{"id":"USN-3096-1","summary":"ntp vulnerabilities","details":"Aanchal Malhotra discovered that NTP incorrectly handled authenticated\nbroadcast mode. A remote attacker could use this issue to perform a replay\nattack. (CVE-2015-7973)\n\nMatt Street discovered that NTP incorrectly verified peer associations of\nsymmetric keys. A remote attacker could use this issue to perform an\nimpersonation attack. (CVE-2015-7974)\n\nJonathan Gardner discovered that the NTP ntpq utility incorrectly handled\nmemory. An attacker could possibly use this issue to cause ntpq to crash,\nresulting in a denial of service. This issue only affected Ubuntu 16.04\nLTS. (CVE-2015-7975)\n\nJonathan Gardner discovered that the NTP ntpq utility incorrectly handled\ndangerous characters in filenames. An attacker could possibly use this\nissue to overwrite arbitrary files. (CVE-2015-7976)\n\nStephen Gray discovered that NTP incorrectly handled large restrict lists.\nAn attacker could use this issue to cause NTP to crash, resulting in a\ndenial of service. (CVE-2015-7977, CVE-2015-7978)\n\nAanchal Malhotra discovered that NTP incorrectly handled authenticated\nbroadcast mode. A remote attacker could use this issue to cause NTP to\ncrash, resulting in a denial of service. (CVE-2015-7979)\n\nJonathan Gardner discovered that NTP incorrectly handled origin timestamp\nchecks. A remote attacker could use this issue to spoof peer servers.\n(CVE-2015-8138)\n\nJonathan Gardner discovered that the NTP ntpq utility did not properly\nhandle certain incorrect values. An attacker could possibly use this issue\nto cause ntpq to hang, resulting in a denial of service. (CVE-2015-8158)\n\nIt was discovered that the NTP cronjob incorrectly cleaned up the\nstatistics directory. A local attacker could possibly use this to escalate\nprivileges. (CVE-2016-0727)\n\nStephen Gray and Matthew Van Gundy discovered that NTP incorrectly\nvalidated crypto-NAKs. A remote attacker could possibly use this issue to\nprevent clients from synchronizing. (CVE-2016-1547)\n\nMiroslav Lichvar and Jonathan Gardner discovered that NTP incorrectly\nhandled switching to interleaved symmetric mode. A remote attacker could\npossibly use this issue to prevent clients from synchronizing.\n(CVE-2016-1548)\n\nMatthew Van Gundy, Stephen Gray and Loganaden Velvindron discovered that\nNTP incorrectly handled message authentication. A remote attacker could\npossibly use this issue to recover the message digest key. (CVE-2016-1550)\n\nYihan Lian discovered that NTP incorrectly handled duplicate IPs on\nunconfig directives. An authenticated remote attacker could possibly use\nthis issue to cause NTP to crash, resulting in a denial of service.\n(CVE-2016-2516)\n\nYihan Lian discovered that NTP incorrectly handled certail peer\nassociations. A remote attacker could possibly use this issue to cause NTP\nto crash, resulting in a denial of service. (CVE-2016-2518)\n\nJakub Prokes discovered that NTP incorrectly handled certain spoofed\npackets. A remote attacker could possibly use this issue to cause a denial\nof service. (CVE-2016-4954)\n\nMiroslav Lichvar discovered that NTP incorrectly handled certain packets\nwhen autokey is enabled. A remote attacker could possibly use this issue to\ncause a denial of service. (CVE-2016-4955)\n\nMiroslav Lichvar discovered that NTP incorrectly handled certain spoofed\nbroadcast packets. A remote attacker could possibly use this issue to\ncause a denial of service. (CVE-2016-4956)\n\nIn the default installation, attackers would be isolated by the NTP\nAppArmor profile.\n","modified":"2026-02-10T04:41:02Z","published":"2016-10-05T18:01:12Z","related":["UBUNTU-CVE-2015-7973","UBUNTU-CVE-2015-7974","UBUNTU-CVE-2015-7975","UBUNTU-CVE-2015-7976","UBUNTU-CVE-2015-7977","UBUNTU-CVE-2015-7978","UBUNTU-CVE-2015-7979","UBUNTU-CVE-2015-8138","UBUNTU-CVE-2015-8158","UBUNTU-CVE-2016-0727","UBUNTU-CVE-2016-1547","UBUNTU-CVE-2016-1548","UBUNTU-CVE-2016-1550","UBUNTU-CVE-2016-2516","UBUNTU-CVE-2016-2518","UBUNTU-CVE-2016-4954","UBUNTU-CVE-2016-4955","UBUNTU-CVE-2016-4956"],"upstream":["CVE-2015-7973","CVE-2015-7974","CVE-2015-7975","CVE-2015-7976","CVE-2015-7977","CVE-2015-7978","CVE-2015-7979","CVE-2015-8138","CVE-2015-8158","CVE-2016-0727","CVE-2016-1547","CVE-2016-1548","CVE-2016-1550","CVE-2016-2516","CVE-2016-2518","CVE-2016-4954","CVE-2016-4955","CVE-2016-4956","UBUNTU-CVE-2015-7973","UBUNTU-CVE-2015-7974","UBUNTU-CVE-2015-7975","UBUNTU-CVE-2015-7976","UBUNTU-CVE-2015-7977","UBUNTU-CVE-2015-7978","UBUNTU-CVE-2015-7979","UBUNTU-CVE-2015-8138","UBUNTU-CVE-2015-8158","UBUNTU-CVE-2016-0727","UBUNTU-CVE-2016-1547","UBUNTU-CVE-2016-1548","UBUNTU-CVE-2016-1550","UBUNTU-CVE-2016-2516","UBUNTU-CVE-2016-2518","UBUNTU-CVE-2016-4954","UBUNTU-CVE-2016-4955","UBUNTU-CVE-2016-4956"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-3096-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2015-7973"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2015-7974"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2015-7975"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2015-7976"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2015-7977"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2015-7978"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2015-7979"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2015-8138"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2015-8158"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2016-0727"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2016-1547"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2016-1548"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2016-1550"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2016-2516"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2016-2518"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2016-4954"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2016-4955"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2016-4956"}],"affected":[{"package":{"name":"ntp","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/ntp@1:4.2.6.p5+dfsg-3ubuntu2.14.04.10?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:4.2.6.p5+dfsg-3ubuntu2.14.04.10"}]}],"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"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"ntp","binary_version":"1:4.2.6.p5+dfsg-3ubuntu2.14.04.10"},{"binary_name":"ntpdate","binary_version":"1:4.2.6.p5+dfsg-3ubuntu2.14.04.10"}]},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2015-7973","severity":[{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H","type":"CVSS_V3"},{"score":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}]},{"id":"CVE-2015-7974","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N","type":"CVSS_V3"},{"score":"CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}]},{"id":"CVE-2015-7976","severity":[{"score":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}]},{"id":"CVE-2015-7977","severity":[{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2015-7978","severity":[{"score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2015-7979","severity":[{"score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}]},{"id":"CVE-2015-8138","severity":[{"score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2015-8158","severity":[{"score":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}]},{"id":"CVE-2016-0727","severity":[{"score":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}]},{"id":"CVE-2016-1547","severity":[{"score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2016-1548","severity":[{"score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2016-1550","severity":[{"score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2016-2516","severity":[{"score":"CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2016-2518","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","type":"CVSS_V3"},{"score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}]},{"id":"CVE-2016-4954","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:L","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}]},{"id":"CVE-2016-4955","severity":[{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:L","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}]},{"id":"CVE-2016-4956","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","type":"CVSS_V3"},{"score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:14.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-3096-1.json"}},{"package":{"name":"ntp","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/ntp@1:4.2.8p4+dfsg-3ubuntu5.3?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:4.2.8p4+dfsg-3ubuntu5.3"}]}],"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"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"ntp","binary_version":"1:4.2.8p4+dfsg-3ubuntu5.3"},{"binary_name":"ntpdate","binary_version":"1:4.2.8p4+dfsg-3ubuntu5.3"}]},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2015-7973","severity":[{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H","type":"CVSS_V3"},{"score":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}]},{"id":"CVE-2015-7974","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N","type":"CVSS_V3"},{"score":"CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}]},{"id":"CVE-2015-7975","severity":[{"score":"CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"negligible","type":"Ubuntu"}]},{"id":"CVE-2015-7976","severity":[{"score":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}]},{"id":"CVE-2015-7977","severity":[{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2015-7978","severity":[{"score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2015-7979","severity":[{"score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}]},{"id":"CVE-2015-8138","severity":[{"score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2015-8158","severity":[{"score":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}]},{"id":"CVE-2016-0727","severity":[{"score":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}]},{"id":"CVE-2016-1547","severity":[{"score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2016-1548","severity":[{"score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2016-1550","severity":[{"score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2016-2516","severity":[{"score":"CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2016-2518","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","type":"CVSS_V3"},{"score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}]},{"id":"CVE-2016-4954","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:L","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}]},{"id":"CVE-2016-4955","severity":[{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:L","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}]},{"id":"CVE-2016-4956","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","type":"CVSS_V3"},{"score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:16.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-3096-1.json"}}],"schema_version":"1.7.3"}