CVE-2023-36832 : Vulnerability Insights and Analysis

This article provides detailed information about CVE-2023-36832, a vulnerability in Juniper Networks Junos OS affecting MX Series devices, leading to Denial of Service (DoS) attacks.

Understanding CVE-2023-36832

This section explains the vulnerability's description, impact, affected systems, exploitation, and mitigation steps.

What is CVE-2023-36832?

An Improper Handling of Exceptional Conditions vulnerability in Juniper Networks Junos OS allows attackers to crash the packet forwarding engine by sending specific packets to an Aggregated Multiservices (AMS) interface, causing a DoS.

The Impact of CVE-2023-36832

The vulnerability triggers a sustained DoS condition when receiving specific packets destined to a local-interface via a service-interface (AMS) on MX Series devices.

Technical Details of CVE-2023-36832

This section provides in-depth technical details of the vulnerability.

Vulnerability Description

The vulnerability in packet processing on Junos OS allows unauthenticated network-based attackers to crash PFEs, resulting in DoS attacks.

Affected Systems and Versions

All Junos OS versions on MX Series devices prior to 22.4R2 are affected by this vulnerability.

Exploitation Mechanism

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

Mitigation and Prevention

This section outlines immediate and long-term mitigation steps to secure affected systems.

Immediate Steps to Take

Modify configurations to prevent local/host bound ICMP traffic processed by Service Cards or add protect-RE filters to discard ICMP packets.

Long-Term Security Practices

Upgrade to the following software releases: 19.1R3-S10, 19.2R3-S7, 19.3R3-S8, 19.4R3-S12, 20.2R3-S8, 20.4R3-S7, 21.1R3-S5, 21.2R3-S5, 21.3R3-S4, 21.4R3-S3, 22.1R3-S2, 22.2R3, 22.3R2-S1, 22.3R3, 22.4R1-S2, 22.4R2, 23.1R1, and all subsequent releases.

Patching and Updates

Visit the Juniper Networks Security Portal for more information on the fix: Juniper Support Portal