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

1) Interpretation conflict

EUVDB-ID: #VU89824

Risk: Medium

CVSSv3.1: 5.1 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N/E:U/RL:O/RC:C]

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 9.20.2

Cisco Firepower Threat Defense (FTD): before 7.4.1

External links

http://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-ogsnsg-aclbyp-3XB8q6jX
http://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.