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Security Advisory Low: dovecot security and bug fix update

Advisory: RHSA-2008:0297-6
Type: Security Advisory
Severity: Low
Issued on: 2008-05-20
Last updated on: 2008-05-21
Affected Products: RHEL Desktop Workstation (v. 5 client)
Red Hat Enterprise Linux (v. 5 server)
CVEs (cve.mitre.org): CVE-2007-2231
CVE-2007-4211
CVE-2007-6598
CVE-2008-1199

Details

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.

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.


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

Updated packages

RHEL Desktop Workstation (v. 5 client)

SRPMS:
dovecot-1.0.7-2.el5.src.rpm
File outdated by:  RHBA-2013:0976
    MD5: 07d6431d4d2406a041227cbf5b1889a7
 
IA-32:
dovecot-1.0.7-2.el5.i386.rpm
File outdated by:  RHBA-2013:0976
    MD5: 3c3d47b150a52daea5574052907e14cc
 
x86_64:
dovecot-1.0.7-2.el5.x86_64.rpm
File outdated by:  RHBA-2013:0976
    MD5: 1c09c9b5df91a0877840bcef4f995d9b
 
Red Hat Enterprise Linux (v. 5 server)

SRPMS:
dovecot-1.0.7-2.el5.src.rpm
File outdated by:  RHBA-2013:0976
    MD5: 07d6431d4d2406a041227cbf5b1889a7
 
IA-32:
dovecot-1.0.7-2.el5.i386.rpm
File outdated by:  RHBA-2013:0976
    MD5: 3c3d47b150a52daea5574052907e14cc
 
IA-64:
dovecot-1.0.7-2.el5.ia64.rpm
File outdated by:  RHBA-2013:0976
    MD5: bccf9715433bad0bf430919cf0da20d9
 
PPC:
dovecot-1.0.7-2.el5.ppc.rpm
File outdated by:  RHBA-2013:0976
    MD5: b91651a1d7695760c128085ea7bc6f23
 
s390x:
dovecot-1.0.7-2.el5.s390x.rpm
File outdated by:  RHBA-2013:0976
    MD5: 49a42723d7ad9b73b0b130cc22f35d25
 
x86_64:
dovecot-1.0.7-2.el5.x86_64.rpm
File outdated by:  RHBA-2013:0976
    MD5: 1c09c9b5df91a0877840bcef4f995d9b
 
(The unlinked packages above are only available from the Red Hat Network)

Bugs fixed (see bugzilla for more information)

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


References



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

The Red Hat security contact is secalert@redhat.com. More contact details at http://www.redhat.com/security/team/contact/