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Debian Security Advisory DSA 4385-1 (dovecot - security update)
Information
Severity
Severity
Family
Family
CVSSv2 Base
CVSSv2 Base
CVSSv2 Vector
CVSSv2 Vector
Solution Type
Solution Type
Created
Created
Modified
Modified
Summary
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 = yesauth_ssl_username_from_cert = yes are affected by this flaw.
Affected Software
Affected Software
dovecot on Debian Linux
Detection Method
Detection Method
This check tests the installed software version using the apt package manager.
Solution
Solution
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 linked in the references.