Denial of service in Cisco Adaptive Security Appliance and Firepower Threat Defense Software Web Services

1) Infinite loop

EUVDB-ID: #VU88981

Risk: High

CVSSv4.0: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:A/U:Amber]

CVE-ID: CVE-2024-20353

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Exploit availability: No

Description

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

The vulnerability exists due to infinite loop when parsing HTTP headers. A remote attacker can send specially crafted HTTP request to the appliance and perform a denial of service (DoS) attack.

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

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco Adaptive Security Appliance (ASA): before 9.16.4.57, 9.18.4.22, 9.19.1.28, 9.20.2.10, 9.16.4.57

Cisco Firepower Threat Defense (FTD): before 9.16.4.57, 9.18.4.22, 9.19.1.28, 9.20.2.10, 9.16.4.57, 9.16.4.57, 9.16.4.57

CPE2.3

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

External links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-websrvs-dos-X8gNucD2
https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwj10955
https://blog.talosintelligence.com/arcanedoor-new-espionage-focused-campaign-found-targeting-perimeter-network-devices/

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.