CVE-2023-36842 : Vulnerability Insights and Analysis

A detailed overview of CVE-2023-36842 impacting Junos OS and DHCP Daemon.

Understanding CVE-2023-36842

This CVE involves an Improper Check for Unusual or Exceptional Conditions vulnerability in Juniper DHCP Daemon (jdhcpd) of Juniper Networks Junos OS.

What is CVE-2023-36842?

An adjacent, unauthenticated attacker can cause the jdhcpd to consume all the CPU cycles, resulting in a Denial of Service (DoS) on Junos OS devices.

The Impact of CVE-2023-36842

The vulnerability allows attackers to trigger an infinite loop by sending a specific DHCP packet to a non-configured interface, requiring a DHCP process restart.

Technical Details of CVE-2023-36842

This section covers vulnerability description, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

The vulnerability in Juniper DHCP Daemon (jdhcpd) allows adjacent attackers to cause CPU consumption, leading to a DoS condition.

Affected Systems and Versions

All Junos OS versions before 20.4R3-S9, up to 23.2R2, are affected by this vulnerability.

Exploitation Mechanism

There is no known malicious exploitation of this vulnerability reported by Juniper SIRT.

Mitigation and Prevention

Explore immediate steps, long-term security practices, and patching solutions.

Immediate Steps to Take

Ensure devices are updated with the patched releases provided by Juniper to prevent exploitation.

Long-Term Security Practices

Regularly update Junos OS to stay protected from known vulnerabilities and follow security best practices.

Patching and Updates

Juniper has released updated versions such as Junos OS 20.4R3-S9, 21.2R3-S7, and subsequent releases to address this vulnerability.