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Cisco Adaptive Security Appliance and Firepower Threat Defense Software Inactive-to-Active ACL Bypass Vulnerability

cisco-sa-asaftd-ogsnsg-aclbyp-3XB8q6jX · Medium · Published · Updated

A vulnerability in the activation of an access control list (ACL) on Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass the protection that is offered by a configured ACL on an affected device. This vulnerability is due to a logic error that occurs when an ACL changes from inactive to active in the running configuration of an affected device. An attacker could exploit this vulnerability by sending traffic through the affected device that should be denied by the configured ACL. The reverse condition is also true—traffic that should be permitted could be denied by the configured ACL. A successful exploit could allow the attacker to bypass configured ACL protections on the affected device, allowing the attacker to access trusted networks that the device might be protecting. Note: This vulnerability applies to both IPv4 and IPv6 traffic as well as dual-stack ACL configurations in which both IPv4 and IPv6 ACLs are configured on an interface. Cisco has released software updates that address this vulnerability. There is a workaround that addresses this vulnerability. This advisory is available at the following link:https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-ogsnsg-aclbyp-3XB8q6jX This advisory is part of the May 2024 release of the Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: May 2024 Semiannual Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication.

Cisco advisory · CSAF JSON

Workarounds

There is a workaround that addresses this vulnerability. The access list that is not working can be removed and reconfigured to work around this vulnerability. Use the example configuration from the Vulnerable Products ["#vp"] section of this advisory to execute the following CLI commands:

device# no access-list CSM_FW_ACL_ extended permit ip host 192.168.1.1 object-group sample1
device# access-list CSM_FW_ACL_ extended permit ip host 192.168.1.1 object-group sample1

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.

CVEsCVE-2024-20293
Cisco Bug IDsCSCwi17713
CVSS ScoreBase 5.8
Base 5.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N/E:X/RL:X/RC:X
Product Names From Source
Cisco Adaptive Security Appliance (ASA) Software 9.19.1, Cisco Adaptive Security Appliance (ASA) Software 9.19.1.5, Cisco Adaptive Security Appliance (ASA) Software 9.19.1.9, Cisco Adaptive Security Appliance (ASA) Software 9.19.1.12, Cisco Adaptive Security Appliance (ASA) Software 9.19.1.18, Cisco Adaptive Security Appliance (ASA) Software 9.19.1.22, Cisco Adaptive Security Appliance (ASA) Software 9.19.1.24, Cisco Adaptive Security Appliance (ASA) Software 9.20.1, Cisco Adaptive Security Appliance (ASA) Software 9.20.1.5, Cisco Firepower Threat Defense Software 7.3.0, Cisco Firepower Threat Defense Software 7.3.1, Cisco Firepower Threat Defense Software 7.3.1.1, Cisco Firepower Threat Defense Software 7.3.1.2, Cisco Firepower Threat Defense Software 7.4.0, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software, Cisco Secure Firewall Threat Defense (FTD) Software, Cisco Firepower 2100 Series, Cisco Firepower 1000 Series, Cisco 3000 Series Industrial Security Appliances (ISA), Cisco Firepower 9000 Series, Cisco Firepower 4100 Series, Cisco Adaptive Security Virtual Appliance (ASAv), Cisco Secure Firewall 3100 Series, Cisco Secure Firewall 4200 Series, Cisco Secure Firewall Threat Defense Virtual

Related Products

Product CVE Evidence
Cisco Secure Firewall Threat Defense Virtual CVE-2024-20293 Cisco OpenVuln
Cisco Secure Firewall Threat Defense (FTD) Software CVE-2024-20293 Cisco OpenVuln
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software CVE-2024-20293 Cisco OpenVuln
Cisco Secure Firewall 4200 Series CVE-2024-20293 Cisco OpenVuln
Cisco Secure Firewall 3100 Series CVE-2024-20293 Cisco OpenVuln
Cisco Firepower Threat Defense Software CVE-2024-20293 Cisco OpenVuln
Cisco Firepower 9000 Series CVE-2024-20293 Cisco OpenVuln
Cisco Firepower 4100 Series CVE-2024-20293 Cisco OpenVuln
Cisco Firepower 2100 Series CVE-2024-20293 Cisco OpenVuln
Cisco Firepower 1000 Series CVE-2024-20293 Cisco OpenVuln
Cisco Adaptive Security Virtual Appliance (ASAv) CVE-2024-20293 Cisco OpenVuln
Cisco Adaptive Security Appliance (ASA) Software CVE-2024-20293 Cisco OpenVuln
Cisco 3000 Series Industrial Security Appliances (ISA) CVE-2024-20293 Cisco OpenVuln