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.
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.
For information about which products were vulnerable at the time of publication, see the following sections.
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.
At the time of publication, this vulnerability affected the following Cisco products if they were running a vulnerable release of Cisco software:
For information about which Cisco software releases are vulnerable, see the Fixed Software section of this advisory.
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:
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
=======================================================
.
.
.
At the time of publication, this vulnerability affected the following Cisco products if they were running a vulnerable release of Cisco software:
For information about which Cisco software releases are vulnerable, see the Fixed Software section of this advisory.
At the time of publication, this vulnerability affected the following Cisco products if they were running a vulnerable release of Cisco software:
For information about which Cisco software releases are vulnerable, see the Fixed Software section of this advisory.
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:
There are no workarounds that address this vulnerability.
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.
For information on which Snort and Cisco software releases were vulnerable at the time of publication, see the sections below.
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.
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 Release | CSCwd83613 | CSCwb69096 |
|---|---|---|
| 6.3 and earlier | Migrate to a fixed release. | Not affected. |
| 6.4 | 6.4.0.17 | Not affected. |
| 6.5 | Migrate to a fixed release. | Not affected. |
| 6.6 | Migrate to a fixed release. | Not affected. |
| 6.7 | Migrate to a fixed release. | Migrate to a fixed release.1 |
| 7.0 | 7.0.6 | 7.0.5 |
| 7.1 | Migrate to a fixed release. | 7.1.0.3 |
| 7.2 | 7.2.4 | 7.2.1 |
| 7.3 | 7.3.1.2 (Mar 2024) | Not vulnerable. |
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:
For instructions on upgrading your FTD device, see Cisco Firepower Management Center Upgrade Guide.
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
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 Release | First Fixed 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.
The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
This vulnerability was found during internal security testing.
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 | 2023-NOV-01 |
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