CVE-2021-0290 Information

Description

Improper Handling of Exceptional Conditions in Ethernet interface frame processing of Juniper Networks Junos OS allows an attacker to send specially crafted frames over the local Ethernet segment causing the interface to go into a down state resulting in a Denial of Service (DoS) condition. The interface does not recover on its own and the FPC must be reset manually. Continued receipt and processing of these frames will create a sustained Denial of Service (DoS) condition. This issue is platform-specific and affects the following platforms and line cards: MPC7E/8E/9E and MPC10E on MX240 MX480 MX960 MX2008 MX2010 and MX2020 MX204 MX10003 MX10008 MX10016 EX9200 EX9251 SRX4600 No other products or platforms are affected by this vulnerability. An indication of this issue occurring can be seen in the system log messages as shown below: user@host> show log messages | match \Failed to complete DFE tuning\ fpc4 smic_phy_dfe_tuning_state: et-4/1/6 - Failed to complete DFE tuning (count 3) and interface will be in a permanently down state: user@host> show interfaces et-4/1/6 terse Interface Admin Link Proto Local Remote et-4/1/6 up down et-4/1/6.0 up down aenet –> ae101.0 This issue affects Juniper Networks Junos OS: 16.1 versions prior to 16.1R7-S7 on MX Series; 17.1R1 and later versions prior to 17.2R3-S3 on MX Series; 17.3 versions prior to 17.3R3-S8 on MX Series; 17.4 versions prior to 17.4R2-S11 17.4R3-S1 on MX Series SRX4600; 18.1 versions prior to 18.1R3-S10 on MX Series EX9200 Series SRX4600; 18.2 versions prior to 18.2R3-S3 on MX Series EX9200 Series SRX4600; 18.3 versions prior to 18.3R3-S1 on MX Series EX9200 Series SRX4600; 18.4 versions prior to 18.4R2-S3 18.4R3 on MX Series EX9200 Series SRX4600; 19.1 versions prior to 19.1R2-S1 19.1R3 on MX Series EX9200 Series SRX4600; 19.2 versions prior to 19.2R1-S3 19.2R2 on MX Series EX9200 Series SRX4600; 19.3 versions prior to 19.3R2 on MX Series EX9200 Series SRX4600. This issue does not affect Juniper Networks Junos OS versions prior to 16.1R1.

CVSS Vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Reference

https://kb.juniper.net/JSA11192

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

6.5