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malicious authenticated peer can create arbitrarily-many ephemeral associations in order to win the clock selection algorithm in ntpd in NTP 4.2.8p4 and earlier and NTPsec 3e160db8dc248a0bcb053b56a80167dc742d2b74 and a5fb34b9cc89b92a8fef2f459004865c93bb7f92 and modify a victim's clock.","status":"published","published":"2017-01-06T21:00:00Z","modified":"2024-08-05T23:02:12.001Z","updated_at":"2026-11-02T14:33:35.488991Z"}],"euvd":[{"id":"EUVD-2016-2644","description":"A malicious authenticated peer can create arbitrarily-many ephemeral associations in order to win the clock selection algorithm in ntpd in NTP 4.2.8p4 and earlier and NTPsec 3e160db8dc248a0bcb053b56a80167dc742d2b74 and a5fb34b9cc89b92a8fef2f459004865c93bb7f92 and modify a victim's clock.","status":"published","published":"2017-01-06T21:00:00Z","modified":"2024-08-05T23:02:12Z","updated_at":"2026-11-03T02:22:56.538135Z"}],"ghsa":[{"id":"GHSA-r89j-r995-h68w","title":"A malicious authenticated peer can create arbitrarily-many ephemeral associations in order to win...","description":"A malicious authenticated peer can create arbitrarily-many ephemeral associations in order to win the clock selection algorithm in ntpd in NTP 4.2.8p4 and earlier and NTPsec 3e160db8dc248a0bcb053b56a80167dc742d2b74 and a5fb34b9cc89b92a8fef2f459004865c93bb7f92 and modify a victim's clock.","status":"published","published":"2022-05-14T03:34:38Z","modified":"2025-04-20T03:31:52Z","cvss":[{"version":"3.0","score":6.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","level":"medium"}],"updated_at":"2026-11-02T15:01:38.976438Z"}],"nvd":[{"id":"CVE-2016-1549","description":"A malicious authenticated peer can create arbitrarily-many ephemeral associations in order to win the clock selection algorithm in ntpd in NTP 4.2.8p4 and earlier and NTPsec 3e160db8dc248a0bcb053b56a80167dc742d2b74 and a5fb34b9cc89b92a8fef2f459004865c93bb7f92 and modify a victim's clock.","status":"published","published":"2017-01-06T21:59:00.383Z","modified":"2026-06-17T00:42:08.92Z","cvss":[{"version":"3.0","score":6.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":4,"vector":"AV:N/AC:L/Au:S/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-19"],"updated_at":"2026-11-02T14:03:33.686843Z"}],"osv":[{"id":"CVE-2016-1549","description":"A malicious authenticated peer can create arbitrarily-many ephemeral associations in order to win the clock selection algorithm in ntpd in NTP 4.2.8p4 and earlier and NTPsec 3e160db8dc248a0bcb053b56a80167dc742d2b74 and a5fb34b9cc89b92a8fef2f459004865c93bb7f92 and modify a victim's clock.","status":"published","published":"2017-01-06T21:59:00.383Z","modified":"2026-04-16T06:16:08.42374232Z","cvss":[{"version":"3.0","score":6.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:02.114472Z"},{"id":"DEBIAN-CVE-2016-1549","description":"A malicious authenticated peer can create arbitrarily-many ephemeral associations in order to win the clock selection algorithm in ntpd in NTP 4.2.8p4 and earlier and NTPsec 3e160db8dc248a0bcb053b56a80167dc742d2b74 and a5fb34b9cc89b92a8fef2f459004865c93bb7f92 and modify a victim's clock.","status":"published","published":"2017-01-06T21:59:00.383Z","modified":"2026-08-04T06:04:05.352489606Z","cvss":[{"version":"3.0","score":6.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:27.323751Z"},{"id":"UBUNTU-CVE-2016-1549","description":"A malicious authenticated peer can create arbitrarily-many ephemeral associations in order to win the clock selection algorithm in ntpd in NTP 4.2.8p4 and earlier and NTPsec 3e160db8dc248a0bcb053b56a80167dc742d2b74 and a5fb34b9cc89b92a8fef2f459004865c93bb7f92 and modify a victim's clock.","status":"published","published":"2017-01-06T21:59:00Z","modified":"2025-10-24T04:45:35Z","cvss":[{"version":"3.0","score":6.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","level":"medium"}],"updated_at":"2026-11-02T15:54:11.492576Z"},{"id":"MGASA-2018-0195","title":"Updated ntp packages fix security vulnerabilities","description":"This release addresses five security issues in ntpd for Mageia 6:\n\nLOW/MEDIUM: Sec 3012 / CVE-2016-1549 / VU#961909: Sybil vulnerability:\nephemeral association attack While fixed in ntp-4.2.8p7, there are\nsignificant additional protections for this issue in 4.2.8p11.\nReported by Matt Van Gundy of Cisco.\n\nINFO/MEDIUM: Sec 3412 / CVE-2018-7182 / VU#961909: ctl_getitem(): buffer\nread overrun leads to undefined behavior and information leak\nReported by Yihan Lian of Qihoo 360.\n\nLOW: Sec 3415 / CVE-2018-7170 / VU#961909: Multiple authenticated\nephemeral associations. Reported on the questions@ list.\n\nLOW: Sec 3453 / CVE-2018-7184 / VU#961909: Interleaved symmetric mode\ncannot recover from bad state. Reported by Miroslav Lichvar of Red Hat.\n\nLOW/MEDIUM: Sec 3454 / CVE-2018-7185 / VU#961909: Unauthenticated packet\ncan reset authenticated interleaved association.\nReported by Miroslav Lichvar of Red Hat.\n\none security issue in ntpq:\nMEDIUM: Sec 3414 / CVE-2018-7183 / VU#961909: ntpq:decodearr() can write\nbeyond its buffer limit. Reported by Michael Macnair of Thales-esecurity.com.\n\nand provides over 33 bugfixes and 32 other improvements. ENotification\nof these issues were delivered to our Institutional members on a rolling\nbasis as they were reported and as progress was made.\n","status":"published","published":"2018-04-06T22:54:47Z","modified":"2026-04-16T06:26:02.29934231Z","updated_at":"2026-11-02T15:49:40.442238Z"},{"id":"openSUSE-SU-2024:10181-1","title":"ntp-4.2.8p9-1.1 on GA media","description":"These are all security issues fixed in the ntp-4.2.8p9-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2026-02-04T03:21:26.696395Z","updated_at":"2026-11-02T16:58:33.135986Z"},{"id":"SUSE-SU-2016:1278-1","title":"Security update for ntp","description":"\nThis update for ntp to 4.2.8p7 fixes the following issues:\n\n* CVE-2016-1547, bsc#977459:\n  Validate crypto-NAKs, AKA: CRYPTO-NAK DoS.\n* CVE-2016-1548, bsc#977461: Interleave-pivot\n* CVE-2016-1549, bsc#977451:\n  Sybil vulnerability: ephemeral association attack.\n* CVE-2016-1550, bsc#977464: Improve NTP security against buffer\n  comparison timing attacks.\n* CVE-2016-1551, bsc#977450:\n  Refclock impersonation vulnerability\n* CVE-2016-2516, bsc#977452: Duplicate IPs on unconfig\n  directives will cause an assertion botch in ntpd.\n* CVE-2016-2517, bsc#977455: remote configuration trustedkey/\n  requestkey/controlkey values are not properly validated.\n* CVE-2016-2518, bsc#977457: Crafted addpeer with hmode \u003e 7\n  causes array wraparound with MATCH_ASSOC.\n* CVE-2016-2519, bsc#977458: ctl_getitem() return value not\n  always checked.\n* This update also improves the fixes for:\n  CVE-2015-7704, CVE-2015-7705, CVE-2015-7974\n\nBugs fixed:\n- Restrict the parser in the startup script to the first\n  occurrance of 'keys' and 'controlkey' in ntp.conf (bsc#957226).\n","status":"published","published":"2016-05-11T12:37:44Z","modified":"2026-02-04T02:37:24.950334Z","updated_at":"2026-11-02T15:53:43.438985Z"},{"id":"SUSE-SU-2016:1291-1","title":"Security update for ntp","description":"\nThis update for ntp to 4.2.8p7 fixes the following issues:\n\n* CVE-2016-1547, bsc#977459:\n  Validate crypto-NAKs, AKA: CRYPTO-NAK DoS.\n* CVE-2016-1548, bsc#977461: Interleave-pivot\n* CVE-2016-1549, bsc#977451:\n  Sybil vulnerability: ephemeral association attack.\n* CVE-2016-1550, bsc#977464: Improve NTP security against buffer\n  comparison timing attacks.\n* CVE-2016-1551, bsc#977450:\n  Refclock impersonation vulnerability\n* CVE-2016-2516, bsc#977452: Duplicate IPs on unconfig\n  directives will cause an assertion botch in ntpd.\n* CVE-2016-2517, bsc#977455: remote configuration trustedkey/\n  requestkey/controlkey values are not properly validated.\n* CVE-2016-2518, bsc#977457: Crafted addpeer with hmode \u003e 7\n  causes array wraparound with MATCH_ASSOC.\n* CVE-2016-2519, bsc#977458: ctl_getitem() return value not\n  always checked.\n* This update also improves the fixes for:\n  CVE-2015-7704, CVE-2015-7705, CVE-2015-7974\n\nBugs fixed:\n- Restrict the parser in the startup script to the first\n  occurrance of 'keys' and 'controlkey' in ntp.conf (bsc#957226).\n","status":"published","published":"2016-05-12T14:58:24Z","modified":"2026-02-04T02:42:43.615706Z","updated_at":"2026-11-02T15:53:43.438985Z"},{"id":"SUSE-SU-2016:1471-1","title":"Security update for ntp","description":"\nThis update for ntp fixes the following issues: \n\n- Separate the creation of ntp.keys and key #1 in it to avoid\n  problems when upgrading installations that have the file, but\n  no key #1, which is needed e.g. by 'rcntp addserver'.\n\n- Update to 4.2.8p7 (bsc#977446):\n  * CVE-2016-1547, bsc#977459:\n    Validate crypto-NAKs, AKA: CRYPTO-NAK DoS.\n  * CVE-2016-1548, bsc#977461: Interleave-pivot\n  * CVE-2016-1549, bsc#977451:\n    Sybil vulnerability: ephemeral association attack.\n  * CVE-2016-1550, bsc#977464: Improve NTP security against buffer\n    comparison timing attacks.\n  * CVE-2016-1551, bsc#977450:\n    Refclock impersonation vulnerability\n  * CVE-2016-2516, bsc#977452: Duplicate IPs on unconfig\n    directives will cause an assertion botch in ntpd.\n  * CVE-2016-2517, bsc#977455: remote configuration trustedkey/\n    requestkey/controlkey values are not properly validated.\n  * CVE-2016-2518, bsc#977457: Crafted addpeer with hmode \u003e 7\n    causes array wraparound with MATCH_ASSOC.\n  * CVE-2016-2519, bsc#977458: ctl_getitem() return value not\n    always checked.\n  * integrate ntp-fork.patch\n  * Improve the fixes for:\n    CVE-2015-7704, CVE-2015-7705, CVE-2015-7974\n- Restrict the parser in the startup script to the first\n  occurrance of 'keys' and 'controlkey' in ntp.conf (bsc#957226).\n\n","status":"published","published":"2016-06-01T12:36:52Z","modified":"2026-02-04T03:05:59.062347Z","updated_at":"2026-11-02T15:53:43.438985Z"},{"id":"SUSE-SU-2016:1568-1","title":"Security update for ntp","description":"ntp was updated to version 4.2.8p8 to fix 17 security issues.\n\nThese security issues were fixed:\n- CVE-2016-4956: Broadcast interleave (bsc#982068).\n- CVE-2016-2518: Crafted addpeer with hmode \u003e 7 causes array wraparound with MATCH_ASSOC (bsc#977457).\n- CVE-2016-2519: ctl_getitem() return value not always checked (bsc#977458).\n- CVE-2016-4954: Processing spoofed server packets (bsc#982066).\n- CVE-2016-4955: Autokey association reset (bsc#982067).\n- CVE-2015-7974: NTP did not verify peer associations of symmetric keys when authenticating packets, which might allowed remote attackers to conduct impersonation attacks via an arbitrary trusted key, aka a 'skeleton key (bsc#962960).\n- CVE-2016-4957: CRYPTO_NAK crash (bsc#982064).\n- CVE-2016-2516: Duplicate IPs on unconfig directives will cause an assertion botch (bsc#977452).\n- CVE-2016-2517: Remote configuration trustedkey/requestkey values are not properly validated (bsc#977455).\n- CVE-2016-4953: Bad authentication demobilizes ephemeral associations (bsc#982065).\n- CVE-2016-1547: CRYPTO-NAK DoS (bsc#977459).\n- CVE-2016-1551: Refclock impersonation vulnerability, AKA: refclock-peering (bsc#977450).\n- CVE-2016-1550: Improve NTP security against buffer comparison timing attacks, authdecrypt-timing, AKA: authdecrypt-timing (bsc#977464).\n- CVE-2016-1548: Interleave-pivot - MITIGATION ONLY (bsc#977461).\n- CVE-2016-1549: Sybil vulnerability: ephemeral association attack, AKA: ntp-sybil - MITIGATION ONLY (bsc#977451).\n\nThis release also contained improved patches for CVE-2015-7704, CVE-2015-7705, CVE-2015-7974.\n\nThese non-security issues were fixed:\n- bsc#979302: Change the process name of the forking DNS worker process to avoid the impression that ntpd is started twice.\n- bsc#981422: Don't ignore SIGCHILD because it breaks wait().\n- bsc#979981: ntp-wait does not accept fractional seconds, so use 1 instead of 0.2 in ntp-wait.service.\n- Separate the creation of ntp.keys and key #1 in it to avoid problems when upgrading installations that have the file, but no key #1, which is needed e.g. by 'rcntp addserver'.\n- bsc#957226: Restrict the parser in the startup script to the first occurrance of 'keys' and 'controlkey' in ntp.conf.\n  ","status":"published","published":"2016-06-14T06:45:46Z","modified":"2026-02-04T02:54:59.789302Z","updated_at":"2026-11-02T15:53:43.438985Z"},{"id":"SUSE-SU-2018:0808-1","title":"Security update for ntp","description":"This update for ntp fixes the following issues:\n\nSecurity issues fixed:\n\n- CVE-2016-1549: Significant additional protections against CVE-2016-1549 that was fixed in ntp-4.2.8p7 (bsc#1082210).\n- CVE-2018-7170: Ephemeral association time spoofing additional protection (bsc#1083424).\n- CVE-2018-7182: Buffer read overrun leads information leak in ctl_getitem() (bsc#1083426).\n- CVE-2018-7183: decodearr() can write beyond its buffer limit (bsc#1083417).\n- CVE-2018-7184: Interleaved symmetric mode cannot recover from bad state (bsc#1083422).\n- CVE-2018-7185: Unauthenticated packet can reset authenticated interleaved association (bsc#1083420).\n\nBug fixes:\n\n- bsc#1077445: Don't use libevent's cached time stamps in sntp.\n- Disable CMAC in ntp when building against a version of OpenSSL that doesn't support it.\n","status":"published","published":"2018-03-26T09:50:07Z","modified":"2026-02-04T02:57:42.78561Z","updated_at":"2026-11-02T15:53:44.594517Z"},{"id":"SUSE-SU-2018:0956-1","title":"Security update for ntp","description":"This update for ntp fixes the following issues:\n\n- Update to 4.2.8p11 (bsc#1082210):\n  * CVE-2016-1549: Sybil vulnerability: ephemeral association\n    attack. While fixed in ntp-4.2.8p7, there are significant\n    additional protections for this issue in 4.2.8p11.\n  * CVE-2018-7182: ctl_getitem(): buffer read overrun\n    leads to undefined behavior and information leak. (bsc#1083426)\n  * CVE-2018-7170: Multiple authenticated ephemeral\n    associations. (bsc#1083424)\n  * CVE-2018-7184: Interleaved symmetric mode cannot\n    recover from bad state. (bsc#1083422)\n  * CVE-2018-7185: Unauthenticated packet can reset\n    authenticated interleaved association. (bsc#1083420)\n  * CVE-2018-7183: ntpq:decodearr() can write beyond its\n    buffer limit.(bsc#1083417)\n- Don't use libevent's cached time stamps in sntp. (bsc#1077445)\n\n","status":"published","published":"2018-04-16T15:31:58Z","modified":"2026-02-04T04:27:09.719502Z","updated_at":"2026-11-02T15:53:44.594517Z"},{"id":"SUSE-SU-2018:1464-1","title":"Security update for ntp","description":"This update for ntp fixes the following issues:\n\n- Update to 4.2.8p11 (bsc#1082210):\n  * CVE-2016-1549: Sybil vulnerability: ephemeral association\n    attack. While fixed in ntp-4.2.8p7, there are significant\n    additional protections for this issue in 4.2.8p11.\n  * CVE-2018-7182: ctl_getitem(): buffer read overrun\n    leads to undefined behavior and information leak. (bsc#1083426)\n  * CVE-2018-7170: Multiple authenticated ephemeral\n    associations. (bsc#1083424)\n  * CVE-2018-7184: Interleaved symmetric mode cannot\n    recover from bad state. (bsc#1083422)\n  * CVE-2018-7185: Unauthenticated packet can reset\n    authenticated interleaved association. (bsc#1083420)\n  * CVE-2018-7183: ntpq:decodearr() can write beyond its\n    buffer limit.(bsc#1083417)\n- Don't use libevent's cached time stamps in sntp. (bsc#1077445)\n- Fix systemd migration in %pre (bsc#1034892).\n\n","status":"published","published":"2018-05-29T14:44:40Z","modified":"2025-05-02T04:05:08.576194Z","updated_at":"2026-11-02T15:53:44.972817Z"},{"id":"SUSE-SU-2018:1765-1","title":"Security update for ntp","description":"This update for ntp fixes the following issues:\n\n- Update to 4.2.8p11 (bsc#1082210):\n  * CVE-2016-1549: Sybil vulnerability: ephemeral association\n    attack. While fixed in ntp-4.2.8p7, there are significant\n    additional protections for this issue in 4.2.8p11.\n  * CVE-2018-7182: ctl_getitem(): buffer read overrun\n    leads to undefined behavior and information leak. (bsc#1083426)\n  * CVE-2018-7170: Multiple authenticated ephemeral\n    associations. (bsc#1083424)\n  * CVE-2018-7184: Interleaved symmetric mode cannot\n    recover from bad state. (bsc#1083422)\n  * CVE-2018-7185: Unauthenticated packet can reset\n    authenticated interleaved association. (bsc#1083420)\n  * CVE-2018-7183: ntpq:decodearr() can write beyond its\n    buffer limit.(bsc#1083417)\n- Don't use libevent's cached time stamps in sntp. (bsc#1077445)\n\nThis update is a reissue of the previous update with LTSS channels included.\n","status":"published","published":"2018-06-20T13:46:39Z","modified":"2026-02-04T03:30:59.371908Z","updated_at":"2026-11-02T15:53:44.972817Z"},{"id":"SUSE-SU-2018:1765-2","title":"Security update for ntp","description":"This update for ntp fixes the following issues:\n\n- Update to 4.2.8p11 (bsc#1082210):\n  * CVE-2016-1549: Sybil vulnerability: ephemeral association\n    attack. While fixed in ntp-4.2.8p7, there are significant\n    additional protections for this issue in 4.2.8p11.\n  * CVE-2018-7182: ctl_getitem(): buffer read overrun\n    leads to undefined behavior and information leak. (bsc#1083426)\n  * CVE-2018-7170: Multiple authenticated ephemeral\n    associations. (bsc#1083424)\n  * CVE-2018-7184: Interleaved symmetric mode cannot\n    recover from bad state. (bsc#1083422)\n  * CVE-2018-7185: Unauthenticated packet can reset\n    authenticated interleaved association. (bsc#1083420)\n  * CVE-2018-7183: ntpq:decodearr() can write beyond its\n    buffer limit.(bsc#1083417)\n- Don't use libevent's cached time stamps in sntp. (bsc#1077445)\n\nThis update is a reissue of the previous update with LTSS channels included.\n","status":"published","published":"2018-10-18T12:46:59Z","modified":"2026-02-04T04:28:51.286742Z","updated_at":"2026-11-02T15:53:44.972817Z"}]}}