CVE-2020-20250 : What You Need to Know

Mikrotik RouterOs before stable version 6.47 is vulnerable to a memory corruption issue in the /nova/bin/lcdstat process, allowing an authenticated remote attacker to trigger a Denial of Service (DoS) through a NULL pointer dereference. This CVE is distinct from CVE-2020-20253 and CVE-2020-20254, with all four vulnerabilities in the /nova/bin/lcdstat process detailed in the CVE-2020-20250 reference.

Understanding CVE-2020-20250

This section provides insights into the nature and impact of the CVE-2020-20250 vulnerability.

What is CVE-2020-20250?

CVE-2020-20250 is a memory corruption vulnerability in Mikrotik RouterOs before stable version 6.47, specifically affecting the /nova/bin/lcdstat process. It enables an authenticated remote attacker to execute a DoS attack via a NULL pointer dereference.

The Impact of CVE-2020-20250

The vulnerability poses a significant risk as it allows attackers to disrupt the normal operation of affected systems, potentially leading to service unavailability and system instability.

Technical Details of CVE-2020-20250

Explore the technical aspects of the CVE-2020-20250 vulnerability.

Vulnerability Description

The vulnerability arises from a memory corruption issue in the /nova/bin/lcdstat process of Mikrotik RouterOs versions prior to 6.47, enabling attackers to exploit a NULL pointer dereference for launching DoS attacks.

Affected Systems and Versions

Affected Systems: Mikrotik RouterOs versions before stable version 6.47
Affected Component: /nova/bin/lcdstat process
Vulnerable Versions: All versions before 6.47

Exploitation Mechanism

Attackers need to be authenticated remotely to exploit this vulnerability. By triggering a NULL pointer dereference in the /nova/bin/lcdstat process, they can cause a DoS condition on the target system.

Mitigation and Prevention

Learn how to mitigate the risks associated with CVE-2020-20250.

Immediate Steps to Take

Update Mikrotik RouterOs to version 6.47 or later to eliminate the vulnerability.
Implement strong authentication mechanisms to prevent unauthorized access to the system.

Long-Term Security Practices

Regularly monitor security advisories from Mikrotik for any new vulnerabilities.
Conduct security assessments and penetration testing to identify and address potential weaknesses.

Patching and Updates

Apply security patches promptly to ensure that known vulnerabilities are addressed effectively.