CVE-2019-11494 : Exploit Details and Defense Strategies

A vulnerability in Dovecot versions 2.3.3 through 2.3.5.2 could lead to a crash in the submission-login service when a client disconnects prematurely during the AUTH command.

Understanding CVE-2019-11494

This CVE involves a specific scenario in the IMAP Server of Dovecot versions 2.3.3 through 2.3.5.2.

What is CVE-2019-11494?

The vulnerability triggers a crash in the submission-login service of the IMAP Server in Dovecot versions 2.3.3 through 2.3.5.2 when a client disconnects prematurely during the AUTH command.

The Impact of CVE-2019-11494

The impact is rated as HIGH with a CVSS base score of 7.5. The attack complexity is LOW, and the attack vector is through the NETWORK. The vulnerability affects the availability of the system.

Technical Details of CVE-2019-11494

This section provides more technical insights into the CVE.

Vulnerability Description

The submission-login service in Dovecot versions 2.3.3 through 2.3.5.2 crashes when a client disconnects prematurely during the AUTH command.

Affected Systems and Versions

Dovecot versions 2.3.3 through 2.3.5.2

Exploitation Mechanism

The vulnerability can be exploited by disconnecting prematurely during the AUTH command in the IMAP Server of affected Dovecot versions.

Mitigation and Prevention

Protect your systems from CVE-2019-11494 with these mitigation strategies.

Immediate Steps to Take

Update Dovecot to a non-vulnerable version if available.
Monitor vendor advisories for patches and updates.
Implement network security measures to detect and block potential exploitation attempts.

Long-Term Security Practices

Regularly update and patch software to prevent known vulnerabilities.
Conduct security assessments and audits to identify and address weaknesses.
Train staff on secure practices to minimize the risk of exploitation.

Patching and Updates

Apply patches provided by Dovecot promptly to address the vulnerability and enhance system security.