CVE-2019-10191 Explained : Impact and Mitigation

Knot Resolver before 4.1.0 allows attackers to compromise the security of DNSSEC-protected domains, potentially leading to domain hijacking.

Understanding CVE-2019-10191

An issue in the DNS resolver of Knot Resolver could be exploited by attackers to lower the security of DNSSEC-protected domains.

What is CVE-2019-10191?

This vulnerability in Knot Resolver before version 4.1.0 enables attackers to weaken the security of DNSSEC-protected domains, creating a risk of domain hijacking through attacks on the vulnerable DNS protocol.

The Impact of CVE-2019-10191

The vulnerability poses a medium severity risk with a CVSS base score of 6.3. Attackers can exploit this flaw to compromise the security of DNSSEC-protected domains, potentially leading to domain hijacking.

Technical Details of CVE-2019-10191

Knot Resolver before version 4.1.0 is susceptible to this vulnerability.

Vulnerability Description

The flaw in Knot Resolver allows attackers to lower the security of DNSSEC-protected domains, creating an opportunity for domain hijacking through attacks on the vulnerable DNS protocol.

Affected Systems and Versions

Product: knot-resolver
Vendor: CZ.NIC
Versions Affected: all versions before 4.1.0

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Network
Privileges Required: Low
User Interaction: None
Scope: Unchanged
Confidentiality Impact: Low
Integrity Impact: Low
Availability Impact: Low

Mitigation and Prevention

To address CVE-2019-10191, follow these steps:

Immediate Steps to Take

Update Knot Resolver to version 4.1.0 or later.
Monitor DNS traffic for any suspicious activities.
Implement DNSSEC best practices.

Long-Term Security Practices

Regularly update and patch DNS resolver software.
Conduct security assessments to identify and mitigate vulnerabilities.

Patching and Updates

Apply patches and updates provided by CZ.NIC for Knot Resolver to fix the vulnerability.