CVE-2019-3979 : Exploit Details and Defense Strategies

This CVE-2019-3979 article provides insights into a vulnerability affecting MikroTik RouterOS versions 6.45.6 Stable and below, and 6.44.5 Long-term and below, allowing for a DNS unrelated data attack.

Understanding CVE-2019-3979

This CVE involves a vulnerability in MikroTik RouterOS versions that can be exploited through a DNS unrelated data attack.

What is CVE-2019-3979?

The vulnerability allows a remote attacker to manipulate the router's DNS cache by sending deceitful responses containing extra and false records.

The Impact of CVE-2019-3979

The vulnerability can lead to DNS cache poisoning, potentially affecting network traffic and security.

Technical Details of CVE-2019-3979

This section delves into the technical aspects of the CVE.

Vulnerability Description

The vulnerability arises when the router accumulates unrelated A records in its DNS cache, enabling remote attackers to manipulate the cache.

Affected Systems and Versions

Product: MikroTik RouterOS
Versions Affected: RouterOS 6.45.6 Stable and below, RouterOS 6.44.5 Long-term and below

Exploitation Mechanism

Attack Type: DNS unrelated data attack
Attack Vector: Remote attacker controlling a DNS server

Mitigation and Prevention

Protecting systems from CVE-2019-3979 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update RouterOS to the latest version to patch the vulnerability
Monitor DNS traffic for any suspicious activities

Long-Term Security Practices

Implement DNS security best practices
Regularly update and patch network devices

Patching and Updates

Apply vendor-provided patches promptly to mitigate the vulnerability