Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2021-31356

Severity CVSS v4.0:
Pending analysis
Type:
CWE-78 OS Command Injections
Publication date:
19/10/2021
Last modified:
25/10/2022

Description

A command injection vulnerability in command processing on Juniper Networks Junos OS Evolved allows an attacker with authenticated CLI access to be able to bypass configured access protections to execute arbitrary shell commands within the context of the current user. The vulnerability allows an attacker to bypass command authorization restrictions assigned to their specific user account and execute commands that are available to the privilege level for which the user is assigned. For example, a user that is in the super-user login class, but restricted to executing specific CLI commands could exploit the vulnerability to execute any other command available to an unrestricted admin user. This vulnerability does not increase the privilege level of the user, but rather bypasses any CLI command restrictions by allowing full access to the shell. This issue affects Juniper Networks Junos OS Evolved: All versions prior to 20.4R3-S1-EVO; All versions of 21.1-EVO and 21.2-EVO.

Impact

Vector 3.x
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.80 HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x
7.80
Severity 3.x
HIGH
Vector 2.0
AV:L/AC:L/Au:N/C:C/I:C/A:C CVSS v2.0 Severity and Metrics:

Base Score: 7.20 HIGH
Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C

Attack Vector (AV): Local
Attack Complexity (AC): Low
Authentication (Au): None
Confidentiality (C): Complete
Integrity (I): Complete
Availability (A): Complete

Base Score 2.0
7.20
Severity 2.0
HIGH

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:juniper:junos_os_evolved:*:*:*:*:*:*:*:* 20.3 (including)
cpe:2.3:o:juniper:junos_os_evolved:20.4:r1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos_os_evolved:20.4:r1-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos_os_evolved:20.4:r1-s2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos_os_evolved:20.4:r2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos_os_evolved:20.4:r2-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos_os_evolved:20.4:r2-s2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos_os_evolved:20.4:r2-s3:*:*:*:*:*:*
cpe:2.3:o:juniper:junos_os_evolved:20.4:r3:*:*:*:*:*:*
cpe:2.3:o:juniper:junos_os_evolved:21.1:-:*:*:*:*:*:*
cpe:2.3:o:juniper:junos_os_evolved:21.1:r1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos_os_evolved:21.1:r1-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos_os_evolved:21.1:r2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos_os_evolved:21.2:r1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos_os_evolved:21.2:r1-s1:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools