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FreeBSD : OpenSSH -- OpenSSH 6.2 through 8.7 failed to correctly initialise supplemental groups when executing an AuthorizedKeysCommand or AuthorizedPrincipalsCommand (2a1b931f-2b86-11ec-8acd-c80aa9043978)

high Nessus Plugin ID 154139

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Synopsis

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

Description

OpenBSD Project reports :

sshd(8) from OpenSSH 6.2 through 8.7 failed to correctly initialise supplemental groups when executing an AuthorizedKeysCommand or AuthorizedPrincipalsCommand, where a AuthorizedKeysCommandUser or AuthorizedPrincipalsCommandUser directive has been set to run the command as a different user. Instead these commands would inherit the groups that sshd(8) was started with.

Depending on system configuration, inherited groups may allow AuthorizedKeysCommand/AuthorizedPrincipalsCommand helper programs to gain unintended privilege.

Neither AuthorizedKeysCommand nor AuthorizedPrincipalsCommand are enabled by default in sshd_config(5).

Solution

Update the affected packages.

See Also

https://www.openssh.com/txt/release-8.8

http://www.nessus.org/u?933f297b

Plugin Details

Severity: High

ID: 154139

File Name: freebsd_pkg_2a1b931f2b8611ec8acdc80aa9043978.nasl

Version: 1.5

Type: local

Published: 10/14/2021

Updated: 9/3/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Medium

Base Score: 4.4

Temporal Score: 3.4

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

CVSS Score Source: CVE-2021-41617

CVSS v3

Risk Factor: High

Base Score: 7

Temporal Score: 6.3

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

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

Vulnerability Information

CPE: cpe:/o:freebsd:freebsd, p-cpe:/a:freebsd:freebsd:openssh-portable-hpn, p-cpe:/a:freebsd:freebsd:openssh-portable, p-cpe:/a:freebsd:freebsd:openssh-portable-gssapi

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: 10/12/2021

Vulnerability Publication Date: 9/26/2021

Reference Information

CVE: CVE-2021-41617

IAVA: 2021-A-0474-S