Denial of service in Cisco ASA and FTD on Cisco Firepower 2100 Series

1) Input validation error

EUVDB-ID: #VU77080

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-20006

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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

The vulnerability exists due to an implementation error within the cryptographic functions for SSL/TLS traffic processing when they are offloaded to the hardware. A remote attacker can send a specially crafted stream of SSL/TLS traffic to an affected device and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco Adaptive Security Appliance (ASA): 9.16.4 - 9.18.2.5

Cisco Firepower Threat Defense (FTD): 7.2.1 - 7.2.3

CPE2.3

• cpe:2.3:h:cisco_systems:cisco_ftd:7.2.3:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_ftd:7.2.2:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_ftd:7.2.1:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:asa:9.16.4:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:asa:9.18.2.5:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:asa:9.18.2:*:*:*:*:*:*:*

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-ssl-dos-uu7mV5p6
http://bst.cloudapps.cisco.com/bugsearch/bug/CSCwc94466

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.