Network Communication / DNS Server Dynamic Update Record Injection

Description

DNS Server Dynamic Update Record Injection is a security vulnerability that allows attackers to manipulate DNS records through unauthorized dynamic updates. Dynamic updates are a feature of the Domain Name System (DNS) protocol that allows DNS records to be added or modified dynamically. When this feature is misconfigured or left insecure, it opens the door for malicious actors to inject unauthorized records into the DNS server.

Risk

The primary risk associated with DNS Server Dynamic Update Record Injection is the potential for attackers to compromise the integrity and availability of DNS records. By injecting malicious records, attackers can redirect legitimate traffic to malicious destinations, leading to various security threats such as phishing attacks, man-in-the-middle attacks, and unauthorized access to sensitive information. This vulnerability can also be exploited to disrupt network services and cause service outages.

Solution

• Ensure that dynamic updates are configured securely. Limit dynamic updates to authorized clients and restrict access to trusted IP addresses.
• Use Transaction Signatures (TSIG) to authenticate and secure dynamic DNS updates. TSIG provides a mechanism for mutual authentication between the DNS server and clients, preventing unauthorized updates.
• Conduct regular audits of DNS server configurations to identify and address any misconfigurations or insecure settings. This includes reviewing access controls, permissions, and update policies.