[RHSA-2008:0297-02] Low: dovecot security and bug fix update

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Red Hat Security Advisory

 

Synopsis: Low: dovecot security and bug fix update

Advisory ID: RHSA-2008:0297-02

Product: Red Hat Enterprise Linux

Advisory URL: https://rhn.redhat.com/errata/RHSA-2008-0297.html

Issue date: 2008-05-20

Updated on: 2008-05-21

CVE Names: CVE-2007-2231 CVE-2007-4211 CVE-2007-6598

CVE-2008-1199

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1. Summary:

 

An updated dovecot package that fixes several security issues and various

bugs is now available for Red Hat Enterprise Linux 5.

 

This update has been rated as having low security impact by the Red Hat

Security Response Team.

 

2. Relevant releases/architectures:

 

RHEL Desktop Workstation (v. 5 client) - i386, x86_64

Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64

 

3. Description:

 

Dovecot is an IMAP server for Linux and UNIX-like systems, primarily

written with security in mind.

 

A flaw was discovered in the way Dovecot handled the "mail_extra_groups"

option. An authenticated attacker with local shell access could leverage

this flaw to read, modify, or delete other users mail that is stored on

the mail server. (CVE-2008-1199)

 

This issue did not affect the default Red Hat Enterprise Linux 5 Dovecot

configuration. This update adds two new configuration options --

"mail_privileged_group" and "mail_access_groups" -- to minimize the usage

of additional privileges.

 

A directory traversal flaw was discovered in Dovecot's zlib plug-in. An

authenticated user could use this flaw to view other compressed mailboxes

with the permissions of the Dovecot process. (CVE-2007-2231)

 

A flaw was found in the Dovecot ACL plug-in. User with only insert

permissions for a mailbox could use the "COPY" and "APPEND" commands to set

additional message flags. (CVE-2007-4211)

 

A flaw was found in a way Dovecot cached LDAP query results in certain

configurations. This could possibly allow authenticated users to log in as

a different user who has the same password. (CVE-2007-6598)

 

As well, this updated package fixes the following bugs:

 

* configuring "userdb" and "passdb" to use LDAP caused Dovecot to hang. A

segmentation fault may have occurred. In this updated package, using an

LDAP backend for "userdb" and "passdb" no longer causes Dovecot to hang.

 

* the Dovecot "login_process_size" limit was configured for 32-bit systems.

On 64-bit systems, when Dovecot was configured to use either IMAP or POP3,

the log in processes crashed with out-of-memory errors. Errors such as the

following were logged:

 

pop3-login: pop3-login: error while loading shared libraries:

libsepol.so.1: failed to map segment from shared object: Cannot allocate

memory

 

In this updated package, the "login_process_size" limit is correctly

configured on 64-bit systems, which resolves this issue.

 

Note: this updated package upgrades dovecot to version 1.0.7. For

further details, refer to the Dovecot changelog:

http://koji.fedoraproject.org/koji/buildinfo?buildID=23397

 

Users of dovecot are advised to upgrade to this updated package, which

resolves these issues.

 

4. Solution:

 

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

errata relevant to your system have been applied.

 

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

the Red Hat Network to apply this update are available at

http://kbase.redhat.com/faq/FAQ_58_10188

 

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

 

238439 - CVE-2007-2231 Directory traversal in dovecot with zlib plugin

245249 - Dovecot hangs while using ldap backend.

251007 - CVE-2007-4211 Dovecot possible privilege ascalation in ACL plugin

253363 - Dovecot pop3-login/imap-login crash with OOM error

331441 - Please consider upgrading Dovecot to 1.0rc23 at least

380401 - tracker bug for 1.0.7 rebase

427575 - CVE-2007-6598: dovecot LDAP+auth cache user login mixup

436927 - CVE-2008-1199 dovecot: insecure mail_extra_groups option

 

6. Package List:

 

RHEL Desktop Workstation (v. 5 client):

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/dovecot-1.0.7-2.el5.src.rpm

 

i386:

dovecot-1.0.7-2.el5.i386.rpm

dovecot-debuginfo-1.0.7-2.el5.i386.rpm

 

x86_64:

dovecot-1.0.7-2.el5.x86_64.rpm

dovecot-debuginfo-1.0.7-2.el5.x86_64.rpm

 

Red Hat Enterprise Linux (v. 5 server):

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/dovecot-1.0.7-2.el5.src.rpm

 

i386:

dovecot-1.0.7-2.el5.i386.rpm

dovecot-debuginfo-1.0.7-2.el5.i386.rpm

 

ia64:

dovecot-1.0.7-2.el5.ia64.rpm

dovecot-debuginfo-1.0.7-2.el5.ia64.rpm

 

ppc:

dovecot-1.0.7-2.el5.ppc.rpm

dovecot-debuginfo-1.0.7-2.el5.ppc.rpm

 

s390x:

dovecot-1.0.7-2.el5.s390x.rpm

dovecot-debuginfo-1.0.7-2.el5.s390x.rpm

 

x86_64:

dovecot-1.0.7-2.el5.x86_64.rpm

dovecot-debuginfo-1.0.7-2.el5.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://www.redhat.com/security/team/key/#package

 

7. References:

 

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-2231

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4211

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-6598

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1199

http://www.redhat.com/security/updates/classification/#low

 

8. Contact:

 

The Red Hat security contact is . More contact

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

 

Copyright 2008 Red Hat, Inc.

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