CVE-2021-0278: Junos OS: J-Web allows a locally authenticated attacker to escalate their privileges to root.

Published Jul 15, 2021

Updated

An Improper Input Validation vulnerability in J-Web of Juniper Networks Junos OS allows a locally authenticated attacker to escalate their privileges to root over the target device. junos:18.3R3-S5 junos:18.4R3-S9 junos:19.1R3-S6 junos:19.3R2-S6 junos:19.3R3-S3 junos:19.4R1-S4 junos:19.4R3-S4 junos:20.1R2-S2 junos:20.1R3 junos:20.2R3-S1 junos:20.3X75-D20 junos:20.3X75-D30 junos:20.4R2-S1 junos:20.4R3 junos:21.1R1-S1 junos:21.1R2 junos:21.2R1 junos:21.3R1 This issue affects: Juniper Networks Junos OS 19.3 versions 19.3R1 and above prior to 19.3R2-S6, 19.3R3-S3; 19.4 versions prior to 19.4R3-S5; 20.1 versions prior to 20.1R2-S2, 20.1R3-S1; 20.2 versions prior to 20.2R3-S2; 20.3 versions prior to 20.3R3; 20.4 versions prior to 20.4R2-S1, 20.4R3; 21.1 versions prior to 21.1R1-S1, 21.1R2. This issue does not affect Juniper Networks Junos OS versions prior to 19.3R1.

Affected Software

50 affected components

Juniper Junos=19.3-r1

Juniper Junos=19.3-r1-s1

Juniper Junos=19.3-r2

Juniper Junos=19.3-r2-s1

Juniper Junos=19.3-r2-s2

Juniper Junos=19.3-r2-s3

Juniper Junos=19.3-r2-s4

Juniper Junos=19.3-r2-s5

Juniper Junos=19.3-r3

Juniper Junos=19.3-r3-s1

Juniper Junos=19.3-r3-s2

Juniper Junos=19.4-r1

Juniper Junos=19.4-r1-s1

Juniper Junos=19.4-r1-s2

Juniper Junos=19.4-r1-s3

Juniper Junos=19.4-r2

Juniper Junos=19.4-r2-s1

Juniper Junos=19.4-r2-s2

Juniper Junos=19.4-r2-s3

Juniper Junos=19.4-r3

Juniper Junos=19.4-r3-s1

Juniper Junos=19.4-r3-s2

Juniper Junos=19.4-r3-s3

Juniper Junos=19.4-r3-s4

Juniper Junos=20.1-r1

Juniper Junos=20.1-r1-s1

Juniper Junos=20.1-r1-s2

Juniper Junos=20.1-r1-s3

Juniper Junos=20.1-r1-s4

Juniper Junos=20.1-r2

Juniper Junos=20.1-r2-s1

Juniper Junos=20.1-r3

Juniper Junos=20.2-r1

Juniper Junos=20.2-r1-s1

Juniper Junos=20.2-r1-s2

Juniper Junos=20.2-r1-s3

Juniper Junos=20.2-r2

Juniper Junos=20.2-r2-s1

Juniper Junos=20.2-r2-s2

Juniper Junos=20.2-r2-s3

Juniper Junos=20.2-r3

Juniper Junos=20.2-r3-s1

Juniper Junos=20.3-r1

Juniper Junos=20.3-r1-s1

Juniper Junos=20.3-r2

Juniper Junos=20.3-r2-s1

Juniper Junos=20.4-r1

Juniper Junos=20.4-r1-s1

Juniper Junos=20.4-r2

Juniper Junos=21.1-r1

Remediation

Information

The following software releases have been updated to resolve this specific issue: 19.3R2-S6, 19.3R3-S3, 19.4R3-S5, 20.1R2-S2, 20.1R3-S1, 20.2R3-S2, 20.3R3, 20.4R2-S1, 20.4R3, 21.1R1-S1, 21.1R2, 21.2R1, and all subsequent releases. In addition to the above fixed releases, for the following not-affected releases additional security enhancements were included in Junos OS 18.3R3-S5, 18.4R3-S9, 19.1R3-S6 as a result of resolving this issue.

Event History

Jul 15, 2021

CVE Published

via MITRE·08:00 PM

Data Sourced

via MITRE·08:00 PM

RemedyDescriptionSeverityWeakness

Frequently Asked Questions

What is the severity of CVE-2021-0278?

CVE-2021-0278 is rated as a high severity vulnerability.

How do I fix CVE-2021-0278?

To fix CVE-2021-0278, you should apply the latest security updates provided by Juniper Networks for affected versions of Junos OS.

Which versions of Junos OS are affected by CVE-2021-0278?

CVE-2021-0278 affects Junos OS versions including 18.3R3-S5, 18.4R3-S9, 19.1R3-S6, 19.3R2-S6, 19.3R3-S3, 19.4R1-S4, and several others.

What type of attack is enabled by CVE-2021-0278?

CVE-2021-0278 allows a locally authenticated attacker to escalate their privileges to root level on the affected device.

Is CVE-2021-0278 a remote or local vulnerability?

CVE-2021-0278 is a local vulnerability, requiring local authentication to exploit.