CVE-2020-20248 : Security Advisory and Response
Learn about CVE-2020-20248, a vulnerability in Mikrotik RouterOs before stable 6.47 allowing an authenticated remote attacker to cause a Denial of Service by overloading the system's CPU. Find mitigation steps and preventive measures.
Mikrotik RouterOs before stable 6.47 suffers from an uncontrolled resource consumption in the memtest process, leading to a Denial of Service attack.
Understanding CVE-2020-20248
This CVE involves a vulnerability in Mikrotik RouterOs that allows an authenticated remote attacker to overload the system's CPU, causing a Denial of Service.
What is CVE-2020-20248?
CVE-2020-20248 is a vulnerability in Mikrotik RouterOs versions prior to stable 6.47 that enables an attacker to trigger uncontrolled resource consumption in the memtest process, resulting in a CPU overload and subsequent Denial of Service.
The Impact of CVE-2020-20248
The exploitation of this vulnerability can lead to a significant impact:
- An authenticated remote attacker can cause a Denial of Service by overloading the system's CPU.
Technical Details of CVE-2020-20248
This section provides more technical insights into the vulnerability.
Vulnerability Description
The vulnerability in Mikrotik RouterOs before stable 6.47 allows for uncontrolled resource consumption in the memtest process, facilitating a Denial of Service attack when exploited by an authenticated remote attacker.
Affected Systems and Versions
- Affected Product: Mikrotik RouterOs
- Affected Version: Before stable 6.47
Exploitation Mechanism
An authenticated remote attacker can exploit this vulnerability by triggering uncontrolled resource consumption in the memtest process, leading to CPU overload and subsequent Denial of Service.
Mitigation and Prevention
Protecting systems from CVE-2020-20248 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Update Mikrotik RouterOs to version 6.47 or newer to mitigate the vulnerability.
- Implement network segmentation to limit the impact of potential attacks.
Long-Term Security Practices
- Regularly monitor and audit system resources to detect unusual consumption patterns.
- Conduct security training for users to recognize and report suspicious activities.
Patching and Updates
- Apply security patches and updates provided by Mikrotik promptly to address known vulnerabilities.