CVE-2021-23386 Explained : Impact and Mitigation

This CVE-2021-23386 affects the package dns-packet before version 5.2.2, leading to Remote Memory Exposure when querying crafted invalid domain names over an unencrypted network.

Understanding CVE-2021-23386

This vulnerability, assigned CVE-2021-23386, involves the package dns-packet and its versions prior to 5.2.2, allowing Remote Memory Exposure.

What is CVE-2021-23386?

CVE-2021-23386 affects dns-packet versions before 5.2.2, creating buffers without always filling them, exposing internal memory over unencrypted networks.

The Impact of CVE-2021-23386

The base severity of this CVE is rated as HIGH with a CVSS base score of 7.7. It can result in high confidentiality impact and low integrity impact.

Technical Details of CVE-2021-23386

This section provides detailed technical insights into the CVE-2021-23386 vulnerability.

Vulnerability Description

The vulnerability lies in dns-packet versions prior to 5.2.2, allowing the exposure of internal application memory over unencrypted networks by creating buffers without proper filling.

Affected Systems and Versions

The affected product is dns-packet with versions before 5.2.2.

Exploitation Mechanism

By querying crafted invalid domain names, attackers can exploit this vulnerability to expose internal memory over unencrypted networks.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-23386, certain steps need to be followed.

Immediate Steps to Take

Immediately upgrade the dns-packet package to version 5.2.2 or above to eliminate this vulnerability. Avoid querying crafted invalid domain names over unencrypted networks.

Long-Term Security Practices

Regularly update and patch all software components to ensure the latest security fixes are in place. Implement encryption mechanisms to protect sensitive information.

Patching and Updates

Keep track of security advisories and update notifications for dns-packet to stay informed about any new patches or updates.