FreeBSD : NGINX -- 1-byte memory overwrite in resolver (0882f019-bd60-11eb-9bdd-8c164567ca3c)

critical Nessus Plugin ID 149974


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The remote FreeBSD host is missing one or more security-related updates.


NGINX team reports :

1-byte memory overwrite might occur during DNS server response processing if the 'resolver' directive was used, allowing an attacker who is able to forge UDP packets from the DNS server to cause worker process crash or, potentially, arbitrary code execution.


Update the affected packages.

See Also

Plugin Details

Severity: Critical

ID: 149974

File Name: freebsd_pkg_0882f019bd6011eb9bdd8c164567ca3c.nasl

Version: 1.5

Type: local

Published: 5/26/2021

Updated: 10/18/2021

Dependencies: ssh_get_info.nasl

Risk Information

CVSS Score Source: CVE-2021-23017


Risk Factor: High

Score: 8


Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.3

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

Temporal Vector: E:POC/RL:OF/RC:C


Risk Factor: Critical

Base Score: 9.4

Temporal Score: 8.4

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

Temporal Vector: E:P/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:nginx, p-cpe:/a:freebsd:freebsd:nginx-devel, cpe:/o:freebsd:freebsd

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 5/25/2021

Vulnerability Publication Date: 5/25/2021

Reference Information

CVE: CVE-2021-23017