-------------------------------------------------------------------------------- Fedora EPEL Update Notification FEDORA-EPEL-2015-13c5827d5c 2015-10-26 18:45:06.961304 --------------------------------------------------------------------------------
Name : opensmtpd Product : Fedora EPEL 7 Version : 5.7.3p1 Release : 1.el7 URL : http://www.opensmtpd.org/ Summary : Free implementation of the server-side SMTP protocol as defined by RFC 5321 Description : OpenSMTPD is a FREE implementation of the server-side SMTP protocol as defined by RFC 5321, with some additional standard extensions. It allows ordinary machines to exchange e-mails with other systems speaking the SMTP protocol. Started out of dissatisfaction with other implementations, OpenSMTPD nowadays is a fairly complete SMTP implementation. OpenSMTPD is primarily developed by Gilles Chehade, Eric Faurot and Charles Longeau; with contributions from various OpenBSD hackers. OpenSMTPD is part of the OpenBSD Project. The software is freely usable and re-usable by everyone under an ISC license.
This package uses standard "alternatives" mechanism, you may call "/usr/sbin/alternatives --set mta /usr/sbin/sendmail.opensmtpd" if you want to switch to OpenSMTPD MTA immediately after install, and "/usr/sbin/alternatives --set mta /usr/sbin/sendmail.sendmail" to revert back to Sendmail as a default mail daemon.
-------------------------------------------------------------------------------- Update Information:
Issues fixed in this release (since 5.7.2): - fix an mda buffer truncation bug which allows a user to create forward files that pass session checks but fail delivery later down the chain, within the user mda; - fix remote buffer overflow in unprivileged pony process; - reworked offline enqueue to better protect against hardlink attacks. ---- Several vulnerabilities have been fixed in OpenSMTPD 5.7.2: - an oversight in the portable version of fgetln() that allows attackers to read and write out-of-bounds memory; - multiple denial-of- service vulnerabilities that allow local users to kill or hang OpenSMTPD; - a stack-based buffer overflow that allows local users to crash OpenSMTPD, or execute arbitrary code as the non-chrooted _smtpd user; - a hardlink attack (or race-conditioned symlink attack) that allows local users to unset the chflags() of arbitrary files; - a hardlink attack that allows local users to read the first line of arbitrary files (for example, root's hash from /etc/master.passwd); - a denial-of-service vulnerability that allows remote attackers to fill OpenSMTPD's queue or mailbox hard-disk partition; - an out- of-bounds memory read that allows remote attackers to crash OpenSMTPD, or leak information and defeat the ASLR protection; - a use-after-free vulnerability that allows remote attackers to crash OpenSMTPD, or execute arbitrary code as the non-chrooted _smtpd user; Further details can be found in Qualys' audit report: http://seclists.org/oss-sec/2015/q4/17 MITRE has assigned one CVE for the use-after-free vulnerability; additional CVEs may be assigned: http://seclists.org/oss-sec/2015/q4/23 External References: https://www.opensmtpd.org/announces/release-5.7.2.txt http://seclists.org/oss- sec/2015/q4/17 -------------------------------------------------------------------------------- References:
[ 1 ] Bug #1268837 - opensmtpd-5.7.3 is available https://bugzilla.redhat.com/show_bug.cgi?id=1268837 [ 2 ] Bug #1268509 - opensmtpd: 5.7.2 release available https://bugzilla.redhat.com/show_bug.cgi?id=1268509 [ 3 ] Bug #1268795 - CVE-2015-7687 OpenSMTPD: multiple vulnerabilities fixed in 5.7.2 [epel-all] https://bugzilla.redhat.com/show_bug.cgi?id=1268795 [ 4 ] Bug #1268858 - opensmtpd: Remotely triggerable buffer overflow vulnerability in filter_tx_io [epel-all] https://bugzilla.redhat.com/show_bug.cgi?id=1268858 --------------------------------------------------------------------------------
This update can be installed with the "yum" update programs. Use su -c 'yum update opensmtpd' at the command line. For more information, refer to "Managing Software with yum", available at https://docs.fedoraproject.org/yum/.
All packages are signed with the Fedora EPEL GPG key. More details on the GPG keys used by the Fedora Project can be found at https://fedoraproject.org/keys --------------------------------------------------------------------------------