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

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CVE-2021-0289

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
15/07/2021
Last modified:
28/07/2021

Description

When user-defined ARP Policer is configured and applied on one or more Aggregated Ethernet (AE) interface units, a Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability between the Device Control Daemon (DCD) and firewall process (dfwd) daemons of Juniper Networks Junos OS allows an attacker to bypass the user-defined ARP Policer. In this particular case the User ARP policer is replaced with default ARP policer. To review the desired ARP Policers and actual state one can run the command "show interfaces extensive" and review the output. See further details below. An example output is: show interfaces extensive | match policer Policer: Input: __default_arp_policer__

Impact

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

Base Score: 5.30 MEDIUM
Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

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

Base Score 3.x
5.30
Severity 3.x
MEDIUM
Vector 2.0
AV:A/AC:M/Au:N/C:N/I:N/A:P CVSS v2.0 Severity and Metrics:

Base Score: 2.90 LOW
Vector: AV:A/AC:M/Au:N/C:N/I:N/A:P

Attack Vector (AV): Adjacent
Attack Complexity (AC): Medium
Authentication (Au): None
Confidentiality (C): None
Integrity (I): None
Availability (A): Physical

Base Score 2.0
2.90
Severity 2.0
LOW

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:* 5.7 (including) 15.1 (excluding)
cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:* 15.2 (including) 18.4 (excluding)
cpe:2.3:o:juniper:junos:5.6:r1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:18.4:-:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:18.4:r1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:18.4:r1-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:18.4:r1-s2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:18.4:r1-s3:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:18.4:r1-s4:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:18.4:r1-s5:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:18.4:r1-s6:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:18.4:r1-s7:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:18.4:r2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:18.4:r2-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:18.4:r2-s2:*:*:*:*:*:*

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


References to Advisories, Solutions, and Tools