CVE-2020-20249 : Exploit Details and Defense Strategies

Mikrotik RouterOs before stable 6.47 suffers from a memory corruption vulnerability in the resolver process, allowing an authenticated remote attacker to cause a Denial of Service.

Understanding CVE-2020-20249

This CVE identifies a specific vulnerability in Mikrotik RouterOs that can be exploited by an authenticated remote attacker to disrupt services.

What is CVE-2020-20249?

The vulnerability in Mikrotik RouterOs before stable 6.47 enables an attacker to trigger a Denial of Service by sending a specially crafted packet to the resolver process.

The Impact of CVE-2020-20249

The exploitation of this vulnerability can lead to a Denial of Service condition, disrupting the normal operation of the affected system.

Technical Details of CVE-2020-20249

This section provides more technical insights into the vulnerability.

Vulnerability Description

A memory corruption vulnerability in the resolver process of Mikrotik RouterOs before stable 6.47 allows an authenticated remote attacker to cause a Denial of Service by sending a crafted packet.

Affected Systems and Versions

Product: Mikrotik RouterOs
Versions affected: All versions before stable 6.47

Exploitation Mechanism

The vulnerability can be exploited by an authenticated remote attacker sending a specially crafted packet to the resolver process, triggering the Denial of Service.

Mitigation and Prevention

To address CVE-2020-20249, follow these mitigation strategies:

Immediate Steps to Take

Update Mikrotik RouterOs to version 6.47 or later to mitigate the vulnerability.
Monitor network traffic for any suspicious activity that could indicate exploitation.

Long-Term Security Practices

Regularly update and patch all software and firmware to prevent known vulnerabilities.
Implement network segmentation and access controls to limit the impact of potential attacks.

Patching and Updates

Apply security patches provided by Mikrotik promptly to ensure the system is protected against known vulnerabilities.