CVE-2020-0856 Explained : Impact and Mitigation

CVE-2020-0856 was published on September 11, 2020, by Microsoft. It involves an information disclosure vulnerability in Active Directory integrated DNS (ADIDNS) that allows an attacker to read sensitive information about the target system. The vulnerability has a CVSS base score of 6.5 (Medium).

Understanding CVE-2020-0856

This CVE addresses the Active Directory information disclosure vulnerability impacting various Windows Server versions.

What is CVE-2020-0856?

An information disclosure flaw in ADIDNS potentially allows authenticated attackers to access sensitive system information by exploiting mishandled objects.

The Impact of CVE-2020-0856

The vulnerability enables attackers to extract confidential data from the target system, though exploitation alone may not lead to system compromise.

Technical Details of CVE-2020-0856

This section covers the vulnerability description, affected systems, and exploitation mechanism.

Vulnerability Description

The flaw arises from how ADIDNS processes objects in memory, leading to potential data exposure.

Affected Systems and Versions

Windows Server 2019, 1909, 1903, 2004, 2016, 2012, 2012 R2, 2008, and 2008 R2 (various editions) are impacted.

Exploitation Mechanism

Authenticated attackers exploit the vulnerability by sending crafted requests to the ADIDNS service.

Mitigation and Prevention

Learn about the steps needed to mitigate and prevent the vulnerability.

Immediate Steps to Take

Apply the provided update to correct how ADIDNS handles objects in memory.

Long-Term Security Practices

Conduct regular security assessments and apply patches promptly.
Implement strong access controls and monitor ADIDNS activity.
Ensure security training for staff to recognize and report suspicious activities.