CVE-2020-12673 : Security Advisory and Response

In Dovecot before 2.3.11.3, a specially formatted NTLM request can cause a crash in the auth service due to an out-of-bounds read.

Understanding CVE-2020-12673

This CVE involves a vulnerability in Dovecot that can be exploited through a specific NTLM request, leading to a service crash.

What is CVE-2020-12673?

The vulnerability in Dovecot before version 2.3.11.3 allows attackers to crash the authentication service by sending a specially crafted NTLM request that triggers an out-of-bounds read.

The Impact of CVE-2020-12673

Exploitation of this vulnerability can result in a denial of service (DoS) condition, disrupting the availability of the affected service.

Technical Details of CVE-2020-12673

This section provides more in-depth technical insights into the CVE.

Vulnerability Description

The issue in Dovecot before 2.3.11.3 arises from mishandling of NTLM requests, leading to a crash in the authentication service due to an out-of-bounds read.

Affected Systems and Versions

Dovecot versions before 2.3.11.3 are vulnerable to this issue.

Exploitation Mechanism

Attackers can exploit this vulnerability by sending a specially crafted NTLM request to the affected service, triggering the out-of-bounds read and causing a crash.

Mitigation and Prevention

Protecting systems from CVE-2020-12673 requires immediate actions and long-term security measures.

Immediate Steps to Take

Update Dovecot to version 2.3.11.3 or later to mitigate the vulnerability.
Monitor for any unusual authentication service crashes that could indicate exploitation.

Long-Term Security Practices

Regularly update software and apply security patches promptly to prevent known vulnerabilities.
Implement network segmentation and access controls to limit the impact of potential attacks.

Patching and Updates

Stay informed about security advisories and updates from Dovecot and relevant vendors to address vulnerabilities promptly.