CVE-2023-36833 : Security Advisory and Response

A detailed overview of CVE-2023-36833 affecting Junos OS Evolved on PTX10001-36MR, PTX10004, PTX10008, PTX10016 with LC1201/1202.

Understanding CVE-2023-36833

This section provides insights into the vulnerability, impact, affected systems, and mitigation strategies.

What is CVE-2023-36833?

A Use After Free vulnerability in the packet forwarding engine allows an adjacent, unauthenticated attacker to cause a Denial of Service (DoS) in Juniper Networks Junos OS Evolved on specific hardware.

The Impact of CVE-2023-36833

The vulnerability leads to the 'aftman-bt' process crashing after multiple flaps on a multicast-only fast reroute, resulting in FPC service disruption.

Technical Details of CVE-2023-36833

Explore the vulnerability description, affected systems, exploitation mechanism, and configurations.

Vulnerability Description

The vulnerability allows an attacker to trigger a DoS by causing a process crash in the packet forwarding engine.

Affected Systems and Versions

Impacted systems include Junos OS Evolved on PTX10001-36MR, PTX10004, PTX10008, PTX10016 with specific LC models, across multiple versions.

Exploitation Mechanism

Currently, there is no indication of malicious exploitation by threat actors, providing a window to mitigate the vulnerability.

Mitigation and Prevention

Learn about immediate steps to take, long-term security practices, and available patches to safeguard against CVE-2023-36833.

Immediate Steps to Take

Infrastructures exposed to this vulnerability should update to the recommended versions or apply stringent configuration changes.

Long-Term Security Practices

Regular security audits, timely updates, and network hardening can fortify defenses against potential cyber threats.

Patching and Updates

Juniper Networks has released updated software versions to address the vulnerability. Upgrading to Junos OS Evolved 21.4R3-S3-EVO or later is recommended.