ACL bypass in Cisco Adaptive Security Appliance and Firepower Threat Defense software

1) Interpretation conflict

EUVDB-ID: #VU89824

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2024-20293

CWE-ID: CWE-436 - Interpretation Conflict

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to a logic error when activating an access control list (ACL). A remote non-authenticated attacker can bypass implemented access controls and gain unauthorized access to the network.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco Adaptive Security Appliance (ASA): before 9.19.1.27, 9.20.2, 9.19.1.27

Cisco Firepower Threat Defense (FTD): before 7.4.1

CPE2.3

• cpe:2.3:h:cisco_systems:asa:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_ftd:*:*:*:*:*:*:*:*

External links

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-ogsnsg-aclbyp-3XB8q6jX
https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwi17713

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.