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AUSCERT External Security Bulletin Redistribution
ESB-2023.6379
Cisco Firepower Threat Defense Software Snort 3 Geolocation
IP Filter Bypass 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-2023-20267
Original Bulletin:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftdsnort3sip-bypass-LMz2ThKn
Comment: CVSS (Max): 4.0 CVE-2023-20267 (CVSS:3.1/AV:N/AC:H/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:H/PR:N/UI:N/S:C/C:N/I:L/A:N
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Cisco Firepower Threat Defense Software Snort 3 Geolocation IP Filter Bypass
Vulnerability
Priority: Medium
Advisory ID: cisco-sa-ftdsnort3sip-bypass-LMz2ThKn
First Published: 2023 November 1 16:00 GMT
Version 1.0: Final
Workarounds: Yes
Cisco Bug IDs: CSCwe69833
CVE Names: CVE-2023-20267
Summary
o A vulnerability in the IP geolocation rules of Snort 3 could allow an
unauthenticated, remote attacker to potentially bypass IP address
restrictions.
This vulnerability exists because the configuration for IP geolocation
rules is not parsed properly. An attacker could exploit this vulnerability
by spoofing an IP address until they bypass the restriction. A successful
exploit could allow the attacker to bypass location-based IP address
restrictions.
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-ftdsnort3sip-bypass-LMz2ThKn
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 Cisco FTD Software
if it was running a vulnerable release and had the Snort 3 detection engine
configured with a geolocation inspection policy.
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.
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 Firepower Management Center (FMC) Software
Open Source Snort 2
Open Source Snort 3
Details
o Exploitation of this vulnerability could allow an attacker to bypass
protections that are provided by an ACL that is applied on an affected
device. The overall impact of exploitation is organization specific because
it depends on the importance of the assets that the ACL was supposed to
protect. Customers should evaluate how exploitation of this vulnerability
would impact their network and proceed according to their own
vulnerability-handling and remediation processes.
Indicators of Compromise
o The Cisco Security Indicators of Compromise Reference Guide lists commonly
observed IoCs, which can help identify devices that may have been impacted
by the vulnerability disclosed in this Cisco security advisory.
Workarounds
o There is a workaround that addresses this vulnerability.
In the geolocation configuration file, configure a non-critical IP
exclusion range as the last entry. This entry will be ignored.
While this workaround has been deployed and was 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]
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
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-ftdsnort3sip-bypass-LMz2ThKn
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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