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Category:   Application (E-mail Server)  >   Postfix Vendors:   Postfix.org
(Red Hat Issues Fix) Postfix SASL Authentication Heap Overflow Lets Remote Users Deny Service
SecurityTracker Alert ID:  1025584
SecurityTracker URL:  http://securitytracker.com/id/1025584
CVE Reference:   CVE-2011-1720   (Links to External Site)
Date:  May 31 2011
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to versions 2.5.13, 2.6.10, 2.7.4, 2.8.3
Description:   A vulnerability was reported in Postfix. A remote user can cause denial of service conditions.

A remote user can send a specially crafted SASL authentication request to trigger a heap overflow and cause the target service to crash. Systems using the Cyrus SASL library with authentication mechanisms other than PLAN and LOGIN are affected.

Examples of affected Cyrus SASL authentication methods include CRAM-MD5, DIGEST-MD5, EXTERNAL, GSSAPI, KERBEROS_V4, NTLM, OTP, PASSDSS-3DES-1, and SRP.

Remote code execution may be possible but was not confirmed in the report.

Thomas Jarosch of Intra2net AG reported this vulnerability.

Impact:   A remote user can cause the target service to crash.
Solution:   Red Hat has issued a fix.

Red Hat's advisory is available at:

https://rhn.redhat.com/errata/RHSA-2011-0843.html

Vendor URL:  www.postfix.org/CVE-2011-1720.html (Links to External Site)
Cause:   Boundary 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.
May 11 2011 Postfix SASL Authentication Heap Overflow Lets Remote Users Deny Service



 Source Message Contents

Subject:  [RHSA-2011:0843-01] Moderate: postfix security update

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

Synopsis:          Moderate: postfix security update
Advisory ID:       RHSA-2011:0843-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2011-0843.html
Issue date:        2011-05-31
CVE Names:         CVE-2011-1720 
=====================================================================

1. Summary:

Updated postfix 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:

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 (v. 5 client) - i386, x86_64
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 Desktop version 4 - i386, x86_64
Red Hat Enterprise Linux ES version 4 - i386, ia64, 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 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:

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

A heap-based buffer over-read flaw was found in the way Postfix performed
SASL handlers management for SMTP sessions, when Cyrus SASL authentication
was enabled. A remote attacker could use this flaw to cause the Postfix
smtpd server to crash via a specially-crafted SASL authentication request.
The smtpd process was automatically restarted by the postfix master process
after the time configured with service_throttle_time elapsed.
(CVE-2011-1720)

Note: Cyrus SASL authentication for Postfix is not enabled by default.

Red Hat would like to thank the CERT/CC for reporting this issue. Upstream
acknowledges Thomas Jarosch of Intra2net AG 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/):

699035 - CVE-2011-1720 postfix (smtpd): Crash due to improper management of SASL handlers for SMTP sessions

6. Package List:

Red Hat Enterprise Linux AS version 4:

Source:
ftp://updates.redhat.com/enterprise/4AS/en/os/SRPMS/postfix-2.2.10-1.5.el4.src.rpm

i386:
postfix-2.2.10-1.5.el4.i386.rpm
postfix-debuginfo-2.2.10-1.5.el4.i386.rpm
postfix-pflogsumm-2.2.10-1.5.el4.i386.rpm

ia64:
postfix-2.2.10-1.5.el4.ia64.rpm
postfix-debuginfo-2.2.10-1.5.el4.ia64.rpm
postfix-pflogsumm-2.2.10-1.5.el4.ia64.rpm

ppc:
postfix-2.2.10-1.5.el4.ppc.rpm
postfix-debuginfo-2.2.10-1.5.el4.ppc.rpm
postfix-pflogsumm-2.2.10-1.5.el4.ppc.rpm

s390:
postfix-2.2.10-1.5.el4.s390.rpm
postfix-debuginfo-2.2.10-1.5.el4.s390.rpm
postfix-pflogsumm-2.2.10-1.5.el4.s390.rpm

s390x:
postfix-2.2.10-1.5.el4.s390x.rpm
postfix-debuginfo-2.2.10-1.5.el4.s390x.rpm
postfix-pflogsumm-2.2.10-1.5.el4.s390x.rpm

x86_64:
postfix-2.2.10-1.5.el4.x86_64.rpm
postfix-debuginfo-2.2.10-1.5.el4.x86_64.rpm
postfix-pflogsumm-2.2.10-1.5.el4.x86_64.rpm

Red Hat Enterprise Linux Desktop version 4:

Source:
ftp://updates.redhat.com/enterprise/4Desktop/en/os/SRPMS/postfix-2.2.10-1.5.el4.src.rpm

i386:
postfix-2.2.10-1.5.el4.i386.rpm
postfix-debuginfo-2.2.10-1.5.el4.i386.rpm
postfix-pflogsumm-2.2.10-1.5.el4.i386.rpm

x86_64:
postfix-2.2.10-1.5.el4.x86_64.rpm
postfix-debuginfo-2.2.10-1.5.el4.x86_64.rpm
postfix-pflogsumm-2.2.10-1.5.el4.x86_64.rpm

Red Hat Enterprise Linux ES version 4:

Source:
ftp://updates.redhat.com/enterprise/4ES/en/os/SRPMS/postfix-2.2.10-1.5.el4.src.rpm

i386:
postfix-2.2.10-1.5.el4.i386.rpm
postfix-debuginfo-2.2.10-1.5.el4.i386.rpm
postfix-pflogsumm-2.2.10-1.5.el4.i386.rpm

ia64:
postfix-2.2.10-1.5.el4.ia64.rpm
postfix-debuginfo-2.2.10-1.5.el4.ia64.rpm
postfix-pflogsumm-2.2.10-1.5.el4.ia64.rpm

x86_64:
postfix-2.2.10-1.5.el4.x86_64.rpm
postfix-debuginfo-2.2.10-1.5.el4.x86_64.rpm
postfix-pflogsumm-2.2.10-1.5.el4.x86_64.rpm

Red Hat Enterprise Linux WS version 4:

Source:
ftp://updates.redhat.com/enterprise/4WS/en/os/SRPMS/postfix-2.2.10-1.5.el4.src.rpm

i386:
postfix-2.2.10-1.5.el4.i386.rpm
postfix-debuginfo-2.2.10-1.5.el4.i386.rpm
postfix-pflogsumm-2.2.10-1.5.el4.i386.rpm

ia64:
postfix-2.2.10-1.5.el4.ia64.rpm
postfix-debuginfo-2.2.10-1.5.el4.ia64.rpm
postfix-pflogsumm-2.2.10-1.5.el4.ia64.rpm

x86_64:
postfix-2.2.10-1.5.el4.x86_64.rpm
postfix-debuginfo-2.2.10-1.5.el4.x86_64.rpm
postfix-pflogsumm-2.2.10-1.5.el4.x86_64.rpm

Red Hat Enterprise Linux Desktop (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/postfix-2.3.3-2.3.el5_6.src.rpm

i386:
postfix-2.3.3-2.3.el5_6.i386.rpm
postfix-debuginfo-2.3.3-2.3.el5_6.i386.rpm
postfix-pflogsumm-2.3.3-2.3.el5_6.i386.rpm

x86_64:
postfix-2.3.3-2.3.el5_6.x86_64.rpm
postfix-debuginfo-2.3.3-2.3.el5_6.x86_64.rpm
postfix-pflogsumm-2.3.3-2.3.el5_6.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/postfix-2.3.3-2.3.el5_6.src.rpm

i386:
postfix-2.3.3-2.3.el5_6.i386.rpm
postfix-debuginfo-2.3.3-2.3.el5_6.i386.rpm
postfix-pflogsumm-2.3.3-2.3.el5_6.i386.rpm

ia64:
postfix-2.3.3-2.3.el5_6.ia64.rpm
postfix-debuginfo-2.3.3-2.3.el5_6.ia64.rpm
postfix-pflogsumm-2.3.3-2.3.el5_6.ia64.rpm

ppc:
postfix-2.3.3-2.3.el5_6.ppc.rpm
postfix-debuginfo-2.3.3-2.3.el5_6.ppc.rpm
postfix-pflogsumm-2.3.3-2.3.el5_6.ppc.rpm

s390x:
postfix-2.3.3-2.3.el5_6.s390x.rpm
postfix-debuginfo-2.3.3-2.3.el5_6.s390x.rpm
postfix-pflogsumm-2.3.3-2.3.el5_6.s390x.rpm

x86_64:
postfix-2.3.3-2.3.el5_6.x86_64.rpm
postfix-debuginfo-2.3.3-2.3.el5_6.x86_64.rpm
postfix-pflogsumm-2.3.3-2.3.el5_6.x86_64.rpm

Red Hat Enterprise Linux Desktop (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client-6.1.z/en/os/SRPMS/postfix-2.6.6-2.2.el6_1.src.rpm

i386:
postfix-2.6.6-2.2.el6_1.i686.rpm
postfix-debuginfo-2.6.6-2.2.el6_1.i686.rpm

x86_64:
postfix-2.6.6-2.2.el6_1.x86_64.rpm
postfix-debuginfo-2.6.6-2.2.el6_1.x86_64.rpm

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

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client-6.1.z/en/os/SRPMS/postfix-2.6.6-2.2.el6_1.src.rpm

i386:
postfix-debuginfo-2.6.6-2.2.el6_1.i686.rpm
postfix-perl-scripts-2.6.6-2.2.el6_1.i686.rpm

x86_64:
postfix-debuginfo-2.6.6-2.2.el6_1.x86_64.rpm
postfix-perl-scripts-2.6.6-2.2.el6_1.x86_64.rpm

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

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode-6.1.z/en/os/SRPMS/postfix-2.6.6-2.2.el6_1.src.rpm

x86_64:
postfix-2.6.6-2.2.el6_1.x86_64.rpm
postfix-debuginfo-2.6.6-2.2.el6_1.x86_64.rpm

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

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode-6.1.z/en/os/SRPMS/postfix-2.6.6-2.2.el6_1.src.rpm

x86_64:
postfix-debuginfo-2.6.6-2.2.el6_1.x86_64.rpm
postfix-perl-scripts-2.6.6-2.2.el6_1.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/postfix-2.6.6-2.2.el6_1.src.rpm

i386:
postfix-2.6.6-2.2.el6_1.i686.rpm
postfix-debuginfo-2.6.6-2.2.el6_1.i686.rpm

ppc64:
postfix-2.6.6-2.2.el6_1.ppc64.rpm
postfix-debuginfo-2.6.6-2.2.el6_1.ppc64.rpm

s390x:
postfix-2.6.6-2.2.el6_1.s390x.rpm
postfix-debuginfo-2.6.6-2.2.el6_1.s390x.rpm

x86_64:
postfix-2.6.6-2.2.el6_1.x86_64.rpm
postfix-debuginfo-2.6.6-2.2.el6_1.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/postfix-2.6.6-2.2.el6_1.src.rpm

i386:
postfix-debuginfo-2.6.6-2.2.el6_1.i686.rpm
postfix-perl-scripts-2.6.6-2.2.el6_1.i686.rpm

ppc64:
postfix-debuginfo-2.6.6-2.2.el6_1.ppc64.rpm
postfix-perl-scripts-2.6.6-2.2.el6_1.ppc64.rpm

s390x:
postfix-debuginfo-2.6.6-2.2.el6_1.s390x.rpm
postfix-perl-scripts-2.6.6-2.2.el6_1.s390x.rpm

x86_64:
postfix-debuginfo-2.6.6-2.2.el6_1.x86_64.rpm
postfix-perl-scripts-2.6.6-2.2.el6_1.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/postfix-2.6.6-2.2.el6_1.src.rpm

i386:
postfix-2.6.6-2.2.el6_1.i686.rpm
postfix-debuginfo-2.6.6-2.2.el6_1.i686.rpm

x86_64:
postfix-2.6.6-2.2.el6_1.x86_64.rpm
postfix-debuginfo-2.6.6-2.2.el6_1.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/postfix-2.6.6-2.2.el6_1.src.rpm

i386:
postfix-debuginfo-2.6.6-2.2.el6_1.i686.rpm
postfix-perl-scripts-2.6.6-2.2.el6_1.i686.rpm

x86_64:
postfix-debuginfo-2.6.6-2.2.el6_1.x86_64.rpm
postfix-perl-scripts-2.6.6-2.2.el6_1.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-2011-1720.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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