CVE-2020-25110 : What You Need to Know
Discover the impact of CVE-2020-25110, a DNS implementation flaw in Ethernut in Nut/OS 5.1 leading to Denial-of-Service and Remote Code Execution. Learn about affected systems, exploitation, and mitigation steps.
An issue was discovered in the DNS implementation in Ethernut in Nut/OS 5.1 that could lead to Denial-of-Service and Remote Code Execution.
Understanding CVE-2020-25110
This CVE involves a vulnerability in the DNS implementation in Ethernut in Nut/OS 5.1.
What is CVE-2020-25110?
The length byte of a domain name in a DNS query/response is not checked, allowing it to be used for internal memory operations, potentially leading to Denial-of-Service and Remote Code Execution.
The Impact of CVE-2020-25110
The vulnerability may result in successful Denial-of-Service attacks and potentially allow attackers to execute remote code on affected systems.
Technical Details of CVE-2020-25110
This section provides more technical insights into the CVE.
Vulnerability Description
The issue arises from the lack of validation of the length byte of a domain name in DNS queries/responses, enabling malicious actors to exploit it for harmful activities.
Affected Systems and Versions
- Product: Nut/OS 5.1
- Vendor: Ethernut
- Versions: All versions are affected
Exploitation Mechanism
Attackers can craft malicious DNS queries/responses with manipulated domain name length bytes to trigger the vulnerability, potentially leading to Denial-of-Service or Remote Code Execution.
Mitigation and Prevention
Protecting systems from CVE-2020-25110 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply security patches provided by the vendor promptly.
- Implement network-level protections to filter out potentially malicious DNS traffic.
- Monitor DNS traffic for any anomalies that could indicate exploitation attempts.
Long-Term Security Practices
- Regularly update and patch all software and systems to address known vulnerabilities.
- Conduct security assessments and penetration testing to identify and remediate weaknesses proactively.
- Educate users and IT staff on best practices for handling DNS-related security threats.
Patching and Updates
- Stay informed about security advisories and updates from Ethernut regarding CVE-2020-25110.
- Ensure timely application of patches to mitigate the risk of exploitation.