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Red Hat: RHSA-2011:0422-01 Moderate: Postfix TLS Security Update

Calendar Apr 06, 2011 • User Avatar LinuxSecurity Advisories
4 - 7 min read
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Topics%20covered

Topics Covered

security advisory moderate Red Hat Postfix mail transport TLS issue
Updated postfix packages that fix two security issues are now available for Red Hat Enterprise Linux 4 and 5. The Red Hat Security Response Team has rated this update as having moderate [More...] 
====================================================================                   Red Hat Security Advisory

Synopsis:          Moderate: postfix security update
Advisory ID:       RHSA-2011:0422-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2011:0422.html
Issue date:        2011-04-06
CVE Names:         CVE-2008-2937 CVE-2011-0411 
====================================================================
1. Summary:

Updated postfix packages that fix two security issues are now available for
Red Hat Enterprise Linux 4 and 5.

The Red Hat Security Response Team has rated this update as having moderate
security impact. Common Vulnerability Scoring System (CVSS) base scores,
which give detailed severity ratings, are available for each vulnerability
from the CVE links 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 version 4 - i386, x86_64
Red Hat Enterprise Linux ES version 4 - i386, ia64, x86_64
Red Hat Enterprise Linux WS version 4 - i386, ia64, 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)

It was discovered that Postfix did not properly check the permissions of
users' mailbox files. A local attacker able to create files in the mail
spool directory could use this flaw to create mailbox files for other local
users, and be able to read mail delivered to those users. (CVE-2008-2937)

Red Hat would like to thank the CERT/CC for reporting CVE-2011-0411, and
Sebastian Krahmer of the SuSE Security Team for reporting CVE-2008-2937.
The CERT/CC acknowledges Wietse Venema as the original reporter of
CVE-2011-0411.

Users of Postfix are advised to upgrade to these updated packages, which
contain backported patches to resolve these issues. 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/):

456347 - CVE-2008-2937 postfix improper mailbox permissions
674814 - CVE-2011-0411 postfix: SMTP commands injection during plaintext to TLS session switch

6. Package List:

Red Hat Enterprise Linux AS version 4:

Source:

i386:
postfix-2.2.10-1.4.el4.i386.rpm
postfix-debuginfo-2.2.10-1.4.el4.i386.rpm
postfix-pflogsumm-2.2.10-1.4.el4.i386.rpm

ia64:
postfix-2.2.10-1.4.el4.ia64.rpm
postfix-debuginfo-2.2.10-1.4.el4.ia64.rpm
postfix-pflogsumm-2.2.10-1.4.el4.ia64.rpm

ppc:
postfix-2.2.10-1.4.el4.ppc.rpm
postfix-debuginfo-2.2.10-1.4.el4.ppc.rpm
postfix-pflogsumm-2.2.10-1.4.el4.ppc.rpm

s390:
postfix-2.2.10-1.4.el4.s390.rpm
postfix-debuginfo-2.2.10-1.4.el4.s390.rpm
postfix-pflogsumm-2.2.10-1.4.el4.s390.rpm

s390x:
postfix-2.2.10-1.4.el4.s390x.rpm
postfix-debuginfo-2.2.10-1.4.el4.s390x.rpm
postfix-pflogsumm-2.2.10-1.4.el4.s390x.rpm

x86_64:
postfix-2.2.10-1.4.el4.x86_64.rpm
postfix-debuginfo-2.2.10-1.4.el4.x86_64.rpm
postfix-pflogsumm-2.2.10-1.4.el4.x86_64.rpm

Red Hat Enterprise Linux Desktop version 4:

Source:

i386:
postfix-2.2.10-1.4.el4.i386.rpm
postfix-debuginfo-2.2.10-1.4.el4.i386.rpm
postfix-pflogsumm-2.2.10-1.4.el4.i386.rpm

x86_64:
postfix-2.2.10-1.4.el4.x86_64.rpm
postfix-debuginfo-2.2.10-1.4.el4.x86_64.rpm
postfix-pflogsumm-2.2.10-1.4.el4.x86_64.rpm

Red Hat Enterprise Linux ES version 4:

Source:

i386:
postfix-2.2.10-1.4.el4.i386.rpm
postfix-debuginfo-2.2.10-1.4.el4.i386.rpm
postfix-pflogsumm-2.2.10-1.4.el4.i386.rpm

ia64:
postfix-2.2.10-1.4.el4.ia64.rpm
postfix-debuginfo-2.2.10-1.4.el4.ia64.rpm
postfix-pflogsumm-2.2.10-1.4.el4.ia64.rpm

x86_64:
postfix-2.2.10-1.4.el4.x86_64.rpm
postfix-debuginfo-2.2.10-1.4.el4.x86_64.rpm
postfix-pflogsumm-2.2.10-1.4.el4.x86_64.rpm

Red Hat Enterprise Linux WS version 4:

Source:

i386:
postfix-2.2.10-1.4.el4.i386.rpm
postfix-debuginfo-2.2.10-1.4.el4.i386.rpm
postfix-pflogsumm-2.2.10-1.4.el4.i386.rpm

ia64:
postfix-2.2.10-1.4.el4.ia64.rpm
postfix-debuginfo-2.2.10-1.4.el4.ia64.rpm
postfix-pflogsumm-2.2.10-1.4.el4.ia64.rpm

x86_64:
postfix-2.2.10-1.4.el4.x86_64.rpm
postfix-debuginfo-2.2.10-1.4.el4.x86_64.rpm
postfix-pflogsumm-2.2.10-1.4.el4.x86_64.rpm

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

Source:

i386:
postfix-2.3.3-2.2.el5_6.i386.rpm
postfix-debuginfo-2.3.3-2.2.el5_6.i386.rpm
postfix-pflogsumm-2.3.3-2.2.el5_6.i386.rpm

x86_64:
postfix-2.3.3-2.2.el5_6.x86_64.rpm
postfix-debuginfo-2.3.3-2.2.el5_6.x86_64.rpm
postfix-pflogsumm-2.3.3-2.2.el5_6.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:

i386:
postfix-2.3.3-2.2.el5_6.i386.rpm
postfix-debuginfo-2.3.3-2.2.el5_6.i386.rpm
postfix-pflogsumm-2.3.3-2.2.el5_6.i386.rpm

ia64:
postfix-2.3.3-2.2.el5_6.ia64.rpm
postfix-debuginfo-2.3.3-2.2.el5_6.ia64.rpm
postfix-pflogsumm-2.3.3-2.2.el5_6.ia64.rpm

ppc:
postfix-2.3.3-2.2.el5_6.ppc.rpm
postfix-debuginfo-2.3.3-2.2.el5_6.ppc.rpm
postfix-pflogsumm-2.3.3-2.2.el5_6.ppc.rpm

s390x:
postfix-2.3.3-2.2.el5_6.s390x.rpm
postfix-debuginfo-2.3.3-2.2.el5_6.s390x.rpm
postfix-pflogsumm-2.3.3-2.2.el5_6.s390x.rpm

x86_64:
postfix-2.3.3-2.2.el5_6.x86_64.rpm
postfix-debuginfo-2.3.3-2.2.el5_6.x86_64.rpm
postfix-pflogsumm-2.3.3-2.2.el5_6.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://access.redhat.com/security/cve/CVE-2008-2937
https://access.redhat.com/security/cve/CVE-2011-0411
https://access.redhat.com/security/updates/classification#moderate

8. Contact:

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

Copyright 2011 Red Hat, Inc.

Red Hat: RHSA-2011:0422-01 Moderate: Postfix TLS Security Update

red hat
Calendar Grey April 6, 2011
Dist Redhat Esm H88
Red Hat's recent Postfix update tackles notable security threats. Essential for Linux email functionalities concerning TLS.
Updated postfix packages that fix two security issues are now available for Red Hat Enterprise Linux 4 and 5

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

Summary

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)
It was discovered that Postfix did not properly check the permissions of users' mailbox files. A local attacker able to create files in the mail spool directory could use this flaw to create mailbox files for other local users, and be able to read mail delivered to those users. (CVE-2008-2937)
Red Hat would like to thank the CERT/CC for reporting CVE-2011-0411, and Sebastian Krahmer of the SuSE Security Team for reporting CVE-2008-2937. The CERT/CC acknowledges Wietse Venema as the original reporter of CVE-2011-0411.
Users of Postfix are advised to upgrade to these updated packages, which contain backported patches to resolve these issues. After installing this update, the postfix service will be restarted automatically.

Topics%20covered

Topics Covered

security advisory moderate Red Hat Postfix mail transport TLS issue

References

https://access.redhat.com/security/cve/CVE-2008-2937 https://access.redhat.com/security/cve/CVE-2011-0411 https://access.redhat.com/security/updates/classification#moderate

Package List

Red Hat Enterprise Linux AS version 4:
Source:
i386: postfix-2.2.10-1.4.el4.i386.rpm postfix-debuginfo-2.2.10-1.4.el4.i386.rpm postfix-pflogsumm-2.2.10-1.4.el4.i386.rpm
ia64: postfix-2.2.10-1.4.el4.ia64.rpm postfix-debuginfo-2.2.10-1.4.el4.ia64.rpm postfix-pflogsumm-2.2.10-1.4.el4.ia64.rpm
ppc: postfix-2.2.10-1.4.el4.ppc.rpm postfix-debuginfo-2.2.10-1.4.el4.ppc.rpm postfix-pflogsumm-2.2.10-1.4.el4.ppc.rpm
s390: postfix-2.2.10-1.4.el4.s390.rpm postfix-debuginfo-2.2.10-1.4.el4.s390.rpm postfix-pflogsumm-2.2.10-1.4.el4.s390.rpm
s390x: postfix-2.2.10-1.4.el4.s390x.rpm postfix-debuginfo-2.2.10-1.4.el4.s390x.rpm postfix-pflogsumm-2.2.10-1.4.el4.s390x.rpm
x86_64: postfix-2.2.10-1.4.el4.x86_64.rpm postfix-debuginfo-2.2.10-1.4.el4.x86_64.rpm postfix-pflogsumm-2.2.10-1.4.el4.x86_64.rpm
Red Hat Enterprise Linux Desktop version 4:
Source:
i386: postfix-2.2.10-1.4.el4.i386.rpm postfix-debuginfo-2.2.10-1.4.el4.i386.rpm postfix-pflogsumm-2.2.10-1.4.el4.i386.rpm
x86_64: postfix-2.2.10-1.4.el4.x86_64.rpm postfix-debuginfo-2.2.10-1.4.el4.x86_64.rpm postfix-pflogsumm-2.2.10-1.4.el4.x86_64.rpm
Red Hat Enterprise Linux ES version 4:
Source:
i386: postfix-2.2.10-1.4.el4.i386.rpm postfix-debuginfo-2.2.10-1.4.el4.i386.rpm postfix-pflogsumm-2.2.10-1.4.el4.i386.rpm
ia64:

Read the Full Advisory


Advisory ID: RHSA-2011:0422-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2011:0422.html
Issue date: 2011-04-06

Topic

Updated postfix packages that fix two security issues are now available forRed Hat Enterprise Linux 4 and 5.The Red Hat Security Response Team has rated this update as having moderatesecurity impact. Common Vulnerability Scoring System (CVSS) base scores,which give detailed severity ratings, are available for each vulnerabilityfrom the CVE links in the References section.

Topics%20covered

Topics Covered

security advisory moderate Red Hat Postfix mail transport TLS issue

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 version 4 - i386, x86_64

Red Hat Enterprise Linux ES version 4 - i386, ia64, x86_64

Red Hat Enterprise Linux WS version 4 - i386, ia64, x86_64

Bugs Fixed

456347 - CVE-2008-2937 postfix improper mailbox permissions

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

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