PT-2021-12977 · Juniper Networks · Junos

Published 2021-04-22 · Updated 2021-05-04 · CVE-2021-0269

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions: Juniper Networks Junos OS versions prior to 17.4R3-S3 Juniper Networks Junos OS 18.1 versions prior to 18.1R3-S12 Juniper Networks Junos OS 18.2 versions prior to 18.2R3-S6 Juniper Networks Junos OS 18.3 versions prior to 18.3R3-S4 Juniper Networks Junos OS 18.4 versions prior to 18.4R3-S6 Juniper Networks Junos OS 19.1 versions prior to 19.1R3-S4 Juniper Networks Junos OS 19.2 versions prior to 19.2R3-S1 Juniper Networks Junos OS 19.3 versions prior to 19.3R3-S1 Juniper Networks Junos OS 19.4 versions prior to 19.4R2-S2, 19.4R3 Juniper Networks Junos OS 20.1 versions prior to 20.1R2 Juniper Networks Junos OS 20.2 versions prior to 20.2R2

Description: The issue is related to the improper handling of client-side parameters in J-Web of Juniper Networks Junos OS. This allows an attacker to perform malicious actions against a target device when a user is authenticated to J-Web. An attacker may be able to supersede existing parameters, access and exploit variables, bypass web application firewall rules or input validation mechanisms, and alter J-Web's normal behavior. This could enable an attacker to transition victims to malicious web services or exfiltrate sensitive information from secure web forms.

Recommendations: For Juniper Networks Junos OS versions prior to 17.4R3-S3, update to version 17.4R3-S3 or later. For Juniper Networks Junos OS 18.1 versions prior to 18.1R3-S12, update to version 18.1R3-S12 or later. For Juniper Networks Junos OS 18.2 versions prior to 18.2R3-S6, update to version 18.2R3-S6 or later. For Juniper Networks Junos OS 18.3 versions prior to 18.3R3-S4, update to version 18.3R3-S4 or later. For Juniper Networks Junos OS 18.4 versions prior to 18.4R3-S6, update to version 18.4R3-S6 or later. For Juniper Networks Junos OS 19.1 versions prior to 19.1R3-S4, update to version 19.1R3-S4 or later. For Juniper Networks Junos OS 19.2 versions prior to 19.2R3-S1, update to version 19.2R3-S1 or later. For Juniper Networks Junos OS 19.3 versions prior to 19.3R3-S1, update to version 19.3R3-S1 or later. For Juniper Networks Junos OS 19.4 versions prior to 19.4R2-S2, 19.4R3, update to version 19.4R2-S2 or 19.4R3 or later. For Juniper Networks Junos OS 20.1 versions prior to 20.1R2, update to version 20.1R2 or later. For Juniper Networks Junos OS 20.2 versions prior to 20.2R2, update to version 20.2R2 or later.

Fix

Weakness Enumeration

CWE-233

Related Identifiers

CVE-2021-0269

Affected Products

Junos

References · 3

• https://osv.dev/vulnerability/CVE-2021-0269 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-0269 · Security Note
• https://kb.juniper.net/JSA11160 · Vendor Advisory