CVE-2023-36847 : Vulnerability Insights and Analysis

A Missing Authentication for Critical Function vulnerability in Juniper Networks Junos OS on EX Series allows an unauthenticated, network-based attacker to cause limited impact to the file system integrity. The vulnerability, assigned CVE-2023-36847, was published on August 17, 2023, by Juniper Networks.

Understanding CVE-2023-36847

This section will cover the details of the CVE-2023-36847 vulnerability affecting Juniper Networks Junos OS on EX Series.

What is CVE-2023-36847?

The vulnerability allows an attacker to upload arbitrary files via J-Web without authentication, potentially compromising the integrity of the file system and leading to possible exploitation of other vulnerabilities. Affected versions include those prior to 20.4R3-S8 and various versions up to 22.4R3.

The Impact of CVE-2023-36847

While Juniper SIRT has not detected any malicious exploitation, the vulnerability could lead to a loss of integrity in the file system, posing a risk of further security breaches.

Technical Details of CVE-2023-36847

This section will delve into the technical aspects of the CVE-2023-36847 vulnerability.

Vulnerability Description

A specific request to installAppPackage.php allows unauthenticated attackers to upload arbitrary files via J-Web, potentially compromising file system integrity.

Affected Systems and Versions

Juniper Networks Junos OS on EX Series versions ranging from before 20.4R3-S8 to various releases up to 22.4R3 are affected by this vulnerability.

Exploitation Mechanism

The vulnerability originates from insufficient authentication controls in J-Web, enabling attackers to upload files without proper authorization.

Mitigation and Prevention

This section outlines the necessary steps to mitigate and prevent exploitation of the CVE-2023-36847 vulnerability.

Immediate Steps to Take

Disable J-Web or restrict access to trusted hosts to prevent unauthorized file uploads and maintain system integrity.

Long-Term Security Practices

Regularly update to patched software releases provided by Juniper Networks to resolve the vulnerability and enhance system security.

Patching and Updates

Software releases such as 20.4R3-S8, 21.2R3-S6, 21.3R3-S5, and subsequent versions have been updated to address the CVE-2023-36847 vulnerability.