ESB-2019.0330 - [UNIX/Linux][Debian] dovecot: Access confidential data - Remote/unauthenticated 2019-02-06

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.0330
                          dovecot security update
                              6 February 2019

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           dovecot
Publisher:         Debian
Operating System:  Debian GNU/Linux 9
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Access Confidential Data -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-3814  

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

Comment: This advisory references vulnerabilities in products which run on 
         platforms other than Debian. It is recommended that administrators 
         running dovecot check for an updated version of the software for 
         their operating system.

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Debian Security Advisory DSA-4385-1                   security@debian.org
https://www.debian.org/security/                     Salvatore Bonaccorso
February 05, 2019                     https://www.debian.org/security/faq
- - -------------------------------------------------------------------------

Package        : dovecot
CVE ID         : CVE-2019-3814

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

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org
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