Denial of service and brute-force attack in Cisco ASA and FTD Remote Access VPN

1) Missing Release of Resource after Effective Lifetime

EUVDB-ID: #VU99291

Risk: High

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

CVE-ID: CVE-2024-20481

CWE-ID: CWE-772 - Missing Release of Resource after Effective Lifetime

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to resource exhaustion in the Remote Access VPN (RAVPN) service. A remote attacker can perform password spraying attack, cause resource exhaustion and perform a denial of service attack against the RAVPN service.

Note, the vulnerability is being actively exploited in the wild.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco Firepower Threat Defense (FTD): 7.0.0 - 7.0.6.2

Cisco Adaptive Security Appliance (ASA): 9.16 - 9.20.2.21

CPE2.3

• cpe:2.3:h:cisco_systems:cisco_ftd:7.0.6.2:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:asa:9.16.4.61:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:asa:9.17.1.39:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:asa:9.20.2.21:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:asa:9.18.4.24:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:asa:9.19.1.31:*:*:*:*:*:*:*

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-bf-dos-vDZhLqrW
http://bst.cloudapps.cisco.com/bugsearch/bug/CSCwj45822
http://bst.cloudapps.cisco.com/bugsearch/bug/CSCwj91570

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?

Yes. This vulnerability is being exploited in the wild.