CVE-2022-22250 : What You Need to Know

An Improper Control of a Resource Through its Lifetime vulnerability in Juniper Networks Junos OS and Junos OS Evolved allows attackers to cause a Denial of Service (DoS) by triggering an FPC crash through memory corruption. This vulnerability affects multiple versions of Junos OS and Junos OS Evolved.

Understanding CVE-2022-22250

This CVE involves an issue in the Packet Forwarding Engine (PFE) of Junos OS and Junos OS Evolved, where an attacker can exploit the EVPN MAC entry moving from local to remote to cause a Denial of Service (DoS) attack.

What is CVE-2022-22250?

CVE-2022-22250 is an Improper Control of a Resource Through its Lifetime vulnerability in Juniper Networks Junos OS and Junos OS Evolved, allowing unauthenticated adjacent attackers to disrupt services.

The Impact of CVE-2022-22250

The impact of this vulnerability is the potential for a Denial of Service (DoS) attack through memory corruption leading to line card crashes and reloads.

Technical Details of CVE-2022-22250

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

Vulnerability Description

The vulnerability arises in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS and Junos OS Evolved, enabling unauthenticated adjacent attackers to exploit an EVPN MAC entry transition for a DoS attack.

Affected Systems and Versions

Juniper Networks Junos OS versions 17.3R1 and later prior to 19.2R3-S5, as well as Junos OS Evolved versions prior to 20.4R3-S3-EVO, are affected by this vulnerability.

Exploitation Mechanism

Attackers can exploit the vulnerability by triggering an EVPN MAC entry's move from local to remote, causing memory corruption and subsequent line card crashes.

Mitigation and Prevention

In this section, we discuss immediate steps to take, long-term security practices, and patching and updates.

Immediate Steps to Take

Ensure devices are not configured with EVPN MPLS protocols to prevent exposure to this vulnerability.

Long-Term Security Practices

Implement regular security updates and configurations reviews to mitigate potential risks.

Patching and Updates

Juniper Networks has released updated software to address this vulnerability, including Junos OS versions 19.2R3-S5 and later, as well as Junos OS Evolved versions 20.4R3-S3-EVO and later.