{"id":"UBUNTU-CVE-2018-7170","details":"ntpd in ntp 4.2.x before 4.2.8p7 and 4.3.x before 4.3.92 allows authenticated users that know the private symmetric key to create arbitrarily-many ephemeral associations in order to win the clock selection of ntpd and modify a victim's clock via a Sybil attack. This issue exists because of an incomplete fix for CVE-2016-1549.","modified":"2025-10-24T04:46:55Z","published":"2018-03-06T20:29:00Z","upstream":["CVE-2018-7170"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-7170"},{"type":"REPORT","url":"http://www.kb.cert.org/vuls/id/961909"},{"type":"REPORT","url":"http://support.ntp.org/bin/view/Main/SecurityNotice#February_2018_ntp_4_2_8p11_NTP_S"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2018-7170"}],"affected":[{"package":{"name":"ntp","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/ntp@1:4.2.6.p5+dfsg-3ubuntu2.14.04.13+esm1?arch=source&distro=esm-infra-legacy/trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:4.2.6.p5+dfsg-3ubuntu2","1:4.2.6.p5+dfsg-3ubuntu2.14.04.1","1:4.2.6.p5+dfsg-3ubuntu2.14.04.2","1:4.2.6.p5+dfsg-3ubuntu2.14.04.3","1:4.2.6.p5+dfsg-3ubuntu2.14.04.5","1:4.2.6.p5+dfsg-3ubuntu2.14.04.6","1:4.2.6.p5+dfsg-3ubuntu2.14.04.7","1:4.2.6.p5+dfsg-3ubuntu2.14.04.8","1:4.2.6.p5+dfsg-3ubuntu2.14.04.10","1:4.2.6.p5+dfsg-3ubuntu2.14.04.11","1:4.2.6.p5+dfsg-3ubuntu2.14.04.12","1:4.2.6.p5+dfsg-3ubuntu2.14.04.13","1:4.2.6.p5+dfsg-3ubuntu2.14.04.13+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"ntp","binary_version":"1:4.2.6.p5+dfsg-3ubuntu2.14.04.13+esm1"},{"binary_name":"ntpdate","binary_version":"1:4.2.6.p5+dfsg-3ubuntu2.14.04.13+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-7170.json"}},{"package":{"name":"ntp","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/ntp@1:4.2.8p4+dfsg-3ubuntu5.10?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:4.2.6.p5+dfsg-3ubuntu8","1:4.2.6.p5+dfsg-3ubuntu8.1","1:4.2.6.p5+dfsg-3ubuntu9","1:4.2.8p4+dfsg-3ubuntu1","1:4.2.8p4+dfsg-3ubuntu2","1:4.2.8p4+dfsg-3ubuntu3","1:4.2.8p4+dfsg-3ubuntu4","1:4.2.8p4+dfsg-3ubuntu5","1:4.2.8p4+dfsg-3ubuntu5.1","1:4.2.8p4+dfsg-3ubuntu5.2","1:4.2.8p4+dfsg-3ubuntu5.3","1:4.2.8p4+dfsg-3ubuntu5.4","1:4.2.8p4+dfsg-3ubuntu5.5","1:4.2.8p4+dfsg-3ubuntu5.6","1:4.2.8p4+dfsg-3ubuntu5.7","1:4.2.8p4+dfsg-3ubuntu5.8","1:4.2.8p4+dfsg-3ubuntu5.9","1:4.2.8p4+dfsg-3ubuntu5.10"],"ecosystem_specific":{"binaries":[{"binary_name":"ntp","binary_version":"1:4.2.8p4+dfsg-3ubuntu5.10"},{"binary_name":"ntpdate","binary_version":"1:4.2.8p4+dfsg-3ubuntu5.10"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-7170.json"}},{"package":{"name":"ntp","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/ntp@1:4.2.8p10+dfsg-5ubuntu7.3+esm1?arch=source&distro=esm-apps/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:4.2.8p10+dfsg-5ubuntu3","1:4.2.8p10+dfsg-5ubuntu4","1:4.2.8p10+dfsg-5ubuntu5","1:4.2.8p10+dfsg-5ubuntu6","1:4.2.8p10+dfsg-5ubuntu7","1:4.2.8p10+dfsg-5ubuntu7.1","1:4.2.8p10+dfsg-5ubuntu7.1+esm1","1:4.2.8p10+dfsg-5ubuntu7.1+esm2","1:4.2.8p10+dfsg-5ubuntu7.2","1:4.2.8p10+dfsg-5ubuntu7.2+esm1","1:4.2.8p10+dfsg-5ubuntu7.3","1:4.2.8p10+dfsg-5ubuntu7.3+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"ntp","binary_version":"1:4.2.8p10+dfsg-5ubuntu7.3+esm1"},{"binary_name":"ntpdate","binary_version":"1:4.2.8p10+dfsg-5ubuntu7.3+esm1"},{"binary_name":"sntp","binary_version":"1:4.2.8p10+dfsg-5ubuntu7.3+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-7170.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N"},{"type":"Ubuntu","score":"low"}]}