CVE-2020-28393 : Security Advisory and Response

An unauthenticated remote attacker could create a permanent denial-of-service condition by sending specially crafted OSPF packets on SCALANCE XM-400, XR-500 devices (All versions prior to v6.4).

Understanding CVE-2020-28393

This CVE involves an incorrect calculation vulnerability that could lead to a denial-of-service attack on affected devices.

What is CVE-2020-28393?

CVE-2020-28393 is a vulnerability that allows an unauthenticated remote attacker to trigger a denial-of-service condition by sending malicious OSPF packets to SCALANCE XM-400, XR-500 devices running versions prior to v6.4.

The Impact of CVE-2020-28393

The exploitation of this vulnerability could result in a permanent denial-of-service condition on the affected devices, disrupting network operations and potentially causing downtime.

Technical Details of CVE-2020-28393

This section provides more in-depth technical details about the vulnerability.

Vulnerability Description

The vulnerability is due to an incorrect calculation in the affected devices, allowing attackers to exploit OSPF functionality to cause a denial-of-service condition.

Affected Systems and Versions

Product: SCALANCE XM-400, XR-500
Versions affected: All versions prior to v6.4

Exploitation Mechanism

Successful exploitation of this vulnerability requires OSPF to be enabled on the affected SCALANCE XM-400, XR-500 devices running versions prior to v6.4.

Mitigation and Prevention

Protecting systems from CVE-2020-28393 involves taking immediate and long-term security measures.

Immediate Steps to Take

Disable OSPF if not required on the affected devices.
Implement network segmentation to limit the impact of potential attacks.
Monitor network traffic for any signs of malicious activity.

Long-Term Security Practices

Regularly update devices to the latest firmware versions to patch known vulnerabilities.
Conduct security assessments and penetration testing to identify and address potential weaknesses.

Patching and Updates

Apply the vendor-provided patch or update to version v6.4 or later to mitigate the vulnerability.