Photon OS 4.0: Openssh PHSA-2021-4.0-0113

high Nessus Plugin ID 153972
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Synopsis

The remote PhotonOS host is missing multiple security updates.

Description

An update of the openssh package has been released.

- sshd in OpenSSH 6.2 through 8.x before 8.8, when certain non-default configurations are used, allows privilege escalation because supplemental groups are not initialized as expected. Helper programs for AuthorizedKeysCommand and AuthorizedPrincipalsCommand may run with privileges associated with group memberships of the sshd process, if the configuration specifies running the command as a different user.
(CVE-2021-41617)

- OpenSSH through 8.7 allows remote attackers, who have a suspicion that a certain combination of username and public key is known to an SSH server, to test whether this suspicion is correct. This occurs because a challenge is sent only when that combination could be valid for a login session. (CVE-2016-20012)

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

Solution

Update the affected Linux packages.

See Also

https://github.com/vmware/photon/wiki/Security-Updates-4.0-113.md

Plugin Details

Severity: High

ID: 153972

File Name: PhotonOS_PHSA-2021-4_0-0113_openssh.nasl

Version: 1.4

Type: local

Published: 10/10/2021

Updated: 10/15/2021

Dependencies: ssh_get_info.nasl

Risk Information

CVSS Score Source: CVE-2021-41617

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 4.4

Temporal Score: 3.3

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

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

CVSS v3

Risk Factor: High

Base Score: 7

Temporal Score: 6.1

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

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

Vulnerability Information

CPE: p-cpe:/a:vmware:photonos:openssh, cpe:/o:vmware:photonos:4.0

Required KB Items: Host/local_checks_enabled, Host/PhotonOS/release, Host/PhotonOS/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 10/9/2021

Vulnerability Publication Date: 9/15/2021

Reference Information

CVE: CVE-2016-20012, CVE-2021-41617

IAVA: 2021-A-0474