Ubuntu 20.04 LTS : vsftpd vulnerability (USN-6379-1)

high Nessus Plugin ID 181543


The remote Ubuntu host is missing a security update.


The remote Ubuntu 20.04 LTS host has a package installed that is affected by a vulnerability as referenced in the USN-6379-1 advisory.

- ALPACA is an application layer protocol content confusion attack, exploiting TLS servers implementing different protocols but using compatible certificates, such as multi-domain or wildcard certificates. A MiTM attacker having access to victim's traffic at the TCP/IP layer can redirect traffic from one subdomain to another, resulting in a valid TLS session. This breaks the authentication of TLS and cross- protocol attacks may be possible where the behavior of one protocol service may compromise the other at the application layer. (CVE-2021-3618)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.


Update the affected vsftpd package.

See Also


Plugin Details

Severity: High

ID: 181543

File Name: ubuntu_USN-6379-1.nasl

Version: 1.0

Type: local

Agent: unix

Published: 9/18/2023

Updated: 9/18/2023

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment

Risk Information


Risk Factor: Medium

Score: 5.2


Risk Factor: Medium

Base Score: 5.8

Temporal Score: 4.3

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:N

CVSS Score Source: CVE-2021-3618


Risk Factor: High

Base Score: 7.4

Temporal Score: 6.4

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:20.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:vsftpd

Required KB Items: Host/cpu, Host/Debian/dpkg-l, Host/Ubuntu, Host/Ubuntu/release

Exploit Ease: No known exploits are available

Patch Publication Date: 9/18/2023

Vulnerability Publication Date: 10/25/2021

Reference Information

CVE: CVE-2021-3618

USN: 6379-1