software releases are vulnerable, see the
Fixed Software section of this advisory.
Impact to Cisco IOS XE Products
At the time of publication, this vulnerability affected the following Cisco
products if they were running a release earlier than the first fixed
release of Cisco Unified Threat Defense (UTD) Snort Intrusion Prevention
System (IPS) Engine for Cisco IOS XE Software or Cisco UTD Engine for Cisco
IOS XE SD-WAN Software:
1000 Series Integrated Services Routers (ISRs)
4000 Series Integrated Services Routers (ISRs)
Catalyst 8000V Edge Software
Catalyst 8200 Series Edge Platforms
Catalyst 8300 Series Edge Platforms
Catalyst 8500L Series Edge Platform
Cloud Services Routers 1000V Series
Integrated Services Virtual Router (ISRv)
Note: UTD is not installed on these devices by default. If the UTD file is
not installed, the device is not vulnerable.
For information about which Cisco software releases are vulnerable, see the
Fixed Software section of this advisory.
Determine Whether UTD Is Enabled
To determine whether UTD is enabled on a device, issue the show utd engine
standard status command and check for a Yes under Running . If there is no
output, the device is not affected. The following output example shows a
device that has UTD enabled:
Router# show utd engine standard status
Engine version : 1.0.19_SV2.9.16.1_XE17.3
Profile : Cloud-Low
System memory :
Usage : 6.00 %
Status : Green
Number of engines : 1
Engine Running Health Reason
===========================================
Engine(#1): Yes Green None
=======================================================
.
.
.
Impact to Cisco Meraki Products
At the time of publication, this vulnerability affected the following Cisco
products if they were running a vulnerable release of Cisco software:
Meraki MX64 and MX64W Appliances
Meraki MX65 and MX65W Appliances
Meraki MX67, MX67C and MX67W Appliances
Meraki MX68, MX68W and MX68WC Appliances
Meraki MX75 Appliances
Meraki MX84 Appliances
Meraki MX85 Appliances
Meraki MX95 Appliances
Meraki MX100 Appliances
Meraki MX105 Appliances
Meraki MX250 Appliances
Meraki MX400 Appliances
Meraki MX450 Appliances
Meraki MX600 Appliances
For information about which Cisco software releases are vulnerable, see the
Fixed Software section of this advisory.
Impact to Other Cisco Products
At the time of publication, this vulnerability affected the following Cisco
products if they were running a vulnerable release of Cisco software:
Cyber Vision
Umbrella Secure Internet Gateway (SIG)
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
Catalyst 8500 Series Edge Platforms
Firepower Management Center (FMC) Software
Meraki vMX
Meraki Z1 Appliances
Meraki Z3 Series Appliances
Workarounds
o There are no workarounds that address this vulnerability.
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.
Fixed Releases
For information on which Snort and Cisco software releases were vulnerable
at the time of publication, see the sections below.
Cisco Firepower and FTD Software
The Cisco Software Checker does not discriminate between Cisco FTD devices
that are configured with Snort 2 and Snort 3. For configuration-dependent
fixed and vulnerable information, see the table below. For
configuration-independent fixed and vulnerable information, see the Cisco
Software Checker.
Configuration-Dependent Information
In the following table(s), the left column lists Cisco software releases.
The middle column indicates whether a Cisco FTD Software release that is
configured for Snort 2 is affected by the vulnerability that is described
in this advisory and the first release that includes the fix for that
vulnerability. The right column indicates whether an Cisco FTD Software
release that is configured for Snort 3 is affected by the vulnerability
that is described in this advisory and the first release that includes the
fix for that vulnerability.
Customers are advised to upgrade to an appropriate fixed software release
as indicated in this section.
Cisco FTD Software CSCwd83613 CSCwb69096
Release
6.3 and earlier Migrate to a fixed Not affected.
release.
6.4 6.4.0.17 Not affected.
6.5 Migrate to a fixed Not affected.
release.
6.6 Migrate to a fixed Not affected.
release.
6.7 Migrate to a fixed Migrate to a fixed
release. release. ^1
7.0 7.0.6 7.0.5
7.1 Migrate to a fixed 7.1.0.3
release.
7.2 7.2.4 7.2.1
7.3 7.3.1.2 (Mar 2024) Not vulnerable.
1. The Snort 3 configuration option is only available for devices managed
by Cisco FDM in Cisco FTD Release 6.7.
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]
For instructions on upgrading your FTD device, see Cisco Firepower
Management Center Upgrade Guide .
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
Other Platforms
At the time of publication, the release information in the following table
(s) was accurate.
The left column lists Cisco software releases, and the right column
indicates whether a release was affected by the vulnerability that is
described in this advisory and which release included the fix for this
vulnerability.
Cyber Vision: CSCwd09631
Cisco Cyber Vision Release First Fixed Release
3.2.4 and earlier Migrate to a fixed release.
4.0 Migrate to a fixed release.
4.1 4.1.3
UTD Software: CSCwe57521
Cisco UTD Software Release First Fixed Release
17.3 17.3.8
17.6 17.6.6
17.9 17.9.4
17.11 17.11.1a
17.12 17.12.1a
Meraki MX Security Appliances
Cisco Meraki MX Security Appliances First Fixed Release
Release
MX15 and earlier Migrate to a fixed release.
MX16 Hot fix available for MX 16.6.6 and
later.
MX17 Hot fix available for MX 17.0 and
later.
MX18 Hot fix available for MX 18.1 and
later.
Note: No fixes will be provided for the MX64 and MX65 platforms.
Open Source Snort Software
Snort Release First Fixed Release
Snort 2 Migrate to Snort 3.
Snort 3 3.1.32.0
Umbrella SIG
Cisco has addressed this vulnerability in Cisco Umbrella SIG, which is
cloud based. No user action is required.
The Cisco Product Security Incident Response Team (PSIRT) validates only
the affected and fixed release information that is documented in this
advisory.
Exploitation and Public Announcements
o The Cisco 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 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.
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-snort-ftd-zXYtnjOM
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.
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