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

Synopsis:          Moderate: mailman security and bug fix update
Advisory ID:       RHSA-2015:1153-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2015-1153.html
Issue date:        2015-06-23
CVE Names:         CVE-2015-2775 
=====================================================================

1. Summary:

Updated mailman packages that fix one security issue and several bugs are
now available for Red Hat Enterprise Linux 7.

Red Hat Product Security 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 Server (v. 7) - ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - x86_64

3. Description:

Mailman is a program used to help manage email discussion lists.

It was found that mailman did not sanitize the list name before passing it
to certain MTAs. A local attacker could use this flaw to execute arbitrary
code as the user running mailman. (CVE-2015-2775)

This update also fixes the following bugs:

* Previously, it was impossible to configure Mailman in a way that
Domain-based Message Authentication, Reporting & Conformance (DMARC) would
recognize Sender alignment for Domain Key Identified Mail (DKIM)
signatures. Consequently, Mailman list subscribers that belonged to a mail
server with a "reject" policy for DMARC, such as yahoo.com or AOL.com, were
unable to receive Mailman forwarded messages from senders residing in any
domain that provided DKIM signatures. With this update, domains with a
"reject" DMARC policy are recognized correctly, and Mailman list
administrators are able to configure the way these messages are handled. As
a result, after a proper configuration, subscribers now correctly receive
Mailman forwarded messages in this scenario. (BZ#1229288)

* Previously, the /etc/mailman file had incorrectly set permissions, which
in some cases caused removing Mailman lists to fail with a "'NoneType'
object has no attribute 'close'" message. With this update, the permissions
value for /etc/mailman is correctly set to 2775 instead of 0755, and
removing Mailman lists now works as expected. (BZ#1229307)

* Prior to this update, the mailman utility incorrectly installed the
tmpfiles configuration in the /etc/tmpfiles.d/ directory. As a consequence,
changes made to mailman tmpfiles configuration were overwritten if the
mailman packages were reinstalled or updated. The mailman utility now
installs the tmpfiles configuration in the /usr/lib/tmpfiles.d/ directory,
and changes made to them by the user are preserved on reinstall or update.
(BZ#1229306)

All mailman users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

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

1208059 - CVE-2015-2775 mailman: directory traversal in MTA transports that deliver programmatically
1229288 - Yahoo.com and AOL DMARC reject policies cripples Mailman-2.1.12 - update to newer release
1229307 - /etc/mailman has wrong permissions 0755 instead of 2775

6. Package List:

Red Hat Enterprise Linux Server (v. 7):

Source:
mailman-2.1.15-21.el7_1.src.rpm

ppc64:
mailman-2.1.15-21.el7_1.ppc64.rpm
mailman-debuginfo-2.1.15-21.el7_1.ppc64.rpm

s390x:
mailman-2.1.15-21.el7_1.s390x.rpm
mailman-debuginfo-2.1.15-21.el7_1.s390x.rpm

x86_64:
mailman-2.1.15-21.el7_1.x86_64.rpm
mailman-debuginfo-2.1.15-21.el7_1.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
mailman-2.1.15-21.ael7b_1.src.rpm

ppc64le:
mailman-2.1.15-21.ael7b_1.ppc64le.rpm
mailman-debuginfo-2.1.15-21.ael7b_1.ppc64le.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
mailman-2.1.15-21.el7_1.src.rpm

x86_64:
mailman-2.1.15-21.el7_1.x86_64.rpm
mailman-debuginfo-2.1.15-21.el7_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/

7. References:

https://access.redhat.com/security/cve/CVE-2015-2775
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 2015 Red Hat, Inc.
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