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Red Hat Enterprise Linux 5 RHSA-2008:0297-02 Low: Dovecot Security Update

red hat
Calendar Grey May 21, 2008
Dist Redhat Esm H88
Red Hat Security Advisory Synopsis: Low: dovecot security and bug fix update Advisory ID: RHSA-2008:
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 ...

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

Summary

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:
Users of dovecot are advised to upgrade to this updated package, which resolves these issues.

Topics%20covered

Topics Covered

security advisory Red Hat low severity dovecot update mail access IMAP patch

References

https://www.cve.org/CVERecord?id=CVE-2007-2231 https://www.cve.org/CVERecord?id=CVE-2007-4211 https://www.cve.org/CVERecord?id=CVE-2007-6598 https://www.cve.org/CVERecord?id=CVE-2008-1199 https://access.redhat.com/security/updates/classification#low

Package List

RHEL Desktop Workstation (v. 5 client):
Source:
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:
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://access.redhat.com/security/team/key#package


Severity
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Advisory ID: RHSA-2008:0297-02
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2008:0297.html
Issue date: 2008-05-20
Updated on: 2008-05-21

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.

Topics%20covered

Topics Covered

security advisory Red Hat low severity dovecot update mail access IMAP patch

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

Bugs Fixed

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

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