Executive Summary

Title dovecot security update
Name DSA-4385 First vendor Publication 2019-02-05
Vendor Debian Last vendor Modification 2019-02-05
Severity (Vendor) N/A Revision 1

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector :
Cvss Base Score N/A Attack Range N/A
Cvss Impact Score N/A Attack Complexity N/A
Cvss Expoit Score N/A Authentication N/A
Calculate full CVSS 2.0 Vectors scores


halfdog discovered an authentication bypass vulnerability in the Dovecot email server. Under some configurations Dovecot mistakenly trusts the username provided via authentication instead of failing. If there is no additional password verification, this allows the attacker to login as anyone else in the system. Only installations using:

auth_ssl_require_client_cert = yes auth_ssl_username_from_cert = yes

are affected by this flaw.

For the stable distribution (stretch), this problem has been fixed in version 1:2.2.27-3+deb9u3.

We recommend that you upgrade your dovecot packages.

For the detailed security status of dovecot please refer to its security tracker page at: https://security-tracker.debian.org/tracker/dovecot

Original Source

Url : http://www.debian.org/security/2019/dsa-4385

Alert History

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Date Informations
2019-02-05 21:18:37
  • First insertion