Vulnerability identifier: #VU82670

Vulnerability 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-2023-20256

CWE-ID: CWE-840

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco Adaptive Security Appliance (ASA)
Hardware solutions / Security hardware applicances
Cisco Firepower Threat Defense (FTD)
Hardware solutions / Security hardware applicances

Vendor: Cisco Systems, Inc

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to a logic error that can occur when the affected software constructs and applies per-user-override rules. A remote attacker can bypass the interface ACL and access resources that should be protected.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cisco Adaptive Security Appliance (ASA): 9.12.4.26 - 9.19.1.5

Cisco Firepower Threat Defense (FTD): 9.12.4.26 - 9.12.4.56, 9.14.4 - 9.14.4.23, 9.16.4 - 9.16.4.14, 9.17.1 - 9.17.1.30, 9.18.2 - 9.18.2.8, 9.18.3, 9.19.1 - 9.19.1.5, 9.16.3 - 9.16.3.23, 9.18.1 - 9.18.1.3, 9.16.2 - 9.16.2.14, 9.14.3 - 9.14.3.18, 9.16.1.28

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External links
http://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-ac-acl-bypass-bwd7q6Gb

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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.