Bug 12326

Gentoo has issued an advisory for this on January 16:
http://www.gentoo.org/security/en/glsa/glsa-201401-08.xml

They modified the default configuration in their package, so that appears to be the correct solution.  Also, IIRC, ntp 4.2.7 is a development branch.

URL: (none) => http://lwn.net/Vulnerabilities/580994/

https://bugzilla.redhat.com/show_bug.cgi?id=1047854#c8

Parts of that patch (ntpq-subs.c, ntp_request.c, ntp_scanner.c) has to be backported manually.

I'd vote for a fix like:

https://bugzilla.redhat.com/show_bug.cgi?id=1047854#c5

But this has also to be added to the /etc/ntp.conf file by force in the %post script if so, unless the user adds it him/herself by looking at a possible /etc/ntp.conf.rpmnew file.

CC: (none) => oe
Blocks: 11726 => (none)

I think adjusting the default configuration (looks like RedHat's already has) and giving instructions in the advisory (like Gentoo did) would be sufficient.  The patch completely removes the monlist functionality, which isn't necessary.

Blocks: (none) => 11726

I've added this to the default ntp.conf in SVN (from Fedora):
# Permit time synchronization with our time source, but do not
# permit the source to query or modify the service on this system.
restrict default nomodify notrap nopeer noquery

Modified packages uploaded for Mageia 3 and Cauldron.

Advisory:
========================

Updated ntp packages work around security vulnerability:

The "monlist" command of the NTP protocol is currently abused in a DDoS
reflection attack. This is done by spoofing packets from addresses to which
the attack is directed to. The ntp installations itself are not target of
the attack, but they are part of the DDoS network which the attacker is
driving (CVE-2013-5211).

** IMPORTANT **

Note: the workaround for this issue is not a change in the software, but
instead is a change in the default configuration.  In most cases, the
configuration change will need to be made manually by administrators in the
/etc/ntp.conf file, as the package will only install the updated configuration
as /etc/ntp.conf.rpmnew.  The following lines should be added to the end of
/etc/ntp.conf:

# Permit time synchronization with our time source, but do not
# permit the source to query or modify the service on this system.
restrict default nomodify notrap nopeer noquery

References:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-5211
http://www.kb.cert.org/vuls/id/348126
http://support.ntp.org/bin/view/Main/SecurityNotice#DRDoS_Amplification_Attack_using
http://lists.opensuse.org/opensuse-security-announce/2014-01/msg00005.html
========================

Updated packages in core/updates_testing:
========================
ntp-4.2.6p5-12.1.mga3
ntp-client-4.2.6p5-12.1.mga3
ntp-doc-4.2.6p5-12.1.mga3

Version: Cauldron => 3
Blocks: 11726 => (none)
Assignee: bugsquad => qa-bugs
Whiteboard: MGA3TOO => (none)

Testing complete on Mageia 3 i586 and x86_64.

Someone from the sysadmin team please push 12326.adv to updates.

Keywords: (none) => validated_update
Whiteboard: (none) => advisory MGA3-64-OK MGA3-32-OK
CC: (none) => davidwhodgins, sysadmin-bugs

Update pushed:
http://advisories.mageia.org/MGASA-2014-0032.html

Status: NEW => RESOLVED
CC: (none) => tmb
Resolution: (none) => FIXED