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Category:   Application (E-mail Server)  >   Cyrus IMAP Server Vendors:   Carnegie Mellon University
(Red Hat Issues Fix) Cyrus IMAP Server STARTTLS Buffer Flushing Flaw Lets Remote Users Inject Commands via Man-in-the-Middle Attacks
SecurityTracker Alert ID:  1025626
SecurityTracker URL:  http://securitytracker.com/id/1025626
CVE Reference:   CVE-2011-1926   (Links to External Site)
Date:  Jun 9 2011
Impact:   Disclosure of authentication information, Disclosure of user information, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 2.4.7
Description:   A vulnerability was reported in Cyrus IMAP Server. A remote user can inject commands.

The server does not flush the received commands buffer after switching to TLS encryption for IMAP, LMTP, NNTP, and POP3 sessions. A remote user can conduct a man-in-the-middle attack to inject commands and gain access to the target user's mail credentials or mail.

Impact:   A remote user can gain access to the target user's mail credentials or mail.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2011-0859.html

Vendor URL:  www.cyrusimap.org/ (Links to External Site)
Cause:   Access control error, State error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  4, 5, 6

Message History:   This archive entry is a follow-up to the message listed below.
Jun 9 2011 Cyrus IMAP Server STARTTLS Buffer Flushing Flaw Lets Remote Users Inject Commands via Man-in-the-Middle Attacks



 Source Message Contents

Subject:  [RHSA-2011:0859-01] Moderate: cyrus-imapd security update

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: cyrus-imapd security update
Advisory ID:       RHSA-2011:0859-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2011-0859.html
Issue date:        2011-06-08
CVE Names:         CVE-2011-1926 
=====================================================================

1. Summary:

Updated cyrus-imapd packages that fix one security issue are now available
for Red Hat Enterprise Linux 4, 5, and 6.

The Red Hat Security Response Team has rated this update as having moderate
security impact. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available from the CVE link in
the References section.

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
Red Hat Enterprise Linux AS version 4 - i386, ia64, ppc, s390, s390x, x86_64
Red Hat Enterprise Linux Desktop version 4 - i386, x86_64
Red Hat Enterprise Linux ES version 4 - i386, ia64, x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux WS version 4 - i386, ia64, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64

3. Description:

The cyrus-imapd packages contain a high-performance mail server with IMAP,
POP3, NNTP, and Sieve support.

It was discovered that cyrus-imapd did not flush the received commands
buffer after switching to TLS encryption for IMAP, LMTP, NNTP, and POP3
sessions. A man-in-the-middle attacker could use this flaw to inject
protocol commands into a victim's TLS session initialization messages. This
could lead to those commands being processed by cyrus-imapd, potentially
allowing the attacker to steal the victim's mail or authentication
credentials. (CVE-2011-1926)

Users of cyrus-imapd are advised to upgrade to these updated packages,
which contain a backported patch to correct this issue. After installing
the update, cyrus-imapd will be restarted automatically.

4. 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/kb/docs/DOC-11259

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

705288 - CVE-2011-1926 cyrus-imapd: STARTTLS plaintext command injection

6. Package List:

Red Hat Enterprise Linux AS version 4:

Source:
ftp://updates.redhat.com/enterprise/4AS/en/os/SRPMS/cyrus-imapd-2.2.12-15.el4.src.rpm

i386:
cyrus-imapd-2.2.12-15.el4.i386.rpm
cyrus-imapd-debuginfo-2.2.12-15.el4.i386.rpm
cyrus-imapd-devel-2.2.12-15.el4.i386.rpm
cyrus-imapd-murder-2.2.12-15.el4.i386.rpm
cyrus-imapd-nntp-2.2.12-15.el4.i386.rpm
cyrus-imapd-utils-2.2.12-15.el4.i386.rpm
perl-Cyrus-2.2.12-15.el4.i386.rpm

ia64:
cyrus-imapd-2.2.12-15.el4.ia64.rpm
cyrus-imapd-debuginfo-2.2.12-15.el4.ia64.rpm
cyrus-imapd-devel-2.2.12-15.el4.ia64.rpm
cyrus-imapd-murder-2.2.12-15.el4.ia64.rpm
cyrus-imapd-nntp-2.2.12-15.el4.ia64.rpm
cyrus-imapd-utils-2.2.12-15.el4.ia64.rpm
perl-Cyrus-2.2.12-15.el4.ia64.rpm

ppc:
cyrus-imapd-2.2.12-15.el4.ppc.rpm
cyrus-imapd-debuginfo-2.2.12-15.el4.ppc.rpm
cyrus-imapd-devel-2.2.12-15.el4.ppc.rpm
cyrus-imapd-murder-2.2.12-15.el4.ppc.rpm
cyrus-imapd-nntp-2.2.12-15.el4.ppc.rpm
cyrus-imapd-utils-2.2.12-15.el4.ppc.rpm
perl-Cyrus-2.2.12-15.el4.ppc.rpm

s390:
cyrus-imapd-2.2.12-15.el4.s390.rpm
cyrus-imapd-debuginfo-2.2.12-15.el4.s390.rpm
cyrus-imapd-devel-2.2.12-15.el4.s390.rpm
cyrus-imapd-murder-2.2.12-15.el4.s390.rpm
cyrus-imapd-nntp-2.2.12-15.el4.s390.rpm
cyrus-imapd-utils-2.2.12-15.el4.s390.rpm
perl-Cyrus-2.2.12-15.el4.s390.rpm

s390x:
cyrus-imapd-2.2.12-15.el4.s390x.rpm
cyrus-imapd-debuginfo-2.2.12-15.el4.s390x.rpm
cyrus-imapd-devel-2.2.12-15.el4.s390x.rpm
cyrus-imapd-murder-2.2.12-15.el4.s390x.rpm
cyrus-imapd-nntp-2.2.12-15.el4.s390x.rpm
cyrus-imapd-utils-2.2.12-15.el4.s390x.rpm
perl-Cyrus-2.2.12-15.el4.s390x.rpm

x86_64:
cyrus-imapd-2.2.12-15.el4.x86_64.rpm
cyrus-imapd-debuginfo-2.2.12-15.el4.x86_64.rpm
cyrus-imapd-devel-2.2.12-15.el4.x86_64.rpm
cyrus-imapd-murder-2.2.12-15.el4.x86_64.rpm
cyrus-imapd-nntp-2.2.12-15.el4.x86_64.rpm
cyrus-imapd-utils-2.2.12-15.el4.x86_64.rpm
perl-Cyrus-2.2.12-15.el4.x86_64.rpm

Red Hat Enterprise Linux Desktop version 4:

Source:
ftp://updates.redhat.com/enterprise/4Desktop/en/os/SRPMS/cyrus-imapd-2.2.12-15.el4.src.rpm

i386:
cyrus-imapd-2.2.12-15.el4.i386.rpm
cyrus-imapd-debuginfo-2.2.12-15.el4.i386.rpm
cyrus-imapd-devel-2.2.12-15.el4.i386.rpm
cyrus-imapd-murder-2.2.12-15.el4.i386.rpm
cyrus-imapd-nntp-2.2.12-15.el4.i386.rpm
cyrus-imapd-utils-2.2.12-15.el4.i386.rpm
perl-Cyrus-2.2.12-15.el4.i386.rpm

x86_64:
cyrus-imapd-2.2.12-15.el4.x86_64.rpm
cyrus-imapd-debuginfo-2.2.12-15.el4.x86_64.rpm
cyrus-imapd-devel-2.2.12-15.el4.x86_64.rpm
cyrus-imapd-murder-2.2.12-15.el4.x86_64.rpm
cyrus-imapd-nntp-2.2.12-15.el4.x86_64.rpm
cyrus-imapd-utils-2.2.12-15.el4.x86_64.rpm
perl-Cyrus-2.2.12-15.el4.x86_64.rpm

Red Hat Enterprise Linux ES version 4:

Source:
ftp://updates.redhat.com/enterprise/4ES/en/os/SRPMS/cyrus-imapd-2.2.12-15.el4.src.rpm

i386:
cyrus-imapd-2.2.12-15.el4.i386.rpm
cyrus-imapd-debuginfo-2.2.12-15.el4.i386.rpm
cyrus-imapd-devel-2.2.12-15.el4.i386.rpm
cyrus-imapd-murder-2.2.12-15.el4.i386.rpm
cyrus-imapd-nntp-2.2.12-15.el4.i386.rpm
cyrus-imapd-utils-2.2.12-15.el4.i386.rpm
perl-Cyrus-2.2.12-15.el4.i386.rpm

ia64:
cyrus-imapd-2.2.12-15.el4.ia64.rpm
cyrus-imapd-debuginfo-2.2.12-15.el4.ia64.rpm
cyrus-imapd-devel-2.2.12-15.el4.ia64.rpm
cyrus-imapd-murder-2.2.12-15.el4.ia64.rpm
cyrus-imapd-nntp-2.2.12-15.el4.ia64.rpm
cyrus-imapd-utils-2.2.12-15.el4.ia64.rpm
perl-Cyrus-2.2.12-15.el4.ia64.rpm

x86_64:
cyrus-imapd-2.2.12-15.el4.x86_64.rpm
cyrus-imapd-debuginfo-2.2.12-15.el4.x86_64.rpm
cyrus-imapd-devel-2.2.12-15.el4.x86_64.rpm
cyrus-imapd-murder-2.2.12-15.el4.x86_64.rpm
cyrus-imapd-nntp-2.2.12-15.el4.x86_64.rpm
cyrus-imapd-utils-2.2.12-15.el4.x86_64.rpm
perl-Cyrus-2.2.12-15.el4.x86_64.rpm

Red Hat Enterprise Linux WS version 4:

Source:
ftp://updates.redhat.com/enterprise/4WS/en/os/SRPMS/cyrus-imapd-2.2.12-15.el4.src.rpm

i386:
cyrus-imapd-2.2.12-15.el4.i386.rpm
cyrus-imapd-debuginfo-2.2.12-15.el4.i386.rpm
cyrus-imapd-devel-2.2.12-15.el4.i386.rpm
cyrus-imapd-murder-2.2.12-15.el4.i386.rpm
cyrus-imapd-nntp-2.2.12-15.el4.i386.rpm
cyrus-imapd-utils-2.2.12-15.el4.i386.rpm
perl-Cyrus-2.2.12-15.el4.i386.rpm

ia64:
cyrus-imapd-2.2.12-15.el4.ia64.rpm
cyrus-imapd-debuginfo-2.2.12-15.el4.ia64.rpm
cyrus-imapd-devel-2.2.12-15.el4.ia64.rpm
cyrus-imapd-murder-2.2.12-15.el4.ia64.rpm
cyrus-imapd-nntp-2.2.12-15.el4.ia64.rpm
cyrus-imapd-utils-2.2.12-15.el4.ia64.rpm
perl-Cyrus-2.2.12-15.el4.ia64.rpm

x86_64:
cyrus-imapd-2.2.12-15.el4.x86_64.rpm
cyrus-imapd-debuginfo-2.2.12-15.el4.x86_64.rpm
cyrus-imapd-devel-2.2.12-15.el4.x86_64.rpm
cyrus-imapd-murder-2.2.12-15.el4.x86_64.rpm
cyrus-imapd-nntp-2.2.12-15.el4.x86_64.rpm
cyrus-imapd-utils-2.2.12-15.el4.x86_64.rpm
perl-Cyrus-2.2.12-15.el4.x86_64.rpm

RHEL Desktop Workstation (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/cyrus-imapd-2.3.7-7.el5_6.4.src.rpm

i386:
cyrus-imapd-2.3.7-7.el5_6.4.i386.rpm
cyrus-imapd-debuginfo-2.3.7-7.el5_6.4.i386.rpm
cyrus-imapd-devel-2.3.7-7.el5_6.4.i386.rpm
cyrus-imapd-perl-2.3.7-7.el5_6.4.i386.rpm
cyrus-imapd-utils-2.3.7-7.el5_6.4.i386.rpm

x86_64:
cyrus-imapd-2.3.7-7.el5_6.4.x86_64.rpm
cyrus-imapd-debuginfo-2.3.7-7.el5_6.4.i386.rpm
cyrus-imapd-debuginfo-2.3.7-7.el5_6.4.x86_64.rpm
cyrus-imapd-devel-2.3.7-7.el5_6.4.i386.rpm
cyrus-imapd-devel-2.3.7-7.el5_6.4.x86_64.rpm
cyrus-imapd-perl-2.3.7-7.el5_6.4.x86_64.rpm
cyrus-imapd-utils-2.3.7-7.el5_6.4.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/cyrus-imapd-2.3.7-7.el5_6.4.src.rpm

i386:
cyrus-imapd-2.3.7-7.el5_6.4.i386.rpm
cyrus-imapd-debuginfo-2.3.7-7.el5_6.4.i386.rpm
cyrus-imapd-devel-2.3.7-7.el5_6.4.i386.rpm
cyrus-imapd-perl-2.3.7-7.el5_6.4.i386.rpm
cyrus-imapd-utils-2.3.7-7.el5_6.4.i386.rpm

ia64:
cyrus-imapd-2.3.7-7.el5_6.4.ia64.rpm
cyrus-imapd-debuginfo-2.3.7-7.el5_6.4.ia64.rpm
cyrus-imapd-devel-2.3.7-7.el5_6.4.ia64.rpm
cyrus-imapd-perl-2.3.7-7.el5_6.4.ia64.rpm
cyrus-imapd-utils-2.3.7-7.el5_6.4.ia64.rpm

ppc:
cyrus-imapd-2.3.7-7.el5_6.4.ppc.rpm
cyrus-imapd-debuginfo-2.3.7-7.el5_6.4.ppc.rpm
cyrus-imapd-debuginfo-2.3.7-7.el5_6.4.ppc64.rpm
cyrus-imapd-devel-2.3.7-7.el5_6.4.ppc.rpm
cyrus-imapd-devel-2.3.7-7.el5_6.4.ppc64.rpm
cyrus-imapd-perl-2.3.7-7.el5_6.4.ppc.rpm
cyrus-imapd-utils-2.3.7-7.el5_6.4.ppc.rpm

s390x:
cyrus-imapd-2.3.7-7.el5_6.4.s390x.rpm
cyrus-imapd-debuginfo-2.3.7-7.el5_6.4.s390.rpm
cyrus-imapd-debuginfo-2.3.7-7.el5_6.4.s390x.rpm
cyrus-imapd-devel-2.3.7-7.el5_6.4.s390.rpm
cyrus-imapd-devel-2.3.7-7.el5_6.4.s390x.rpm
cyrus-imapd-perl-2.3.7-7.el5_6.4.s390x.rpm
cyrus-imapd-utils-2.3.7-7.el5_6.4.s390x.rpm

x86_64:
cyrus-imapd-2.3.7-7.el5_6.4.x86_64.rpm
cyrus-imapd-debuginfo-2.3.7-7.el5_6.4.i386.rpm
cyrus-imapd-debuginfo-2.3.7-7.el5_6.4.x86_64.rpm
cyrus-imapd-devel-2.3.7-7.el5_6.4.i386.rpm
cyrus-imapd-devel-2.3.7-7.el5_6.4.x86_64.rpm
cyrus-imapd-perl-2.3.7-7.el5_6.4.x86_64.rpm
cyrus-imapd-utils-2.3.7-7.el5_6.4.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server-6.1.z/en/os/SRPMS/cyrus-imapd-2.3.16-6.el6_1.2.src.rpm

i386:
cyrus-imapd-2.3.16-6.el6_1.2.i686.rpm
cyrus-imapd-debuginfo-2.3.16-6.el6_1.2.i686.rpm
cyrus-imapd-utils-2.3.16-6.el6_1.2.i686.rpm

ppc64:
cyrus-imapd-2.3.16-6.el6_1.2.ppc64.rpm
cyrus-imapd-debuginfo-2.3.16-6.el6_1.2.ppc64.rpm
cyrus-imapd-utils-2.3.16-6.el6_1.2.ppc64.rpm

s390x:
cyrus-imapd-2.3.16-6.el6_1.2.s390x.rpm
cyrus-imapd-debuginfo-2.3.16-6.el6_1.2.s390x.rpm
cyrus-imapd-utils-2.3.16-6.el6_1.2.s390x.rpm

x86_64:
cyrus-imapd-2.3.16-6.el6_1.2.x86_64.rpm
cyrus-imapd-debuginfo-2.3.16-6.el6_1.2.x86_64.rpm
cyrus-imapd-utils-2.3.16-6.el6_1.2.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server-6.1.z/en/os/SRPMS/cyrus-imapd-2.3.16-6.el6_1.2.src.rpm

i386:
cyrus-imapd-debuginfo-2.3.16-6.el6_1.2.i686.rpm
cyrus-imapd-devel-2.3.16-6.el6_1.2.i686.rpm

ppc64:
cyrus-imapd-debuginfo-2.3.16-6.el6_1.2.ppc.rpm
cyrus-imapd-debuginfo-2.3.16-6.el6_1.2.ppc64.rpm
cyrus-imapd-devel-2.3.16-6.el6_1.2.ppc.rpm
cyrus-imapd-devel-2.3.16-6.el6_1.2.ppc64.rpm

s390x:
cyrus-imapd-debuginfo-2.3.16-6.el6_1.2.s390.rpm
cyrus-imapd-debuginfo-2.3.16-6.el6_1.2.s390x.rpm
cyrus-imapd-devel-2.3.16-6.el6_1.2.s390.rpm
cyrus-imapd-devel-2.3.16-6.el6_1.2.s390x.rpm

x86_64:
cyrus-imapd-debuginfo-2.3.16-6.el6_1.2.i686.rpm
cyrus-imapd-debuginfo-2.3.16-6.el6_1.2.x86_64.rpm
cyrus-imapd-devel-2.3.16-6.el6_1.2.i686.rpm
cyrus-imapd-devel-2.3.16-6.el6_1.2.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation-6.1.z/en/os/SRPMS/cyrus-imapd-2.3.16-6.el6_1.2.src.rpm

i386:
cyrus-imapd-2.3.16-6.el6_1.2.i686.rpm
cyrus-imapd-debuginfo-2.3.16-6.el6_1.2.i686.rpm
cyrus-imapd-utils-2.3.16-6.el6_1.2.i686.rpm

x86_64:
cyrus-imapd-2.3.16-6.el6_1.2.x86_64.rpm
cyrus-imapd-debuginfo-2.3.16-6.el6_1.2.x86_64.rpm
cyrus-imapd-utils-2.3.16-6.el6_1.2.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation-6.1.z/en/os/SRPMS/cyrus-imapd-2.3.16-6.el6_1.2.src.rpm

i386:
cyrus-imapd-debuginfo-2.3.16-6.el6_1.2.i686.rpm
cyrus-imapd-devel-2.3.16-6.el6_1.2.i686.rpm

x86_64:
cyrus-imapd-debuginfo-2.3.16-6.el6_1.2.i686.rpm
cyrus-imapd-debuginfo-2.3.16-6.el6_1.2.x86_64.rpm
cyrus-imapd-devel-2.3.16-6.el6_1.2.i686.rpm
cyrus-imapd-devel-2.3.16-6.el6_1.2.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

7. References:

https://www.redhat.com/security/data/cve/CVE-2011-1926.html
https://access.redhat.com/security/updates/classification/#moderate

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2011 Red Hat, Inc.
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