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Category:   Application (E-mail Server)  >   Postfix Vendors:   Postfix.org
(Red Hat Issues Fix) Postfix Plaintext to TLS Switching Error Lets Remote Users Inject Plaintext Commands
SecurityTracker Alert ID:  1025302
SecurityTracker URL:  http://securitytracker.com/id/1025302
CVE Reference:   CVE-2011-0411   (Links to External Site)
Date:  Apr 7 2011
Impact:   Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): prior to 2.8.0
Description:   A vulnerability was reported in Postfix. A remote user can inject plaintext commands.

A remote user with the ability to conduct a man-in-the-middle attack can inject arbitrary plaintext before the SMTP connection switches to SMTP over TLS. The plaintext will be interpreted by the remote mail server as potential commands.

Wietse Venema reported this vulnerability.

Impact:   A remote user can inject plaintext commands.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2011-0423.html

Vendor URL:  www.postfix.org/CVE-2011-0411.html (Links to External Site)
Cause:   Access control error, State error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  6

Message History:   This archive entry is a follow-up to the message listed below.
Mar 9 2011 Postfix Plaintext to TLS Switching Error Lets Remote Users Inject Plaintext Commands



 Source Message Contents

Subject:  [RHSA-2011:0423-01] Moderate: postfix security update

-----BEGIN PGP SIGNED MESSAGE-----
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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: postfix security update
Advisory ID:       RHSA-2011:0423-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2011-0423.html
Issue date:        2011-04-06
CVE Names:         CVE-2011-0411 
=====================================================================

1. Summary:

Updated postfix packages that fix one security issue are now available for
Red Hat Enterprise Linux 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:

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) - 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 Workstation (v. 6) - i386, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64

3. Description:

Postfix is a Mail Transport Agent (MTA), supporting LDAP, SMTP AUTH (SASL),
and TLS.

It was discovered that Postfix did not flush the received SMTP commands
buffer after switching to TLS encryption for an SMTP session. A
man-in-the-middle attacker could use this flaw to inject SMTP commands into
a victim's session during the plain text phase. This would lead to those
commands being processed by Postfix after TLS encryption is enabled,
possibly allowing the attacker to steal the victim's mail or authentication
credentials. (CVE-2011-0411)

Red Hat would like to thank the CERT/CC for reporting CVE-2011-0411. The
CERT/CC acknowledges Wietse Venema as the original reporter.

Users of Postfix are advised to upgrade to these updated packages, which
contain a backported patch to resolve this issue. After installing this
update, the postfix service 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/):

674814 - CVE-2011-0411 postfix: SMTP commands injection during plaintext to TLS session switch

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/postfix-2.6.6-2.1.el6_0.src.rpm

i386:
postfix-2.6.6-2.1.el6_0.i686.rpm
postfix-debuginfo-2.6.6-2.1.el6_0.i686.rpm

x86_64:
postfix-2.6.6-2.1.el6_0.x86_64.rpm
postfix-debuginfo-2.6.6-2.1.el6_0.x86_64.rpm

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

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/postfix-2.6.6-2.1.el6_0.src.rpm

i386:
postfix-debuginfo-2.6.6-2.1.el6_0.i686.rpm
postfix-perl-scripts-2.6.6-2.1.el6_0.i686.rpm

x86_64:
postfix-debuginfo-2.6.6-2.1.el6_0.x86_64.rpm
postfix-perl-scripts-2.6.6-2.1.el6_0.x86_64.rpm

Red Hat Enterprise Linux HPC Node (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/postfix-2.6.6-2.1.el6_0.src.rpm

x86_64:
postfix-2.6.6-2.1.el6_0.x86_64.rpm
postfix-debuginfo-2.6.6-2.1.el6_0.x86_64.rpm

Red Hat Enterprise Linux HPC Node Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/postfix-2.6.6-2.1.el6_0.src.rpm

x86_64:
postfix-debuginfo-2.6.6-2.1.el6_0.x86_64.rpm
postfix-perl-scripts-2.6.6-2.1.el6_0.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/postfix-2.6.6-2.1.el6_0.src.rpm

i386:
postfix-2.6.6-2.1.el6_0.i686.rpm
postfix-debuginfo-2.6.6-2.1.el6_0.i686.rpm

ppc64:
postfix-2.6.6-2.1.el6_0.ppc64.rpm
postfix-debuginfo-2.6.6-2.1.el6_0.ppc64.rpm

s390x:
postfix-2.6.6-2.1.el6_0.s390x.rpm
postfix-debuginfo-2.6.6-2.1.el6_0.s390x.rpm

x86_64:
postfix-2.6.6-2.1.el6_0.x86_64.rpm
postfix-debuginfo-2.6.6-2.1.el6_0.x86_64.rpm

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

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/postfix-2.6.6-2.1.el6_0.src.rpm

i386:
postfix-debuginfo-2.6.6-2.1.el6_0.i686.rpm
postfix-perl-scripts-2.6.6-2.1.el6_0.i686.rpm

ppc64:
postfix-debuginfo-2.6.6-2.1.el6_0.ppc64.rpm
postfix-perl-scripts-2.6.6-2.1.el6_0.ppc64.rpm

s390x:
postfix-debuginfo-2.6.6-2.1.el6_0.s390x.rpm
postfix-perl-scripts-2.6.6-2.1.el6_0.s390x.rpm

x86_64:
postfix-debuginfo-2.6.6-2.1.el6_0.x86_64.rpm
postfix-perl-scripts-2.6.6-2.1.el6_0.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/postfix-2.6.6-2.1.el6_0.src.rpm

i386:
postfix-2.6.6-2.1.el6_0.i686.rpm
postfix-debuginfo-2.6.6-2.1.el6_0.i686.rpm

x86_64:
postfix-2.6.6-2.1.el6_0.x86_64.rpm
postfix-debuginfo-2.6.6-2.1.el6_0.x86_64.rpm

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

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/postfix-2.6.6-2.1.el6_0.src.rpm

i386:
postfix-debuginfo-2.6.6-2.1.el6_0.i686.rpm
postfix-perl-scripts-2.6.6-2.1.el6_0.i686.rpm

x86_64:
postfix-debuginfo-2.6.6-2.1.el6_0.x86_64.rpm
postfix-perl-scripts-2.6.6-2.1.el6_0.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-2011-0411.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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