RHSA-2015:1153 - Security Advisory

Topic

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.

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.

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

Affected Products

• Red Hat Enterprise Linux Server 7 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.7 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.6 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.5 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.4 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.3 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.2 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.1 x86_64
• Red Hat Enterprise Linux Server - AUS 7.7 x86_64
• Red Hat Enterprise Linux Server - AUS 7.6 x86_64
• Red Hat Enterprise Linux Server - AUS 7.4 x86_64
• Red Hat Enterprise Linux Server - AUS 7.3 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 7 x86_64
• Red Hat Enterprise Linux Workstation 7 x86_64
• Red Hat Enterprise Linux for IBM z Systems 7 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.7 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.6 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.5 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.4 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.3 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.2 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.1 s390x
• Red Hat Enterprise Linux for Power, big endian 7 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.7 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.6 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.5 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.4 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.3 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.2 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.1 ppc64
• Red Hat Enterprise Linux Server from RHUI 7 x86_64
• Red Hat Enterprise Linux Server - TUS 7.7 x86_64
• Red Hat Enterprise Linux Server - TUS 7.6 x86_64
• Red Hat Enterprise Linux Server - TUS 7.3 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 7 s390x
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 7.7 x86_64
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 7.6 x86_64
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 7.4 x86_64
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 7.3 x86_64
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 7.2 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support for IBM Power, big endian 7 ppc64

Fixes

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

CVEs

• CVE-2015-2775

References

• https://access.redhat.com/security/updates/classification/#moderate