[RHSA-2013:0520-02] Low: dovecot security and bug fix update

[news 28]

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Red Hat Security Advisory

 

Synopsis: Low: dovecot security and bug fix update

Advisory ID: RHSA-2013:0520-02

Product: Red Hat Enterprise Linux

Advisory URL: https://rhn.redhat.com/errata/RHSA-2013-0520.html

Issue date: 2013-02-21

CVE Names: CVE-2011-2166 CVE-2011-2167 CVE-2011-4318

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1. Summary:

 

Updated dovecot packages that fix three security issues and one bug are now

available for Red Hat Enterprise Linux 6.

 

The Red Hat Security Response Team has rated this update as having low

security impact. Common Vulnerability Scoring System (CVSS) base scores,

which give detailed severity ratings, are available for each vulnerability

from the CVE links in the References section.

 

2. Relevant releases/architectures:

 

Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64

Red Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64

Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64

Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64

 

3. Description:

 

Dovecot is an IMAP server, written with security primarily in mind, for

Linux and other UNIX-like systems. It also contains a small POP3 server. It

supports mail in either of maildir or mbox formats. The SQL drivers and

authentication plug-ins are provided as sub-packages.

 

Two flaws were found in the way some settings were enforced by the

script-login functionality of Dovecot. A remote, authenticated user could

use these flaws to bypass intended access restrictions or conduct a

directory traversal attack by leveraging login scripts. (CVE-2011-2166,

CVE-2011-2167)

 

A flaw was found in the way Dovecot performed remote server identity

verification, when it was configured to proxy IMAP and POP3 connections to

remote hosts using TLS/SSL protocols. A remote attacker could use this flaw

to conduct man-in-the-middle attacks using an X.509 certificate issued by

a trusted Certificate Authority (for a different name). (CVE-2011-4318)

 

This update also fixes the following bug:

 

* When a new user first accessed their IMAP inbox, Dovecot was, under some

circumstances, unable to change the group ownership of the inbox directory

in the user's Maildir location to match that of the user's mail spool

(/var/mail/$USER). This correctly generated an "Internal error occurred"

message. However, with a subsequent attempt to access the inbox, Dovecot

saw that the directory already existed and proceeded with its operation,

leaving the directory with incorrectly set permissions. This update

corrects the underlying permissions setting error. When a new user now

accesses their inbox for the first time, and it is not possible to set

group ownership, Dovecot removes the created directory and generates an

error message instead of keeping the directory with incorrect group

ownership. (BZ#697620)

 

Users of dovecot are advised to upgrade to these updated packages, which

contain backported patches to correct these issues. After installing the

updated packages, the dovecot service will be restarted automatically.

 

4. Solution:

 

Before applying this update, make sure all previously-released errata

relevant to your system have been applied.

 

This update is available via the Red Hat Network. Details on how to

use the Red Hat Network to apply this update are available at

https://access.redhat.com/knowledge/articles/11258

 

5. Bugs fixed (http://bugzilla.redhat.com/):

 

709095 - CVE-2011-2166 dovecot: authenticated remote bypass of intended access restrictions

709097 - CVE-2011-2167 dovecot: directory traversal due to not obeying chroot directive

754980 - CVE-2011-4318 dovecot: proxy destination host name not checked against SSL certificate name

 

6. Package List:

 

Red Hat Enterprise Linux Server (v. 6):

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/dovecot-2.0.9-5.el6.src.rpm

 

i386:

dovecot-2.0.9-5.el6.i686.rpm

dovecot-debuginfo-2.0.9-5.el6.i686.rpm

dovecot-mysql-2.0.9-5.el6.i686.rpm

dovecot-pgsql-2.0.9-5.el6.i686.rpm

dovecot-pigeonhole-2.0.9-5.el6.i686.rpm

 

ppc64:

dovecot-2.0.9-5.el6.ppc.rpm

dovecot-2.0.9-5.el6.ppc64.rpm

dovecot-debuginfo-2.0.9-5.el6.ppc.rpm

dovecot-debuginfo-2.0.9-5.el6.ppc64.rpm

dovecot-mysql-2.0.9-5.el6.ppc64.rpm

dovecot-pgsql-2.0.9-5.el6.ppc64.rpm

dovecot-pigeonhole-2.0.9-5.el6.ppc64.rpm

 

s390x:

dovecot-2.0.9-5.el6.s390.rpm

dovecot-2.0.9-5.el6.s390x.rpm

dovecot-debuginfo-2.0.9-5.el6.s390.rpm

dovecot-debuginfo-2.0.9-5.el6.s390x.rpm

dovecot-mysql-2.0.9-5.el6.s390x.rpm

dovecot-pgsql-2.0.9-5.el6.s390x.rpm

dovecot-pigeonhole-2.0.9-5.el6.s390x.rpm

 

x86_64:

dovecot-2.0.9-5.el6.i686.rpm

dovecot-2.0.9-5.el6.x86_64.rpm

dovecot-debuginfo-2.0.9-5.el6.i686.rpm

dovecot-debuginfo-2.0.9-5.el6.x86_64.rpm

dovecot-mysql-2.0.9-5.el6.x86_64.rpm

dovecot-pgsql-2.0.9-5.el6.x86_64.rpm

dovecot-pigeonhole-2.0.9-5.el6.x86_64.rpm

 

Red Hat Enterprise Linux Server Optional (v. 6):

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/dovecot-2.0.9-5.el6.src.rpm

 

i386:

dovecot-debuginfo-2.0.9-5.el6.i686.rpm

dovecot-devel-2.0.9-5.el6.i686.rpm

 

ppc64:

dovecot-debuginfo-2.0.9-5.el6.ppc64.rpm

dovecot-devel-2.0.9-5.el6.ppc64.rpm

 

s390x:

dovecot-debuginfo-2.0.9-5.el6.s390x.rpm

dovecot-devel-2.0.9-5.el6.s390x.rpm

 

x86_64:

dovecot-debuginfo-2.0.9-5.el6.x86_64.rpm

dovecot-devel-2.0.9-5.el6.x86_64.rpm

 

Red Hat Enterprise Linux Workstation (v. 6):

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/dovecot-2.0.9-5.el6.src.rpm

 

i386:

dovecot-2.0.9-5.el6.i686.rpm

dovecot-debuginfo-2.0.9-5.el6.i686.rpm

dovecot-mysql-2.0.9-5.el6.i686.rpm

dovecot-pgsql-2.0.9-5.el6.i686.rpm

dovecot-pigeonhole-2.0.9-5.el6.i686.rpm

 

x86_64:

dovecot-2.0.9-5.el6.i686.rpm

dovecot-2.0.9-5.el6.x86_64.rpm

dovecot-debuginfo-2.0.9-5.el6.i686.rpm

dovecot-debuginfo-2.0.9-5.el6.x86_64.rpm

dovecot-mysql-2.0.9-5.el6.x86_64.rpm

dovecot-pgsql-2.0.9-5.el6.x86_64.rpm

dovecot-pigeonhole-2.0.9-5.el6.x86_64.rpm

 

Red Hat Enterprise Linux Workstation Optional (v. 6):

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/dovecot-2.0.9-5.el6.src.rpm

 

i386:

dovecot-debuginfo-2.0.9-5.el6.i686.rpm

dovecot-devel-2.0.9-5.el6.i686.rpm

 

x86_64:

dovecot-debuginfo-2.0.9-5.el6.x86_64.rpm

dovecot-devel-2.0.9-5.el6.x86_64.rpm

 

These packages are GPG signed by Red Hat for security. Our key and

details on how to verify the signature are available from

https://access.redhat.com/security/team/key/#package

 

7. References:

 

https://www.redhat.com/security/data/cve/CVE-2011-2166.html

https://www.redhat.com/security/data/cve/CVE-2011-2167.html

https://www.redhat.com/security/data/cve/CVE-2011-4318.html

https://access.redhat.com/security/updates/classification/#low

 

8. Contact:

 

The Red Hat security contact is . More contact

details at https://access.redhat.com/security/team/contact/

 

Copyright 2013 Red Hat, Inc.

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