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

1) Input validation error

EUVDB-ID: #VU27594

Risk: High

CVSSv4.0: 6.6 [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:U/U:Amber]

CVE-ID: CVE-2020-3191

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 improper length validation of a field in an IPv6 DNS packet. A remote attacker can send a specially crafted DNS query over IPv6 and perform a denial of service (DoS) attack.

Mitigation

Install updarom vendor's website.

Vulnerable software versions

Cisco Adaptive Security Appliance (ASA): - - 9.12

Cisco Firepower Threat Defense (FTD): - - 6.4.0

CPE2.3

• cpe:2.3:h:cisco_systems:asa:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:asa:9.5:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:asa:9.6:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:asa:9.7:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:asa:9.8:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:asa:9.9:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:asa:9.10:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:asa:9.12:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_ftd:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_ftd:6.1.0:*:*:*:*:*:*:*

External links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-ipv6-67pA658k

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.