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

1) Insufficient verification of data authenticity

EUVDB-ID: #VU62471

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2022-20795

CWE-ID: CWE-345 - Insufficient Verification of Data Authenticity

Exploit availability: No

Description

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

The vulnerability exists due to suboptimal processing that occurs when establishing a Datagram TLS (DTLS) tunnel as part of an AnyConnect SSL VPN connection. A remote attacker can send specially crafted DTLS traffic and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco Adaptive Security Appliance (ASA): 9.16.3 - 9.17.1.9

Cisco Firepower Threat Defense (FTD): - - 7.1.0.1

CPE2.3

• cpe:2.3:h:cisco_systems:asa:9.17.1.9:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_ftd:7.0.1:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_ftd:7.1.0.1:*:*:*:*:*:*:*

External links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-vpndtls-dos-TunzLEV

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.