Synopsis

Low: dovecot security and bug fix update

Type/Severity

Security Advisory: Low

Topic

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.

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.

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

Affected Products

• Red Hat Enterprise Linux Server 5 x86_64
• Red Hat Enterprise Linux Server 5 ia64
• Red Hat Enterprise Linux Server 5 i386
• Red Hat Enterprise Linux Workstation 5 x86_64
• Red Hat Enterprise Linux Workstation 5 i386
• Red Hat Enterprise Linux for IBM z Systems 5 s390x
• Red Hat Enterprise Linux for Power, big endian 5 ppc
• Red Hat Enterprise Linux Server from RHUI 5 x86_64
• Red Hat Enterprise Linux Server from RHUI 5 i386

Fixes

• BZ - 238439 - CVE-2007-2231 Directory traversal in dovecot with zlib plugin
• BZ - 245249 - Dovecot hangs while using ldap backend.
• BZ - 251007 - CVE-2007-4211 Dovecot possible privilege ascalation in ACL plugin
• BZ - 253363 - Dovecot pop3-login/imap-login crash with OOM error
• BZ - 331441 - Please consider upgrading Dovecot to 1.0rc23 at least
• BZ - 380401 - tracker bug for 1.0.7 rebase
• BZ - 427575 - CVE-2007-6598: dovecot LDAP+auth cache user login mixup
• BZ - 436927 - CVE-2008-1199 dovecot: insecure mail_extra_groups option

CVEs

• CVE-2007-2231
• CVE-2007-6598
• CVE-2007-4211
• CVE-2008-1199

References

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

Red Hat Enterprise Linux Server 5

SRPM
dovecot-1.0.7-2.el5.src.rpm	SHA-256: cd8a9a41738400c3b70e38d70015afe4fe284c200b2cd5569c13f7562c3de7bd
x86_64
dovecot-1.0.7-2.el5.x86_64.rpm	SHA-256: c8b5cce8b84dc8013c19261352a0f1e7d58abf7ca548df26697cb9f7331222e0
ia64
dovecot-1.0.7-2.el5.ia64.rpm	SHA-256: 57e8242747a4372a47d9bed64e9ae7a8b74cec828904c43411574f7dfb9874e7
i386
dovecot-1.0.7-2.el5.i386.rpm	SHA-256: 6181597ab7a16453aac66d7fefef86bd8320f17775377f613674eb0c23a52b38

Red Hat Enterprise Linux Workstation 5

SRPM
dovecot-1.0.7-2.el5.src.rpm	SHA-256: cd8a9a41738400c3b70e38d70015afe4fe284c200b2cd5569c13f7562c3de7bd
x86_64
dovecot-1.0.7-2.el5.x86_64.rpm	SHA-256: c8b5cce8b84dc8013c19261352a0f1e7d58abf7ca548df26697cb9f7331222e0
i386
dovecot-1.0.7-2.el5.i386.rpm	SHA-256: 6181597ab7a16453aac66d7fefef86bd8320f17775377f613674eb0c23a52b38

Red Hat Enterprise Linux for IBM z Systems 5

SRPM
dovecot-1.0.7-2.el5.src.rpm	SHA-256: cd8a9a41738400c3b70e38d70015afe4fe284c200b2cd5569c13f7562c3de7bd
s390x
dovecot-1.0.7-2.el5.s390x.rpm	SHA-256: 00d37897927314b5a52ea57af49c188b240efb0cb674980ad39086a69313e949

Red Hat Enterprise Linux for Power, big endian 5

SRPM
dovecot-1.0.7-2.el5.src.rpm	SHA-256: cd8a9a41738400c3b70e38d70015afe4fe284c200b2cd5569c13f7562c3de7bd
ppc
dovecot-1.0.7-2.el5.ppc.rpm	SHA-256: 399af1976f42aed38601b16ba5ce6caaba87a3164e6b83728eee2ff5ea4538d5

Red Hat Enterprise Linux Server from RHUI 5

SRPM
dovecot-1.0.7-2.el5.src.rpm	SHA-256: cd8a9a41738400c3b70e38d70015afe4fe284c200b2cd5569c13f7562c3de7bd
x86_64
dovecot-1.0.7-2.el5.x86_64.rpm	SHA-256: c8b5cce8b84dc8013c19261352a0f1e7d58abf7ca548df26697cb9f7331222e0
i386
dovecot-1.0.7-2.el5.i386.rpm	SHA-256: 6181597ab7a16453aac66d7fefef86bd8320f17775377f613674eb0c23a52b38