CVE-2020-1681 Explained : Impact and Mitigation

Juniper Networks Junos OS Evolved is affected by a vulnerability that could lead to a Denial of Service (DoS) attack when processing specifically malformed NDP packets.

Understanding CVE-2020-1681

This CVE details a vulnerability in Junos OS Evolved that allows for a DoS attack under specific conditions.

What is CVE-2020-1681?

The vulnerability in Juniper Networks Junos OS Evolved allows for a Denial of Service (DoS) attack through the reception of specifically malformed Neighbor Discovery Protocol (NDP) packets.

The Impact of CVE-2020-1681

The receipt of a specifically malformed NDP packet can crash the ndp process, resulting in a temporary DoS. Continuous exploitation of this vulnerability could lead to an extended DoS condition affecting IPv6 neighbor learning. This issue is limited to IPv6 packet processing.

Technical Details of CVE-2020-1681

Junos OS Evolved is susceptible to a DoS attack triggered by malformed NDP packets.

Vulnerability Description

The vulnerability in Junos OS Evolved allows a remote attacker to crash the ndp process by sending specifically crafted NDP packets, causing a DoS condition.

Affected Systems and Versions

Product: Junos OS Evolved
Vendor: Juniper Networks
Vulnerable Version: All versions prior to 20.1R2-EVO

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Adjacent Network
Impact: Denial of Service (DoS) with high availability impact

Mitigation and Prevention

Implementing appropriate measures to mitigate and prevent this vulnerability is essential.

Immediate Steps to Take

Apply the provided software updates that address the vulnerability.

Long-Term Security Practices

Regularly update software to the latest versions to prevent known vulnerabilities.

Patching and Updates

Update to the fixed versions: Junos OS Evolved 20.1R2-EVO, 20.2R1-EVO, and subsequent releases.