The panic_gate check in NTP before 4.2.8p5 is only re-enabled after the first change to the system clock that was greater than 128 milliseconds by default, which allows remote attackers to set NTP to an arbitrary time when started with the -g option, or to alter the time by up to 900 seconds otherwise by responding to an unspecified number of requests from trusted sources, and leveraging a resulting denial of service (abort and restart).
http://aix.software.ibm.com/aix/efixes/security/ntp_advisory5.asc
http://lists.fedoraproject.org/pipermail/package-announce/2015-November/170684.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-November/170926.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-February/177507.html
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00059.html
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00060.html
http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00020.html
http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00038.html
http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00048.html
http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00026.html
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00042.html
http://lists.opensuse.org/opensuse-updates/2016-05/msg00114.html
http://rhn.redhat.com/errata/RHSA-2015-1930.html
http://seclists.org/bugtraq/2016/Feb/164
http://support.ntp.org/bin/view/Main/NtpBug2956
http://support.ntp.org/bin/view/Main/SecurityNotice#January_2016_NTP_4_2_8p5_Securit
http://www.debian.org/security/2015/dsa-3388
http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
http://www.securityfocus.com/bid/77312
http://www.securitytracker.com/id/1034670
http://www.ubuntu.com/usn/USN-2783-1
https://bto.bluecoat.com/security-advisory/sa113
https://bugzilla.redhat.com/show_bug.cgi?id=1271076
https://ics-cert.us-cert.gov/advisories/ICSA-15-356-01
https://security.netapp.com/advisory/ntap-20171004-0001/
https://support.citrix.com/article/CTX220112
https://www.cs.bu.edu/~goldbe/NTPattack.html
https://www.freebsd.org/security/advisories/FreeBSD-SA-16:02.ntp.asc
https://www.ibm.com/support/home/docdisplay?lndocid=migr-5099428
https://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html
https://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
https://www-01.ibm.com/support/docview.wss?uid=isg3T1023885
https://www-01.ibm.com/support/docview.wss?uid=isg3T1024073
https://www-01.ibm.com/support/docview.wss?uid=nas8N1021264
https://www-01.ibm.com/support/docview.wss?uid=ssg1S1005821
https://www-01.ibm.com/support/docview.wss?uid=swg21979393
https://www-01.ibm.com/support/docview.wss?uid=swg21980676
Source: MITRE
Published: 2017-07-21
Updated: 2018-10-30
Type: CWE-361
Base Score: 5
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P
Impact Score: 2.9
Exploitability Score: 10
Severity: MEDIUM
Base Score: 7.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Impact Score: 3.6
Exploitability Score: 3.9
Severity: HIGH