CVE-2020-17470 : What You Need to Know

An issue was discovered in FNET through 4.6.4 where the DNS client interface structure initializes with non-random transaction IDs, making DNS cache poisoning attacks easier.

Understanding CVE-2020-17470

This CVE identifies a vulnerability in FNET through version 4.6.4 that could be exploited for DNS cache poisoning attacks.

What is CVE-2020-17470?

The vulnerability in FNET allows attackers to predict transaction IDs, simplifying DNS cache poisoning attacks.

The Impact of CVE-2020-17470

The lack of randomization in transaction IDs increases the risk of successful DNS cache poisoning attacks, potentially leading to unauthorized DNS resolutions.

Technical Details of CVE-2020-17470

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The issue lies in the initialization of DNS client interface structure in FNET, where transaction IDs are consistently set to 1, making them predictable.

Affected Systems and Versions

Product: FNET
Vendor: N/A
Versions affected: All versions up to 4.6.4

Exploitation Mechanism

Attackers can exploit this vulnerability by leveraging the predictable transaction IDs to manipulate DNS responses and redirect traffic.

Mitigation and Prevention

Protecting systems from CVE-2020-17470 requires immediate actions and long-term security measures.

Immediate Steps to Take

Apply vendor patches or updates if available
Implement network-level protections to detect and block DNS cache poisoning attempts

Long-Term Security Practices

Regularly monitor DNS traffic for anomalies
Conduct security assessments to identify and remediate vulnerabilities

Patching and Updates

Check for patches or updates from FNET to address the vulnerability
Keep systems up to date with the latest security fixes and configurations