CVE-2020-1637 : Vulnerability Insights and Analysis

A vulnerability in Juniper Networks SRX Series device configured as a Junos OS Enforcer device may allow unauthorized access to network resources.

Understanding CVE-2020-1637

This CVE details a Unified Access Control (UAC) bypass vulnerability affecting Juniper Networks Junos OS on SRX Series.

What is CVE-2020-1637?

The vulnerability in the Junos OS Enforcer device may let users access network resources not allowed by a UAC policy due to misconfigured IP ranges in the Infranet Controller.

The Impact of CVE-2020-1637

Base Score: 7.2 (High)
Attack Vector: Network
Privileges Required: None
Scope: Changed
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Technical Details of CVE-2020-1637

This section delves into specific technical aspects of the vulnerability.

Vulnerability Description

The issue allows unauthorized access to network resources not approved by a UAC policy due to misconfiguration of IP address ranges in the Infranet Controller.

Affected Systems and Versions

The following Juniper Networks Junos OS on SRX Series versions are impacted:

12.3X48-D100 and earlier
15.1X49-D210 and earlier
17.3 versions prior to 17.3R2-S5, 17.3R3-S8
17.4 versions prior to 17.4R2-S9, 17.4R3-S1
18.1 versions prior to 18.1R3-S10, and more.

Exploitation Mechanism

Juniper SIRT is unaware of any malicious exploitation of this vulnerability.

Mitigation and Prevention

Learn how to mitigate the risks associated with CVE-2020-1637.

Immediate Steps to Take

Update Junos OS to the fixed versions provided in the solution section.
Ensure proper IP address configuration in the IC Server.

Long-Term Security Practices

Regularly update and patch Junos OS to stay protected from known vulnerabilities.
Implement network segmentation and access controls to limit unauthorized access.

Patching and Updates

Install the following software releases to address this issue and stay secure:

12.3X48-D100, 15.1X49-D210, 16.1R7-S7, and more.