Issued:

2013-02-21

Updated:

2013-02-21

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

Synopsis

Low: dovecot security and bug fix update

Type/Severity

Security Advisory Low

Topic

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.

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.

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

Affected Products

Updated Packages

• dovecot-2.0.9-5.el6.ppc64.rpm
• dovecot-mysql-2.0.9-5.el6.x86_64.rpm
• dovecot-mysql-2.0.9-5.el6.s390x.rpm
• dovecot-debuginfo-2.0.9-5.el6.s390.rpm
• dovecot-2.0.9-5.el6.s390x.rpm
• dovecot-devel-2.0.9-5.el6.s390x.rpm
• dovecot-mysql-2.0.9-5.el6.i686.rpm
• dovecot-debuginfo-2.0.9-5.el6.s390x.rpm
• dovecot-pgsql-2.0.9-5.el6.s390x.rpm
• dovecot-devel-2.0.9-5.el6.ppc64.rpm
• dovecot-2.0.9-5.el6.src.rpm
• dovecot-pgsql-2.0.9-5.el6.i686.rpm
• dovecot-2.0.9-5.el6.s390.rpm
• dovecot-debuginfo-2.0.9-5.el6.x86_64.rpm
• dovecot-debuginfo-2.0.9-5.el6.ppc.rpm
• dovecot-pigeonhole-2.0.9-5.el6.x86_64.rpm
• dovecot-debuginfo-2.0.9-5.el6.ppc64.rpm
• dovecot-debuginfo-2.0.9-5.el6.i686.rpm
• dovecot-devel-2.0.9-5.el6.i686.rpm
• dovecot-mysql-2.0.9-5.el6.ppc64.rpm
• dovecot-2.0.9-5.el6.x86_64.rpm
• dovecot-pgsql-2.0.9-5.el6.x86_64.rpm
• dovecot-2.0.9-5.el6.ppc.rpm
• dovecot-2.0.9-5.el6.i686.rpm
• dovecot-pgsql-2.0.9-5.el6.ppc64.rpm
• dovecot-devel-2.0.9-5.el6.x86_64.rpm
• dovecot-pigeonhole-2.0.9-5.el6.ppc64.rpm
• dovecot-pigeonhole-2.0.9-5.el6.s390x.rpm
• dovecot-pigeonhole-2.0.9-5.el6.i686.rpm

Fixes

• This content is not included.BZ - 709095
• This content is not included.BZ - 709097
• This content is not included.BZ - 754980

CVEs

• CVE-2011-2166
• CVE-2011-2167
• CVE-2011-4318

References

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

Additional information

• The Red Hat security contact is This content is not included.secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.
• Offline Security Data data is available for integration with other systems. See Offline Security Data API to get started.