CVE-2023-36850 : What You Need to Know
Discover the impact of CVE-2023-36850, an improper validation vulnerability in the Connectivity Fault Management module of Juniper Networks Junos OS on MX Series. Learn about affected systems, exploitation, and mitigation steps.
A vulnerability has been discovered in the Connectivity Fault Management (CFM) module of Juniper Networks Junos OS on MX Series, which could allow an adjacent attacker to cause a Denial of Service (DoS) attack. This article provides detailed insights into CVE-2023-36850, its impact, technical details, and mitigation strategies.
Understanding CVE-2023-36850
This section delves deeper into the specifics of the CVE-2023-36850 vulnerability.
What is CVE-2023-36850?
An improper validation vulnerability in the CFM module of Juniper Networks Junos OS on MX Series allows a local attacker to trigger a DoS attack by sending malformed CFM packets when CFM hasn't been configured.
The Impact of CVE-2023-36850
The vulnerability can result in a sustained denial of service as the MPC crashes upon receiving such packets. The adjacent attacker needs to be on the local broadcast domain to exploit this issue.
Technical Details of CVE-2023-36850
This section outlines the vulnerability description, affected systems and versions, as well as the exploitation mechanism.
Vulnerability Description
When improperly validated CFM packets are received by the MPC, a DoS can be triggered, leading to a sustained denial of service.
Affected Systems and Versions
Juniper Networks Junos OS versions on MX Series prior to 19.1R3-S10 and subsequent releases up to 22.4R2 are vulnerable to this issue.
Exploitation Mechanism
The vulnerability can be exploited by an adjacent attacker on the local broadcast domain sending malformed CFM packets.
Mitigation and Prevention
In this section, you will find guidance on immediate steps to take and long-term security practices to mitigate the risks associated with CVE-2023-36850.
Immediate Steps to Take
Users are advised to upgrade to the recommended software releases to address the vulnerability. No workarounds are currently available for this issue.
Long-Term Security Practices
Implementing regular software updates and configuring CFM can help prevent potential DoS attacks. Following best security practices and staying informed about vulnerabilities is crucial.
Patching and Updates
Juniper Networks has released updated software versions including Junos OS 19.1R3-S10, 19.2R3-S7, 19.4R3-S12, and all subsequent releases to mitigate the CVE-2023-36850 vulnerability.