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pointing the key file at the log file.","status":"published","published":"2022-05-13T01:25:44Z","modified":"2025-04-20T03:43:23Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-835"],"updated_at":"2026-11-02T15:01:50.574323Z"}],"nvd":[{"id":"CVE-2015-7850","description":"ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote authenticated users to cause a denial of service (infinite loop or crash) by pointing the key file at the log file.","status":"published","published":"2017-08-07T20:29:00.823Z","modified":"2026-06-17T00:33:15.517Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"},{"version":"2.0","score":4,"vector":"AV:N/AC:L/Au:S/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-835"],"updated_at":"2026-11-02T14:03:17.730372Z"}],"osv":[{"id":"CVE-2015-7850","description":"ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote authenticated users to cause a denial of service (infinite loop or crash) by pointing the key file at the log file.","status":"published","published":"2017-08-07T20:29:00Z","modified":"2026-04-16T06:21:51.774224854Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:44:01.068991Z"},{"id":"DEBIAN-CVE-2015-7850","description":"ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote authenticated users to cause a denial of service (infinite loop or crash) by pointing the key file at the log file.","status":"published","published":"2017-08-07T20:29:00.823Z","modified":"2026-08-27T23:02:14.324102822Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:45:27.04239Z"},{"id":"UBUNTU-CVE-2015-7850","description":"ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote authenticated users to cause a denial of service (infinite loop or crash) by pointing the key file at the log file.","status":"published","published":"2015-10-22T00:00:00Z","modified":"2026-02-04T04:25:20.646678Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"},{"version":"3.0","score":6.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:54:10.737723Z"},{"id":"DLA-335-1","title":"ntp - security update","status":"published","published":"2015-10-28T00:00:00Z","modified":"2026-03-09T01:23:37.230378Z","updated_at":"2026-11-02T15:46:11.734021Z"},{"id":"DSA-3388-1","title":"ntp - security update","status":"published","published":"2015-11-01T00:00:00Z","modified":"2026-03-09T01:20:49.800811Z","updated_at":"2026-11-02T15:46:16.199525Z"},{"id":"MGASA-2015-0418","title":"Updated ntp package fixes security vulnerabilities","description":"Yves Younan discovered that NTP incorrectly handled logfile and\nkeyfile directives. In a non-default configuration, a remote\nauthenticated attacker could possibly use this issue to cause NTP to\nenter a loop, resulting in a denial of service (CVE-2015-7850).\n\nYves Younan discovered that NTP incorrectly handled reference clock\nmemory. A malicious refclock could possibly use this issue to cause NTP\nto crash, resulting in a denial of service, or possibly execute\narbitrary code (CVE-2015-7853).\n\nJohn D \"Doug\" Birdwell discovered that NTP incorrectly handled decoding\ncertain bogus values. An attacker could possibly use this issue to\ncause NTP to crash, resulting in a denial of service (CVE-2015-7855).\n","status":"published","published":"2015-10-30T20:11:10Z","modified":"2026-04-16T06:23:25.239596947Z","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":"SUSE-SU-2015:2058-1","title":"Security update for ntp","description":"This ntp update provides the following security and non security fixes:\n\n- Update to 4.2.8p4 to fix several security issues (bsc#951608):\n  * CVE-2015-7871: NAK to the Future: Symmetric association\n    authentication bypass via crypto-NAK\n  * CVE-2015-7855: decodenetnum() will ASSERT botch instead of\n    returning FAIL on some bogus values\n  * CVE-2015-7854: Password Length Memory Corruption Vulnerability\n  * CVE-2015-7853: Invalid length data provided by a custom\n    refclock driver could cause a buffer overflow\n  * CVE-2015-7852 ntpq atoascii() Memory Corruption Vulnerability\n  * CVE-2015-7851 saveconfig Directory Traversal Vulnerability\n  * CVE-2015-7850 remote config logfile-keyfile\n  * CVE-2015-7849 trusted key use-after-free\n  * CVE-2015-7848 mode 7 loop counter underrun\n  * CVE-2015-7701 Slow memory leak in CRYPTO_ASSOC\n  * CVE-2015-7703 configuration directives 'pidfile' and\n    'driftfile' should only be allowed locally\n  * CVE-2015-7704, CVE-2015-7705 Clients that receive a KoD should\n    validate the origin timestamp field\n  * CVE-2015-7691, CVE-2015-7692, CVE-2015-7702 Incomplete autokey\n    data packet length checks\n- Use ntpq instead of deprecated ntpdc in start-ntpd (bnc#936327).\n- Add a controlkey to ntp.conf to make the above work.\n- Improve runtime configuration:\n  * Read keytype from ntp.conf\n  * Don't write ntp keys to syslog.\n- Don't let 'keysdir' lines in ntp.conf trigger the 'keys' parser.\n- Fix the comment regarding addserver in ntp.conf (bnc#910063).\n- Remove ntp.1.gz, it wasn't installed anymore.\n- Remove ntp-4.2.7-rh-manpages.tar.gz and only keep ntptime.8.gz.\n  The rest is partially irrelevant, partially redundant and\n  potentially outdated (bsc#942587).\n- Remove 'kod' from the restrict line in ntp.conf (bsc#944300).\n- Use SHA1 instead of MD5 for symmetric keys (bsc#905885).\n- Require perl-Socket6 (bsc#942441).\n- Fix incomplete backporting of 'rcntp ntptimemset'.\n","status":"published","published":"2015-11-20T09:21:30Z","modified":"2026-02-04T03:52:51.902373Z","updated_at":"2026-11-02T15:53:43.030986Z"},{"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-2783-1","title":"ntp vulnerabilities","description":"Aleksis Kauppinen discovered that NTP incorrectly handled certain remote\nconfig packets. In a non-default configuration, a remote authenticated\nattacker could possibly use this issue to cause NTP to crash, resulting in\na denial of service. (CVE-2015-5146)\n\nMiroslav Lichvar discovered that NTP incorrectly handled logconfig\ndirectives. In a non-default configuration, a remote authenticated attacker\ncould possibly use this issue to cause NTP to crash, resulting in a denial\nof service. (CVE-2015-5194)\n\nMiroslav Lichvar discovered that NTP incorrectly handled certain statistics\ntypes. In a non-default configuration, a remote authenticated attacker\ncould possibly use this issue to cause NTP to crash, resulting in a denial\nof service. (CVE-2015-5195)\n\nMiroslav Lichvar discovered that NTP incorrectly handled certain file\npaths. In a non-default configuration, a remote authenticated attacker\ncould possibly use this issue to cause NTP to crash, resulting in a denial\nof service, or overwrite certain files. (CVE-2015-5196, CVE-2015-7703)\n\nMiroslav Lichvar discovered that NTP incorrectly handled certain packets.\nA remote attacker could possibly use this issue to cause NTP to hang,\nresulting in a denial of service. (CVE-2015-5219)\n\nAanchal Malhotra, Isaac E. Cohen, and Sharon Goldberg discovered that NTP\nincorrectly handled restarting after hitting a panic threshold. A remote\nattacker could possibly use this issue to alter the system time on clients.\n(CVE-2015-5300)\n\nIt was discovered that NTP incorrectly handled autokey data packets. A\nremote attacker could possibly use this issue to cause NTP to crash,\nresulting in a denial of service, or possibly execute arbitrary code.\n(CVE-2015-7691, CVE-2015-7692, CVE-2015-7702)\n\nIt was discovered that NTP incorrectly handled memory when processing\ncertain autokey messages. A remote attacker could possibly use this issue\nto cause NTP to consume memory, resulting in a denial of service.\n(CVE-2015-7701)\n\nAanchal Malhotra, Isaac E. Cohen, and Sharon Goldberg discovered that NTP\nincorrectly handled rate limiting. A remote attacker could possibly use\nthis issue to cause clients to stop updating their clock. (CVE-2015-7704,\nCVE-2015-7705)\n\nYves Younan discovered that NTP incorrectly handled logfile and keyfile\ndirectives. In a non-default configuration, a remote authenticated attacker\ncould possibly use this issue to cause NTP to enter a loop, resulting in a\ndenial of service. (CVE-2015-7850)\n\nYves Younan and Aleksander Nikolich discovered that NTP incorrectly handled\nascii conversion. A remote attacker could possibly use this issue to cause\nNTP to crash, resulting in a denial of service, or possibly execute\narbitrary code. (CVE-2015-7852)\n\nYves Younan discovered that NTP incorrectly handled reference clock memory.\nA malicious refclock could possibly use this issue to cause NTP to crash,\nresulting in a denial of service, or possibly execute arbitrary code.\n(CVE-2015-7853)\n\nJohn D \"Doug\" Birdwell discovered that NTP incorrectly handled decoding\ncertain bogus values. An attacker could possibly use this issue to cause\nNTP to crash, resulting in a denial of service. (CVE-2015-7855)\n\nStephen Gray discovered that NTP incorrectly handled symmetric association\nauthentication. A remote attacker could use this issue to possibly bypass\nauthentication and alter the system clock. (CVE-2015-7871)\n\nIn the default installation, attackers would be isolated by the NTP\nAppArmor profile.\n","status":"published","published":"2015-10-27T17:02:35Z","modified":"2026-02-10T04:40:56Z","updated_at":"2026-11-02T16:58:10.303275Z"}]}}