CVE-2020-1673 : Security Advisory and Response

This CVE article provides an overview of a Reflected Cross-site Scripting vulnerability in Juniper Networks J-Web and web based (HTTP/HTTPS) services.

Understanding CVE-2020-1673

This vulnerability in Junos OS could allow an unauthenticated attacker to hijack a user's session and perform administrative actions on affected devices. It is crucial to understand the impact, technical details, and mitigation strategies related to this CVE.

What is CVE-2020-1673?

Insufficient Cross-Site Scripting (XSS) protection in Juniper Networks J-Web and web-based services enables attackers to manipulate users' HTTP/HTTPS sessions, potentially leading to unauthorized administrative actions on affected Junos devices.

The Impact of CVE-2020-1673

CVSS Base Score: 8.8 (High Severity)
Attack Vector: Network
Confidentiality, Integrity, and Availability Impact: High
Privileges Required: None
User Interaction Requirement: Required
This vulnerability could be exploited through convincing actions directed at device administrators.

Technical Details of CVE-2020-1673

This section provides specific technical insights into the vulnerability.

Vulnerability Description

The XSS vulnerability in Juniper Networks J-Web and web-based services allows attackers to control user sessions and execute actions as targeted users on Junos devices.

Affected Systems and Versions

The following Junos OS versions are affected:

18.1 prior to 18.1R3-S1
18.2 prior to 18.2R3-S5
18.3 prior to 18.3R2-S4, 18.3R3-S2
18.4 prior to 18.4R2-S5, 18.4R3-S2
19.1 prior to 19.1R2-S2, 19.1R3-S1
19.2 prior to 19.2R1-S5, 19.2R2
19.3 prior to 19.3R2-S4, 19.3R3
19.4 prior to 19.4R1-S3, 19.4R2
20.1 prior to 20.1R1-S2, 20.1R2

Exploitation Mechanism

To exploit this vulnerability, an attacker needs to manipulate user actions like clicking on crafted URLs or inputting data into the browser console.

Mitigation and Prevention

Understanding how to mitigate and prevent exploitation is crucial for network security.

Immediate Steps to Take

Update affected Junos OS versions to the latest releases as recommended by Juniper Networks.

Long-Term Security Practices

Educate users and administrators on identifying and avoiding phishing attacks.
Implement robust network security measures and monitoring solutions.

Patching and Updates

Install the following updated software releases to address this vulnerability: Junos OS 18.1R3-S11, 18.2R3-S5, 18.3R2-S4, 18.3R3-S2, 18.4R2-S5, 18.4R3-S2, 19.1R2-S2, 19.1R3-S1, 19.2R1-S5, 19.2R2, 19.3R2-S4, 19.3R3, 19.4R1-S3, 19.4R2, 20.1R1-S2, 20.1R2, 20.2R1, and subsequent releases.