{"id":"CVE-2015-8138","aliases":["DEBIAN-CVE-2015-8138","DLA-559-1","DSA-3629-1","EUVD-2015-8028","GHSA-5mf2-6mvq-v64v","MGASA-2016-0039","RHSA-2016:0063","SUSE-SU-2016:1175-1","SUSE-SU-2016:1177-1","SUSE-SU-2016:1247-1","SUSE-SU-2016:1311-1","UBUNTU-CVE-2015-8138","USN-3096-1","openSUSE-SU-2024:10181-1"],"status":"published","title":"NTP before 4.2.8p6 and 4.3.x before 4.3.90 allows remote attackers to bypass the origin timestamp...","description":"NTP before 4.2.8p6 and 4.3.x before 4.3.90 allows remote attackers to bypass the origin timestamp validation via a packet with an origin timestamp set to zero.","severity":{"version":"3.0","score":5.3,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-07","score":0.06255,"percentile":0.93605,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-20"],"published":"2015-12-31T00:00:00Z","modified":"2026-08-27T23:02:17Z","fixes":[{"ecosystem":"Debian:11","package":"ntp","fixed_in":["1:4.2.8p7+dfsg-1"],"sources":["osv"]},{"ecosystem":"Red Hat:enterprise_linux:6::client","package":"ntp","fixed_in":["0:4.2.6p5-5.el6_7.4"],"sources":["osv"]},{"ecosystem":"Red Hat:enterprise_linux:6::client","package":"ntp-debuginfo","fixed_in":["0:4.2.6p5-5.el6_7.4"],"sources":["osv"]},{"ecosystem":"Red Hat:enterprise_linux:6::client","package":"ntpdate","fixed_in":["0:4.2.6p5-5.el6_7.4"],"sources":["osv"]},{"ecosystem":"Red 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:["advisory"]},{"url":"https://bugzilla.suse.com/937837","tags":["report"]},{"url":"https://www.suse.com/support/update/announcement/2016/suse-su-20161247-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/905885","tags":["report"]},{"url":"https://bugzilla.suse.com/910063","tags":["report"]},{"url":"https://bugzilla.suse.com/920238","tags":["report"]},{"url":"https://bugzilla.suse.com/926510","tags":["report"]},{"url":"https://bugzilla.suse.com/936327","tags":["report"]},{"url":"https://bugzilla.suse.com/942587","tags":["report"]},{"url":"https://bugzilla.suse.com/944300","tags":["report"]},{"url":"https://bugzilla.suse.com/946386","tags":["report"]},{"url":"https://bugzilla.suse.com/951608","tags":["report"]},{"url":"https://bugzilla.suse.com/954982","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7691","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7692","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7701","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7702","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7703","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7704","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7705","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7848","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7849","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7850","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7851","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7852","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7853","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7854","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7855","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7871","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2016/suse-su-20161311-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/920183","tags":["report"]},{"url":"https://bugzilla.suse.com/942441","tags":["report"]},{"url":"https://bugzilla.suse.com/943216","tags":["report"]},{"url":"https://bugzilla.suse.com/943218","tags":["report"]},{"url":"https://bugzilla.suse.com/951351","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2015-5194","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-5219","tags":["web"]},{"url":"https://ubuntu.com/security/CVE-2015-8138","tags":["report"]},{"url":"http://lists.ntp.org/pipermail/hackers/2016-January/007406.html","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-3096-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2015-7973","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2015-7974","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2015-7975","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2015-7976","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2015-7977","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2015-7978","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2015-7979","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2015-8158","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2016-0727","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2016-1547","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2016-1548","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2016-1550","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2016-2516","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2016-2518","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2016-4954","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2016-4955","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2016-4956","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2009-0159","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2009-1252","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2013-5211","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2014-9293","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2014-9294","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2014-9295","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2014-9296","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2014-9297","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2014-9298","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-1798","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-1799","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-1547","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-1548","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-1549","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-1550","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-1551","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-2516","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-2517","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-2518","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-2519","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-4953","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-4954","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-4955","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-4956","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-4957","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-7426","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-7427","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-7428","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-7429","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-7431","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-7433","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-7434","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-9310","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-9311","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2015-8138","description":"NTP before 4.2.8p6 and 4.3.x before 4.3.90 allows remote attackers to bypass the origin timestamp validation via a packet with an origin timestamp set to zero.","status":"published","published":"2017-01-30T21:00:00Z","modified":"2024-08-06T08:13:31.677Z","updated_at":"2026-11-02T14:35:40.900357Z"}],"euvd":[{"id":"EUVD-2015-8028","description":"NTP before 4.2.8p6 and 4.3.x before 4.3.90 allows remote attackers to bypass the origin timestamp validation via a packet with an origin timestamp set to zero.","status":"published","published":"2017-01-30T21:00:00Z","modified":"2024-08-06T08:13:31Z","updated_at":"2026-11-03T01:57:28.296316Z"}],"ghsa":[{"id":"GHSA-5mf2-6mvq-v64v","title":"NTP before 4.2.8p6 and 4.3.x before 4.3.90 allows remote attackers to bypass the origin timestamp...","description":"NTP before 4.2.8p6 and 4.3.x before 4.3.90 allows remote attackers to bypass the origin timestamp validation via a packet with an origin timestamp set to zero.","status":"published","published":"2022-05-13T01:05:09Z","modified":"2025-04-20T03:33:08Z","cvss":[{"version":"3.0","score":5.3,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T15:01:40.176288Z"}],"nvd":[{"id":"CVE-2015-8138","description":"NTP before 4.2.8p6 and 4.3.x before 4.3.90 allows remote attackers to bypass the origin timestamp validation via a packet with an origin timestamp set to zero.","status":"published","published":"2017-01-30T21:59:00.723Z","modified":"2026-06-17T00:34:05.03Z","cvss":[{"version":"3.0","score":5.3,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:03:16.97467Z"}],"osv":[{"id":"CVE-2015-8138","description":"NTP before 4.2.8p6 and 4.3.x before 4.3.90 allows remote attackers to bypass the origin timestamp validation via a packet with an origin timestamp set to zero.","status":"published","published":"2017-01-30T21:59:00Z","modified":"2026-04-16T06:16:51.344579867Z","cvss":[{"version":"3.0","score":5.3,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:01.068991Z"},{"id":"DEBIAN-CVE-2015-8138","description":"NTP before 4.2.8p6 and 4.3.x before 4.3.90 allows remote attackers to bypass the origin timestamp validation via a packet with an origin timestamp set to zero.","status":"published","published":"2017-01-30T21:59:00.723Z","modified":"2026-08-27T23:02:17.421187291Z","cvss":[{"version":"3.0","score":5.3,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:27.04239Z"},{"id":"UBUNTU-CVE-2015-8138","description":"NTP before 4.2.8p6 and 4.3.x before 4.3.90 allows remote attackers to bypass the origin timestamp validation via a packet with an origin timestamp set to zero.","status":"published","published":"2015-12-31T00:00:00Z","modified":"2026-02-04T03:43:30.115297Z","cvss":[{"version":"3.0","score":5.3,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:54:10.737723Z"},{"id":"DLA-559-1","title":"ntp - security update","status":"published","published":"2016-07-25T00:00:00Z","modified":"2026-03-09T02:09:08.117497Z","updated_at":"2026-11-02T15:46:13.207219Z"},{"id":"DSA-3629-1","title":"ntp - security update","status":"published","published":"2016-07-25T00:00:00Z","modified":"2026-03-09T01:22:51.220481Z","updated_at":"2026-11-02T15:46:16.199525Z"},{"id":"MGASA-2016-0039","title":"Updated ntp packages fix security vulnerability","description":"In ntpd before 4.2.8p6, when used with symmetric key encryption, the\nclient would accept packets encrypted with keys for any configured server,\nallowing a server to impersonate other servers to clients, thus performing\na man-in-the-middle attack. A server can be attacked by a client in a\nsimilar manner (CVE-2015-7974).\n\nA NULL pointer dereference flaw was found in the way ntpd processed 'ntpdc\nreslist' commands that queried restriction lists with a large amount of\nentries. A remote attacker could use this flaw to crash the ntpd process\n(CVE-2015-7977).\n\nA stack-based buffer overflow was found in the way ntpd processed 'ntpdc\nreslist' commands that queried restriction lists with a large amount of\nentries. A remote attacker could use this flaw to crash the ntpd process\n(CVE-2015-7978).\n\nIt was found that when NTP is configured in broadcast mode, an off-path\nattacker could broadcast packets with bad authentication (wrong key,\nmismatched key, incorrect MAC, etc) to all clients. The clients, upon\nreceiving the malformed packets, would break the association with the\nbroadcast server. This could cause the time on affected clients to become\nout of sync over a longer period of time (CVE-2015-7979).\n\nA faulty protection against spoofing and replay attacks allows an attacker\nto disrupt synchronization with kiss-of-death packets, take full control\nof the clock, or cause ntpd to crash (CVE-2015-8138).\n\nA flaw was found in the way the ntpq client certain processed incoming\npackets in a loop in the getresponse() function. A remote attacker could\npotentially use this flaw to crash an ntpq client instance\n(CVE-2015-8158).\n\nThe ntp package has been patched to fix these issues and a few other bugs.\n\nNote that there are still some unfixed issues.  Two of those issues,\nCVE-2015-8139 and CVE-2015-8140, are vulnerabilities to spoofing and\nreplay attacks that can be mitigated by either adding the noquery option\nto all restrict entries in ntp.conf, configuring ntpd to get time from\nmultiple sources, or using a restriction list to limit who is allowed to\nissue ntpq and ntpdc queries.\n\nAdditionally, the other unfixed issues can also be mitigated.\nCVE-2015-7973, a replay attack issue, can be mitigated by not using\nbroadcast mode, and CVE-2015-7976, a bug that can cause globbing issues\non the server, can be mitigated by restricting use of the \"saveconfig\"\ncommand with the \"restrict nomodify\" directive.\n","status":"published","published":"2016-01-29T11:02:50Z","modified":"2026-04-16T06:25:15.993589168Z","updated_at":"2026-11-02T15:49:39.792687Z"},{"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":"RHSA-2016:0063","title":"Red Hat Security Advisory: ntp security update","status":"published","published":"2024-09-15T23:09:52Z","modified":"2026-06-26T12:21:50.718488869Z","updated_at":"2026-11-02T15:53:03.182161Z"},{"id":"SUSE-SU-2016:1175-1","title":"Security update for ntp","description":"ntp was updated to version 4.2.8p6 to fix 12 security issues.\n\nThese security issues were fixed:\n- CVE-2015-8158: Fixed potential infinite loop in ntpq (bsc#962966).\n- CVE-2015-8138: Zero Origin Timestamp Bypass (bsc#963002).\n- CVE-2015-7979: Off-path Denial of Service (DoS) attack on authenticated broadcast mode (bsc#962784).\n- CVE-2015-7978: Stack exhaustion in recursive traversal of restriction list (bsc#963000).\n- CVE-2015-7977: reslist NULL pointer dereference (bsc#962970).\n- CVE-2015-7976: ntpq saveconfig command allows dangerous characters in filenames (bsc#962802).\n- CVE-2015-7975: nextvar() missing length check (bsc#962988).\n- CVE-2015-7974: Skeleton Key: Missing key check allows impersonation between authenticated peers (bsc#962960).\n- CVE-2015-7973: Replay attack on authenticated broadcast mode (bsc#962995).\n- CVE-2015-8140: ntpq vulnerable to replay attacks (bsc#962994).\n- CVE-2015-8139: Origin Leak: ntpq and ntpdc, disclose origin (bsc#962997).\n- CVE-2015-5300: MITM attacker could have forced ntpd to make a step larger than the panic threshold (bsc#951629).\n\nThese non-security issues were fixed:\n- fate#320758 bsc#975981: Enable compile-time support for MS-SNTP\n  (--enable-ntp-signd).  This replaces the w32 patches in 4.2.4 that added\n  the authreg directive.\n- bsc#962318: Call /usr/sbin/sntp with full path to synchronize in start-ntpd.\n  When run as cron job, /usr/sbin/ is not in the path, which caused\n  the synchronization to fail.\n- bsc#782060: Speedup ntpq.\n- bsc#916617: Add /var/db/ntp-kod.\n- bsc#956773: Add ntp-ENOBUFS.patch to limit a warning that might happen quite a lot on loaded systems.\n- bsc#951559,bsc#975496: Fix the TZ offset output of sntp during DST.\n- Add ntp-fork.patch and build with threads disabled to allow name resolution even when running chrooted.\n- bsc#784760: Remove local clock from default configuration\n","status":"published","published":"2016-04-28T13:46:02Z","modified":"2026-02-04T02:57:39.769134Z","updated_at":"2026-11-02T15:53:43.438985Z"},{"id":"SUSE-SU-2016:1177-1","title":"Security update for ntp","description":"ntp was updated to version 4.2.8p6 to fix 12 security issues.\n\nAlso yast2-ntp-client was updated to match some sntp syntax changes. (bsc#937837)\n\nThese security issues were fixed:\n- CVE-2015-8158: Fixed potential infinite loop in ntpq (bsc#962966).\n- CVE-2015-8138: Zero Origin Timestamp Bypass (bsc#963002).\n- CVE-2015-7979: Off-path Denial of Service (DoS) attack on authenticated broadcast mode (bsc#962784).\n- CVE-2015-7978: Stack exhaustion in recursive traversal of restriction list (bsc#963000).\n- CVE-2015-7977: reslist NULL pointer dereference (bsc#962970).\n- CVE-2015-7976: ntpq saveconfig command allows dangerous characters in filenames (bsc#962802).\n- CVE-2015-7975: nextvar() missing length check (bsc#962988).\n- CVE-2015-7974: Skeleton Key: Missing key check allows impersonation between authenticated peers (bsc#962960).\n- CVE-2015-7973: Replay attack on authenticated broadcast mode (bsc#962995).\n- CVE-2015-8140: ntpq vulnerable to replay attacks (bsc#962994).\n- CVE-2015-8139: Origin Leak: ntpq and ntpdc, disclose origin (bsc#962997).\n- CVE-2015-5300: MITM attacker could have forced ntpd to make a step larger than the panic threshold (bsc#951629).\n\nThese non-security issues were fixed:\n- fate#320758 bsc#975981: Enable compile-time support for MS-SNTP\n  (--enable-ntp-signd).  This replaces the w32 patches in 4.2.4 that added\n  the authreg directive.\n- bsc#962318: Call /usr/sbin/sntp with full path to synchronize in start-ntpd.\n  When run as cron job, /usr/sbin/ is not in the path, which caused\n  the synchronization to fail.\n- bsc#782060: Speedup ntpq.\n- bsc#916617: Add /var/db/ntp-kod.\n- bsc#956773: Add ntp-ENOBUFS.patch to limit a warning that might happen quite a lot on loaded systems.\n- bsc#951559,bsc#975496: Fix the TZ offset output of sntp during DST.\n- Add ntp-fork.patch and build with threads disabled to allow name resolution even when running chrooted.\n","status":"published","published":"2016-04-28T13:45:26Z","modified":"2026-02-04T04:14:10.491241Z","updated_at":"2026-11-02T15:53:43.438985Z"},{"id":"SUSE-SU-2016:1247-1","title":"Security update for ntp","description":"ntp was updated to version 4.2.8p6 to fix 28 security issues.\n\nMajor functional changes:\n- The 'sntp' commandline tool changed its option handling in a major way,\n  some options have been renamed or dropped.\n- 'controlkey 1' is added during update to ntp.conf to allow sntp to work.\n- The local clock is being disabled during update.\n- ntpd is no longer running chrooted.\n\nOther functional changes:\n- ntp-signd is installed.\n- 'enable mode7' can be added to the configuration to allow ntdpc to work as compatibility mode option.\n- 'kod' was removed from the default restrictions.\n- SHA1 keys are used by default instead of MD5 keys.\n\nAlso yast2-ntp-client was updated to match some sntp syntax changes. (bsc#937837)\n\nThese security issues were fixed:\n- CVE-2015-8158: Fixed potential infinite loop in ntpq (bsc#962966).\n- CVE-2015-8138: Zero Origin Timestamp Bypass (bsc#963002).\n- CVE-2015-7979: Off-path Denial of Service (DoS) attack on authenticated broadcast mode (bsc#962784).\n- CVE-2015-7978: Stack exhaustion in recursive traversal of restriction list (bsc#963000).\n- CVE-2015-7977: reslist NULL pointer dereference (bsc#962970).\n- CVE-2015-7976: ntpq saveconfig command allows dangerous characters in filenames (bsc#962802).\n- CVE-2015-7975: nextvar() missing length check (bsc#962988).\n- CVE-2015-7974: Skeleton Key: Missing key check allows impersonation between authenticated peers (bsc#962960).\n- CVE-2015-7973: Replay attack on authenticated broadcast mode (bsc#962995).\n- CVE-2015-8140: ntpq vulnerable to replay attacks (bsc#962994).\n- CVE-2015-8139: Origin Leak: ntpq and ntpdc, disclose origin (bsc#962997).\n- CVE-2015-5300: MITM attacker could have forced ntpd to make a step larger than the panic threshold (bsc#951629).\n- CVE-2015-7871: NAK to the Future: Symmetric association authentication bypass via crypto-NAK (bsc#951608).\n- CVE-2015-7855: decodenetnum() will ASSERT botch instead of returning FAIL on some bogus values (bsc#951608).\n- CVE-2015-7854: Password Length Memory Corruption Vulnerability (bsc#951608).\n- CVE-2015-7853: Invalid length data provided by a custom refclock driver could cause a buffer overflow (bsc#951608).\n- CVE-2015-7852: ntpq atoascii() Memory Corruption Vulnerability (bsc#951608).\n- CVE-2015-7851: saveconfig Directory Traversal Vulnerability (bsc#951608).\n- CVE-2015-7850: remote config logfile-keyfile (bsc#951608).\n- CVE-2015-7849: trusted key use-after-free (bsc#951608).\n- CVE-2015-7848: mode 7 loop counter underrun (bsc#951608).\n- CVE-2015-7701: Slow memory leak in CRYPTO_ASSOC (bsc#951608).\n- CVE-2015-7703: configuration directives 'pidfile' and 'driftfile' should only be allowed locally (bsc#951608).\n- CVE-2015-7704, CVE-2015-7705: Clients that receive a KoD should validate the origin timestamp field (bsc#951608).\n- CVE-2015-7691, CVE-2015-7692, CVE-2015-7702: Incomplete autokey data packet length checks (bsc#951608).\n\nThese non-security issues were fixed:\n- fate#320758 bsc#975981: Enable compile-time support for MS-SNTP (--enable-ntp-signd).\n  This replaces the w32 patches in 4.2.4 that added the authreg\n  directive.\n- bsc#962318: Call /usr/sbin/sntp with full path to synchronize in start-ntpd.\n  When run as cron job, /usr/sbin/ is not in the path, which caused\n  the synchronization to fail.\n- bsc#782060: Speedup ntpq.\n- bsc#916617: Add /var/db/ntp-kod.\n- bsc#956773: Add ntp-ENOBUFS.patch to limit a warning that might happen quite a lot on loaded systems.\n- bsc#951559,bsc#975496: Fix the TZ offset output of sntp during DST.\n- Add ntp-fork.patch and build with threads disabled to allow name resolution even when running chrooted.\n- Add a controlkey line to /etc/ntp.conf if one does not already exist to allow runtime configuuration via ntpq.\n- bsc#946386: Temporarily disable memlock to avoid problems due to high memory usage during name resolution.\n- bsc#905885: Use SHA1 instead of MD5 for symmetric keys.\n- Improve runtime configuration:\n  * Read keytype from ntp.conf\n  * Don't write ntp keys to syslog.\n- Fix legacy action scripts to pass on command line arguments.\n- bsc#944300: Remove 'kod' from the restrict line in ntp.conf.\n- bsc#936327: Use ntpq instead of deprecated ntpdc in start-ntpd.\n- Add a controlkey to ntp.conf to make the above work.\n- Don't let 'keysdir' lines in ntp.conf trigger the 'keys' parser.\n- Disable mode 7 (ntpdc) again, now that we don't use it anymore.\n- Add 'addserver' as a new legacy action.\n- bsc#910063: Fix the comment regarding addserver in ntp.conf.\n- bsc#926510: Disable chroot by default.\n- bsc#920238: Enable ntpdc for backwards compatibility.\n","status":"published","published":"2016-05-06T07:50:51Z","modified":"2026-02-04T03:41:19.510535Z","updated_at":"2026-11-02T15:53:43.438985Z"},{"id":"SUSE-SU-2016:1311-1","title":"Security update for ntp","description":"\nThis network time protocol server ntp was updated to 4.2.8p6 to fix the following\nissues:\n\nAlso yast2-ntp-client was updated to match some sntp syntax changes. (bsc#937837)\n\nMajor functional changes:\n- The 'sntp' commandline tool changed its option handling in a major way.\n- 'controlkey 1' is added during update to ntp.conf to allow sntp to work.\n- The local clock is being disabled during update.\n- ntpd is no longer running chrooted.\n\n\nOther functional changes:\n- ntp-signd is installed.\n- 'enable mode7' can be added to the configuration to allow ntdpc to work as compatibility mode option.\n- 'kod' was removed from the default restrictions.\n- SHA1 keys are used by default instead of MD5 keys.\n\nThese security issues were fixed:\n- CVE-2015-5219: An endless loop due to incorrect precision to double conversion (bsc#943216).\n- CVE-2015-8158: Fixed potential infinite loop in ntpq (bsc#962966).\n- CVE-2015-8138: Zero Origin Timestamp Bypass (bsc#963002).\n- CVE-2015-7979: Off-path Denial of Service (DoS) attack on authenticated broadcast mode (bsc#962784).\n- CVE-2015-7978: Stack exhaustion in recursive traversal of restriction list (bsc#963000).\n- CVE-2015-7977: reslist NULL pointer dereference (bsc#962970).\n- CVE-2015-7976: ntpq saveconfig command allows dangerous characters in filenames (bsc#962802).\n- CVE-2015-7975: nextvar() missing length check (bsc#962988).\n- CVE-2015-7974: Skeleton Key: Missing key check allows impersonation between authenticated peers (bsc#962960).\n- CVE-2015-7973: Replay attack on authenticated broadcast mode (bsc#962995).\n- CVE-2015-8140: ntpq vulnerable to replay attacks (bsc#962994).\n- CVE-2015-8139: Origin Leak: ntpq and ntpdc, disclose origin (bsc#962997).\n- CVE-2015-5300: MITM attacker could have forced ntpd to make a step larger than the panic threshold (bsc#951629).\n- CVE-2015-7871: NAK to the Future: Symmetric association authentication bypass via crypto-NAK (bsc#951608).\n- CVE-2015-7855: decodenetnum() will ASSERT botch instead of returning FAIL on some bogus values (bsc#951608).\n- CVE-2015-7854: Password Length Memory Corruption Vulnerability (bsc#951608).\n- CVE-2015-7853: Invalid length data provided by a custom refclock driver could cause a buffer overflow (bsc#951608).\n- CVE-2015-7852: ntpq atoascii() Memory Corruption Vulnerability (bsc#951608).\n- CVE-2015-7851: saveconfig Directory Traversal Vulnerability (bsc#951608).\n- CVE-2015-7850: remote config logfile-keyfile (bsc#951608).\n- CVE-2015-7849: trusted key use-after-free (bsc#951608).\n- CVE-2015-7848: mode 7 loop counter underrun (bsc#951608).\n- CVE-2015-7701: Slow memory leak in CRYPTO_ASSOC (bsc#951608).\n- CVE-2015-7703: configuration directives 'pidfile' and 'driftfile' should only be allowed locally (bsc#951608).\n- CVE-2015-7704, CVE-2015-7705: Clients that receive a KoD should validate the origin timestamp field (bsc#951608).\n- CVE-2015-7691, CVE-2015-7692, CVE-2015-7702: Incomplete autokey data packet length checks (bsc#951608).\n\nThese non-security issues were fixed:\n- fate#320758 bsc#975981: Enable compile-time support for MS-SNTP (--enable-ntp-signd).\n  This replaces the w32 patches in 4.2.4 that added the authreg\n  directive.\n- bsc#962318: Call /usr/sbin/sntp with full path to synchronize in start-ntpd.\n  When run as cron job, /usr/sbin/ is not in the path, which caused\n  the synchronization to fail.\n- bsc#782060: Speedup ntpq.\n- bsc#916617: Add /var/db/ntp-kod.\n- bsc#956773: Add ntp-ENOBUFS.patch to limit a warning that might happen quite a lot on loaded systems.\n- bsc#951559,bsc#975496: Fix the TZ offset output of sntp during DST.\n- Add ntp-fork.patch and build with threads disabled to allow name resolution even when running chrooted.\n- Add a controlkey line to /etc/ntp.conf if one does not already exist to allow runtime configuuration via ntpq.\n- bsc#946386: Temporarily disable memlock to avoid problems due to high memory usage during name resolution.\n- bsc#905885: Use SHA1 instead of MD5 for symmetric keys.\n- Improve runtime configuration:\n  * Read keytype from ntp.conf\n  * Don't write ntp keys to syslog.\n- Fix legacy action scripts to pass on command line arguments.\n- bsc#944300: Remove 'kod' from the restrict line in ntp.conf.\n- bsc#936327: Use ntpq instead of deprecated ntpdc in start-ntpd.\n- Don't let 'keysdir' lines in ntp.conf trigger the 'keys' parser.\n- Disable mode 7 (ntpdc) again, now that we don't use it anymore.\n- Add 'addserver' as a new legacy action.\n- bsc#910063: Fix the comment regarding addserver in ntp.conf.\n- bsc#926510: Disable chroot by default.\n- bsc#920238: Enable ntpdc for backwards compatibility.\n- bsc#784760: Remove local clock from default configuration.\n- bsc#942441/fate#319496: Require perl-Socket6.\n- Improve runtime configuration:\n  * Read keytype from ntp.conf\n  * Don't write ntp keys to syslog.\n- bsc#920183: Allow -4 and -6 address qualifiers in 'server' directives.\n- Use upstream ntp-wait, because our version is incompatible with\n  the new ntpq command line syntax.\n","status":"published","published":"2016-05-17T09:29:35Z","modified":"2026-02-04T04:38:27.911087Z","updated_at":"2026-11-02T15:53:43.438985Z"},{"id":"USN-3096-1","title":"ntp vulnerabilities","description":"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","status":"published","published":"2016-10-05T18:01:12Z","modified":"2026-02-10T04:41:02Z","updated_at":"2026-11-02T16:58:10.303275Z"}]}}