ntp was updated to version 4.2.8p6 to fix 28 security issues.

Major functional changes :

  - The 'sntp' commandline tool changed its option handling     in a major way, some options have been renamed or     dropped.

  - 'controlkey 1' is added during update to ntp.conf to     allow sntp to work.

  - The local clock is being disabled during update.

  - ntpd is no longer running chrooted.

Other functional changes :

  - ntp-signd is installed.

  - 'enable mode7' can be added to the configuration to     allow ntdpc to work as compatibility mode option.

  - 'kod' was removed from the default restrictions.

  - SHA1 keys are used by default instead of MD5 keys.

Also yast2-ntp-client was updated to match some sntp syntax changes.
(bsc#937837)

These security issues were fixed :

  - CVE-2015-8158: Fixed potential infinite loop in ntpq     (bsc#962966).

  - CVE-2015-8138: Zero Origin Timestamp Bypass     (bsc#963002).

  - CVE-2015-7979: Off-path Denial of Service (DoS) attack     on authenticated broadcast mode (bsc#962784).

  - CVE-2015-7978: Stack exhaustion in recursive traversal     of restriction list (bsc#963000).

  - CVE-2015-7977: reslist NULL pointer dereference     (bsc#962970).

  - CVE-2015-7976: ntpq saveconfig command allows dangerous     characters in filenames (bsc#962802).

  - CVE-2015-7975: nextvar() missing length check     (bsc#962988).

  - CVE-2015-7974: Skeleton Key: Missing key check allows     impersonation between authenticated peers (bsc#962960).

  - CVE-2015-7973: Replay attack on authenticated broadcast     mode (bsc#962995).

  - CVE-2015-8140: ntpq vulnerable to replay attacks     (bsc#962994).

  - CVE-2015-8139: Origin Leak: ntpq and ntpdc, disclose     origin (bsc#962997).

  - CVE-2015-5300: MITM attacker could have forced ntpd to     make a step larger than the panic threshold     (bsc#951629).

  - CVE-2015-7871: NAK to the Future: Symmetric association     authentication bypass via crypto-NAK (bsc#951608).

  - CVE-2015-7855: decodenetnum() will ASSERT botch instead     of returning FAIL on some bogus values (bsc#951608).

  - CVE-2015-7854: Password Length Memory Corruption     Vulnerability (bsc#951608).

  - CVE-2015-7853: Invalid length data provided by a custom     refclock driver could cause a buffer overflow     (bsc#951608).

  - CVE-2015-7852: ntpq atoascii() Memory Corruption     Vulnerability (bsc#951608).

  - CVE-2015-7851: saveconfig Directory Traversal     Vulnerability (bsc#951608).

  - CVE-2015-7850: remote config logfile-keyfile     (bsc#951608).

  - CVE-2015-7849: trusted key use-after-free (bsc#951608).

  - CVE-2015-7848: mode 7 loop counter underrun     (bsc#951608).

  - CVE-2015-7701: Slow memory leak in CRYPTO_ASSOC     (bsc#951608).

  - CVE-2015-7703: configuration directives 'pidfile' and     'driftfile' should only be allowed locally (bsc#951608).

  - CVE-2015-7704, CVE-2015-7705: Clients that receive a KoD     should validate the origin timestamp field (bsc#951608).

  - CVE-2015-7691, CVE-2015-7692, CVE-2015-7702: Incomplete     autokey data packet length checks (bsc#951608).

The update package also includes non-security fixes. See advisory for details.

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

This network time protocol server ntp was updated to 4.2.8p6 to fix the following issues :

Also yast2-ntp-client was updated to match some sntp syntax changes.
(bsc#937837)

Major functional changes :

  - The 'sntp' commandline tool changed its option handling     in a major way.

  - 'controlkey 1' is added during update to ntp.conf to     allow sntp to work.

  - The local clock is being disabled during update.

  - ntpd is no longer running chrooted.

Other functional changes :

  - ntp-signd is installed.

  - 'enable mode7' can be added to the configuration to     allow ntdpc to work as compatibility mode option.

  - 'kod' was removed from the default restrictions.

  - SHA1 keys are used by default instead of MD5 keys.

These security issues were fixed :

  - CVE-2015-5219: An endless loop due to incorrect     precision to double conversion (bsc#943216).

  - CVE-2015-8158: Fixed potential infinite loop in ntpq     (bsc#962966).

  - CVE-2015-8138: Zero Origin Timestamp Bypass     (bsc#963002).

  - CVE-2015-7979: Off-path Denial of Service (DoS) attack     on authenticated broadcast mode (bsc#962784).

  - CVE-2015-7978: Stack exhaustion in recursive traversal     of restriction list (bsc#963000).

  - CVE-2015-7977: reslist NULL pointer dereference     (bsc#962970).

  - CVE-2015-7976: ntpq saveconfig command allows dangerous     characters in filenames (bsc#962802).

  - CVE-2015-7975: nextvar() missing length check     (bsc#962988).

  - CVE-2015-7974: Skeleton Key: Missing key check allows     impersonation between authenticated peers (bsc#962960).

  - CVE-2015-7973: Replay attack on authenticated broadcast     mode (bsc#962995).

  - CVE-2015-8140: ntpq vulnerable to replay attacks     (bsc#962994).

  - CVE-2015-8139: Origin Leak: ntpq and ntpdc, disclose     origin (bsc#962997).

  - CVE-2015-5300: MITM attacker could have forced ntpd to     make a step larger than the panic threshold     (bsc#951629).

  - CVE-2015-7871: NAK to the Future: Symmetric association     authentication bypass via crypto-NAK (bsc#951608).

  - CVE-2015-7855: decodenetnum() will ASSERT botch instead     of returning FAIL on some bogus values (bsc#951608).

  - CVE-2015-7854: Password Length Memory Corruption     Vulnerability (bsc#951608).

  - CVE-2015-7853: Invalid length data provided by a custom     refclock driver could cause a buffer overflow     (bsc#951608).

  - CVE-2015-7852: ntpq atoascii() Memory Corruption     Vulnerability (bsc#951608).

  - CVE-2015-7851: saveconfig Directory Traversal     Vulnerability (bsc#951608).

  - CVE-2015-7850: remote config logfile-keyfile     (bsc#951608).

  - CVE-2015-7849: trusted key use-after-free (bsc#951608).

  - CVE-2015-7848: mode 7 loop counter underrun     (bsc#951608).

  - CVE-2015-7701: Slow memory leak in CRYPTO_ASSOC     (bsc#951608).

  - CVE-2015-7703: configuration directives 'pidfile' and     'driftfile' should only be allowed locally (bsc#951608).

  - CVE-2015-7704, CVE-2015-7705: Clients that receive a KoD     should validate the origin timestamp field (bsc#951608).

  - CVE-2015-7691, CVE-2015-7692, CVE-2015-7702: Incomplete     autokey data packet length checks (bsc#951608).

The update package also includes non-security fixes. See advisory for details.

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2016:2583 advisory.

    The Network Time Protocol (NTP) is used to synchronize a computer's time with another referenced time     source. These packages include the ntpd service which continuously adjusts system time and utilities used     to query and configure the ntpd service.

    Security Fix(es):

    * It was found that the fix for CVE-2014-9750 was incomplete: three issues were found in the value length     checks in NTP's ntp_crypto.c, where a packet with particular autokey operations that contained malicious     data was not always being completely validated. A remote attacker could use a specially crafted NTP packet     to crash ntpd. (CVE-2015-7691, CVE-2015-7692, CVE-2015-7702)

    * A memory leak flaw was found in ntpd's CRYPTO_ASSOC. If ntpd was configured to use autokey     authentication, an attacker could send packets to ntpd that would, after several days of ongoing attack,     cause it to run out of memory. (CVE-2015-7701)

    * An off-by-one flaw, leading to a buffer overflow, was found in cookedprint functionality of ntpq. A     specially crafted NTP packet could potentially cause ntpq to crash. (CVE-2015-7852)

    * A NULL pointer dereference flaw was found in the way ntpd processed 'ntpdc reslist' commands that     queried restriction lists with a large amount of entries. A remote attacker could potentially use this     flaw to crash ntpd. (CVE-2015-7977)

    * A stack-based buffer overflow flaw was found in the way ntpd processed 'ntpdc reslist' commands that     queried restriction lists with a large amount of entries. A remote attacker could use this flaw to crash     ntpd. (CVE-2015-7978)

    * It was found that when NTP was configured in broadcast mode, a remote attacker could broadcast packets     with bad authentication to all clients. The clients, upon receiving the malformed packets, would break the     association with the broadcast server, causing them to become out of sync over a longer period of time.
    (CVE-2015-7979)

    * It was found that ntpd could crash due to an uninitialized variable when processing malformed logconfig     configuration commands. (CVE-2015-5194)

    * It was found that ntpd would exit with a segmentation fault when a statistics type that was not enabled     during compilation (e.g. timingstats) was referenced by the statistics or filegen configuration command.
    (CVE-2015-5195)

    * It was found that NTP's :config command could be used to set the pidfile and driftfile paths without any     restrictions. A remote attacker could use this flaw to overwrite a file on the file system with a file     containing the pid of the ntpd process (immediately) or the current estimated drift of the system clock     (in hourly intervals). (CVE-2015-5196, CVE-2015-7703)

    * It was discovered that the sntp utility could become unresponsive due to being caught in an infinite     loop when processing a crafted NTP packet. (CVE-2015-5219)

    * A flaw was found in the way NTP verified trusted keys during symmetric key authentication. An     authenticated client (A) could use this flaw to modify a packet sent between a server (B) and a client (C)     using a key that is different from the one known to the client (A). (CVE-2015-7974)

    * A flaw was found in the way the ntpq client processed certain incoming packets in a loop in the     getresponse() function. A remote attacker could potentially use this flaw to crash an ntpq client     instance. (CVE-2015-8158)

    The CVE-2015-5219 and CVE-2015-7703 issues were discovered by Miroslav Lichvr (Red Hat).

    Additional Changes:

    For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.3 Release Notes     linked from the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Network Time Foundation reports :

NTF's NTP Project has been notified of the following low- and medium-severity vulnerabilities that are fixed in ntp-4.2.8p6, released on Tuesday, 19 January 2016 :

- Bug 2948 / CVE-2015-8158: Potential Infinite Loop in ntpq. Reported by Cisco ASIG.

- Bug 2945 / CVE-2015-8138: origin: Zero Origin Timestamp Bypass.
Reported by Cisco ASIG.

- Bug 2942 / CVE-2015-7979: Off-path Denial of Service (DoS) attack on authenticated broadcast mode. Reported by Cisco ASIG.

- Bug 2940 / CVE-2015-7978: Stack exhaustion in recursive traversal of restriction list. Reported by Cisco ASIG.

- Bug 2939 / CVE-2015-7977: reslist NULL pointer dereference. Reported by Cisco ASIG.

- Bug 2938 / CVE-2015-7976: ntpq saveconfig command allows dangerous characters in filenames. Reported by Cisco ASIG.

- Bug 2937 / CVE-2015-7975: nextvar() missing length check. Reported by Cisco ASIG.

- Bug 2936 / CVE-2015-7974: Skeleton Key: Missing key check allows impersonation between authenticated peers. Reported by Cisco ASIG.

- Bug 2935 / CVE-2015-7973: Deja Vu: Replay attack on authenticated broadcast mode. Reported by Cisco ASIG.

Additionally, mitigations are published for the following two issues :

- Bug 2947 / CVE-2015-8140: ntpq vulnerable to replay attacks.
Reported by Cisco ASIG.

- Bug 2946 / CVE-2015-8139: Origin Leak: ntpq and ntpdc, disclose origin. Reported by Cisco ASIG.

The remote Ubuntu 14.04 LTS / 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-3096-1 advisory.

    Aanchal Malhotra discovered that NTP incorrectly handled authenticated broadcast mode. A remote attacker     could use this issue to perform a replay attack. (CVE-2015-7973)

    Matt Street discovered that NTP incorrectly verified peer associations of symmetric keys. A remote     attacker could use this issue to perform an impersonation attack. (CVE-2015-7974)

    Jonathan Gardner discovered that the NTP ntpq utility incorrectly handled memory. An attacker could     possibly use this issue to cause ntpq to crash, resulting in a denial of service. This issue only affected     Ubuntu 16.04 LTS. (CVE-2015-7975)

    Jonathan Gardner discovered that the NTP ntpq utility incorrectly handled dangerous characters in     filenames. An attacker could possibly use this issue to overwrite arbitrary files. (CVE-2015-7976)

    Stephen Gray discovered that NTP incorrectly handled large restrict lists. An attacker could use this     issue to cause NTP to crash, resulting in a denial of service. (CVE-2015-7977, CVE-2015-7978)

    Aanchal Malhotra discovered that NTP incorrectly handled authenticated broadcast mode. A remote attacker     could use this issue to cause NTP to crash, resulting in a denial of service. (CVE-2015-7979)

    Jonathan Gardner discovered that NTP incorrectly handled origin timestamp checks. A remote attacker could     use this issue to spoof peer servers. (CVE-2015-8138)

    Jonathan Gardner discovered that the NTP ntpq utility did not properly handle certain incorrect values. An     attacker could possibly use this issue to cause ntpq to hang, resulting in a denial of service.
    (CVE-2015-8158)

    It was discovered that the NTP cronjob incorrectly cleaned up the statistics directory. A local attacker     could possibly use this to escalate privileges. (CVE-2016-0727)

    Stephen Gray and Matthew Van Gundy discovered that NTP incorrectly validated crypto-NAKs. A remote     attacker could possibly use this issue to prevent clients from synchronizing. (CVE-2016-1547)

    Miroslav Lichvar and Jonathan Gardner discovered that NTP incorrectly handled switching to interleaved     symmetric mode. A remote attacker could possibly use this issue to prevent clients from synchronizing.
    (CVE-2016-1548)

    Matthew Van Gundy, Stephen Gray and Loganaden Velvindron discovered that NTP incorrectly handled message     authentication. A remote attacker could possibly use this issue to recover the message digest key.
    (CVE-2016-1550)

    Yihan Lian discovered that NTP incorrectly handled duplicate IPs on unconfig directives. An authenticated     remote attacker could possibly use this issue to cause NTP to crash, resulting in a denial of service.
    (CVE-2016-2516)

    Yihan Lian discovered that NTP incorrectly handled certail peer associations. A remote attacker could     possibly use this issue to cause NTP to crash, resulting in a denial of service. (CVE-2016-2518)

    Jakub Prokes discovered that NTP incorrectly handled certain spoofed packets. A remote attacker could     possibly use this issue to cause a denial of service. (CVE-2016-4954)

    Miroslav Lichvar discovered that NTP incorrectly handled certain packets when autokey is enabled. A remote     attacker could possibly use this issue to cause a denial of service. (CVE-2016-4955)

    Miroslav Lichvar discovered that NTP incorrectly handled certain spoofed broadcast packets. A remote     attacker could possibly use this issue to cause a denial of service. (CVE-2016-4956)

    In the default installation, attackers would be isolated by the NTP AppArmor profile.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Several vulnerabilities were discovered in the Network Time Protocol daemon and utility programs :

  - CVE-2015-7974     Matt Street discovered that insufficient key validation     allows impersonation attacks between authenticated     peers.

  - CVE-2015-7977 CVE-2015-7978     Stephen Gray discovered that a NULL pointer dereference     and a buffer overflow in the handling of 'ntpdc reslist'     commands may result in denial of service.

  - CVE-2015-7979     Aanchal Malhotra discovered that if NTP is configured     for broadcast mode, an attacker can send malformed     authentication packets which break associations with the     server for other broadcast clients.

  - CVE-2015-8138     Matthew van Gundy and Jonathan Gardner discovered that     missing validation of origin timestamps in ntpd clients     may result in denial of service.

  - CVE-2015-8158     Jonathan Gardner discovered that missing input     sanitising in ntpq may result in denial of service.

  - CVE-2016-1547     Stephen Gray and Matthew van Gundy discovered that     incorrect handling of crypto NAK packets may result in     denial of service.

  - CVE-2016-1548     Jonathan Gardner and Miroslav Lichvar discovered that     ntpd clients could be forced to change from basic     client/server mode to interleaved symmetric mode,     preventing time synchronisation.

  - CVE-2016-1550     Matthew van Gundy, Stephen Gray and Loganaden Velvindron     discovered that timing leaks in the packet     authentication code could result in recovery of a     message digest.

  - CVE-2016-2516     Yihan Lian discovered that duplicate IPs on 'unconfig'     directives will trigger an assert.

  - CVE-2016-2518     Yihan Lian discovered that an OOB memory access could     potentially crash ntpd.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - The getresponse function in ntpq in NTP versions before 4.2.8p9 and 4.3.x before 4.3.90 allows remote     attackers to cause a denial of service (infinite loop) via crafted packets with incorrect values.
    (CVE-2015-8158)

Note that Nessus relies on the presence of the package as reported by the vendor.

This update for ntp fixes the following issues :

  - Update to 4.2.8p7 (boo#977446) :

  - CVE-2016-1547, boo#977459: Validate crypto-NAKs, AKA:
    CRYPTO-NAK DoS.

  - CVE-2016-1548, boo#977461: Interleave-pivot

  - CVE-2016-1549, boo#977451: Sybil vulnerability:
    ephemeral association attack.

  - CVE-2016-1550, boo#977464: Improve NTP security against     buffer comparison timing attacks.

  - CVE-2016-1551, boo#977450: Refclock impersonation     vulnerability

  - CVE-2016-2516, boo#977452: Duplicate IPs on unconfig     directives will cause an assertion botch in ntpd.

  - CVE-2016-2517, boo#977455: remote configuration     trustedkey/ requestkey/controlkey values are not     properly validated.

  - CVE-2016-2518, boo#977457: Crafted addpeer with hmode >     7 causes array wraparound with MATCH_ASSOC.

  - CVE-2016-2519, boo#977458: ctl_getitem() return value     not always checked.

  - integrate ntp-fork.patch

  - Improve the fixes for: CVE-2015-7704, CVE-2015-7705,     CVE-2015-7974

  - Restrict the parser in the startup script to the first     occurrance of 'keys' and 'controlkey' in ntp.conf     (boo#957226).

  - Enable compile-time support for MS-SNTP     (--enable-ntp-signd). This replaces the w32 patches in     4.2.4 that added the authreg directive. (fate#320758).

  - Fix ntp-sntp-dst.patch (boo#975496).

  - Call /usr/sbin/sntp with full path to synchronize in     start-ntpd. When run as cron job, /usr/sbin/ is not in     the path, which caused the synchronization to fail.
    (boo#962318)

  - Speedup ntpq (boo#782060, ntp-speedup-ntpq.patch).

  - Sync service files with openSUSE Factory.

  - Fix the TZ offset output of sntp during DST     (boo#951559).

  - Add ntp-fork.patch and build with threads disabled to     allow name resolution even when running chrooted.

  - Update to 4.2.8p6 :

  - CVE-2015-8158, boo#962966: Potential Infinite Loop in     ntpq.

  - CVE-2015-8138, boo#963002: origin: Zero Origin Timestamp     Bypass.

  - CVE-2015-7979, boo#962784: Off-path Denial of Service     (DoS) attack on authenticated broadcast mode.

  - CVE-2015-7978, boo#963000: Stack exhaustion in recursive     traversal of restriction list.

  - CVE-2015-7977, boo#962970: reslist NULL pointer     dereference.

  - CVE-2015-7976, boo#962802: ntpq saveconfig command     allows dangerous characters in filenames.

  - CVE-2015-7975, boo#962988: nextvar() missing length     check.

  - CVE-2015-7974, boo#962960: Skeleton Key: Missing key     check allows impersonation between authenticated peers.

  - CVE-2015-7973, boo#962995: Deja Vu: Replay attack on     authenticated broadcast mode.

  - CVE-2015-8140: ntpq vulnerable to replay attacks.

  - CVE-2015-8139: Origin Leak: ntpq and ntpdc, disclose     origin.

  - CVE-2015-5300, boo#951629: Small-step/Big-step.

  - Add /var/db/ntp-kod (boo#916617).

  - Add ntp-ENOBUFS.patch to limit a warning that might     happen quite a lot on loaded systems (boo#956773).

  - add ntp.bug2965.diff (boo#954982)

  - fixes regression in 4.2.8p4 update

  - Update to 4.2.8p4 to fix several security issues     (boo#951608) :

  - CVE-2015-7871: NAK to the Future: Symmetric association     authentication bypass via crypto-NAK

  - CVE-2015-7855: decodenetnum() will ASSERT botch instead     of returning FAIL on some bogus values

  - CVE-2015-7854: Password Length Memory Corruption     Vulnerability

  - CVE-2015-7853: Invalid length data provided by a custom     refclock driver could cause a buffer overflow

  - CVE-2015-7852 ntpq atoascii() Memory Corruption     Vulnerability

  - CVE-2015-7851 saveconfig Directory Traversal     Vulnerability

  - CVE-2015-7850 remote config logfile-keyfile

  - CVE-2015-7849 trusted key use-after-free

  - CVE-2015-7848 mode 7 loop counter underrun

  - CVE-2015-7701 Slow memory leak in CRYPTO_ASSOC

  - CVE-2015-7703 configuration directives 'pidfile' and     'driftfile' should only be allowed locally

  - CVE-2015-7704, CVE-2015-7705 Clients that receive a KoD     should validate the origin timestamp field

  - CVE-2015-7691, CVE-2015-7692, CVE-2015-7702 Incomplete     autokey data packet length checks

  - obsoletes ntp-memlock.patch.

  - Add a controlkey line to /etc/ntp.conf if one does not     already exist to allow runtime configuuration via ntpq.

  - Temporarily disable memlock to avoid problems due to     high memory usage during name resolution (boo#946386,     ntp-memlock.patch).

  - Use SHA1 instead of MD5 for symmetric keys (boo#905885).

  - Improve runtime configuration :

  - Read keytype from ntp.conf

  - Don't write ntp keys to syslog.

  - Fix legacy action scripts to pass on command line     arguments.

  - Remove ntp.1.gz, it wasn't installed anymore.

  - Remove ntp-4.2.7-rh-manpages.tar.gz and only keep     ntptime.8.gz. The rest is partially irrelevant,     partially redundant and potentially outdated     (boo#942587).

  - Remove 'kod' from the restrict line in ntp.conf     (boo#944300).

  - Use ntpq instead of deprecated ntpdc in start-ntpd     (boo#936327).

  - Add a controlkey to ntp.conf to make the above work.

  - Don't let 'keysdir' lines in ntp.conf trigger the 'keys'     parser.

  - Disable mode 7 (ntpdc) again, now that we don't use it     anymore.

  - Add 'addserver' as a new legacy action.

  - Fix the comment regarding addserver in ntp.conf     (boo#910063).

  - Update to version 4.2.8p3 which incorporates all     security fixes and most other patches we have so far     (fate#319040). More information on:
    http://archive.ntp.org/ntp4/ChangeLog-stable

  - Disable chroot by default (boo#926510).

  - Enable ntpdc for backwards compatibility (boo#920238).

  - Security fix: ntp-keygen may generate non-random     symmetric keys

Several vulnerabilities were discovered in the Network Time Protocol daemon and utility programs :

CVE-2015-7974

Matt Street discovered that insufficient key validation allows impersonation attacks between authenticated peers.

CVE-2015-7977 / CVE-2015-7978

Stephen Gray discovered that a NULL pointer dereference and a buffer overflow in the handling of 'ntpdc reslist' commands may result in denial of service.

CVE-2015-7979

Aanchal Malhotra discovered that if NTP is configured for broadcast mode, an attacker can send malformed authentication packets which break associations with the server for other broadcast clients.

CVE-2015-8138

Matthew van Gundy and Jonathan Gardner discovered that missing validation of origin timestamps in ntpd clients may result in denial of service.

CVE-2015-8158

Jonathan Gardner discovered that missing input sanitising in ntpq may result in denial of service.

CVE-2016-1547

Stephen Gray and Matthew van Gundy discovered that incorrect handling of crypto NAK packets my result in denial of service.

CVE-2016-1548

Jonathan Gardner and Miroslav Lichvar discovered that ntpd clients could be forced to change from basic client/server mode to interleaved symmetric mode, preventing time synchronisation.

CVE-2016-1550

Matthew van Gundy, Stephen Gray and Loganaden Velvindron discovered that timing leaks in the the packet authentication code could result in recovery of a message digest.

CVE-2016-2516

Yihan Lian discovered that duplicate IPs on 'unconfig' directives will trigger an assert.

CVE-2016-2518

Yihan Lian discovered that an OOB memory access could potentially crash ntpd.

For Debian 7 'Wheezy', these problems have been fixed in version 1:4.2.6.p5+dfsg-2+deb7u7.

We recommend that you upgrade your ntp packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the versions of the ntp packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - It was found that when ntp is configured with rate     limiting for all associations the limits are also     applied to responses received from its configured     sources. A remote attacker who knows the sources can     cause a denial of service by preventing ntpd from     accepting valid responses from its     sources.(CVE-2016-7426)

  - ntpq in NTP before 4.2.8p7 allows remote attackers to     obtain origin timestamps and then impersonate peers via     unspecified vectors.(CVE-2015-8139)

  - A NULL pointer dereference flaw was found in the way     ntpd processed 'ntpdc reslist' commands that queried     restriction lists with a large amount of entries. A     remote attacker could potentially use this flaw to     crash ntpd.(CVE-2015-7977)

  - A vulnerability was found in NTP, in the parsing of     packets from the /dev/datum device. A malicious device     could send crafted messages, causing ntpd to     crash.(CVE-2017-6462)

  - The process_packet function in ntp_proto.c in ntpd in     NTP 4.x before 4.2.8p8 allows remote attackers to cause     a denial of service (peer-variable modification) by     sending spoofed packets from many source IP addresses     in a certain scenario, as demonstrated by triggering an     incorrect leap indication.(CVE-2016-4954)

  - It was found that ntpd could crash due to an     uninitialized variable when processing malformed     logconfig configuration commands.(CVE-2015-5194)

  - It was discovered that the sntp utility could become     unresponsive due to being caught in an infinite loop     when processing a crafted NTP packet.(CVE-2015-5219)

  - It was discovered that ntpd as a client did not     correctly check the originate timestamp in received     packets. A remote attacker could use this flaw to send     a crafted packet to an ntpd client that would     effectively disable synchronization with the server, or     push arbitrary offset/delay measurements to modify the     time on the client.(CVE-2015-8138)

  - It was found that the fix for CVE-2014-9750 was     incomplete: three issues were found in the value length     checks in NTP's ntp_crypto.c, where a packet with     particular autokey operations that contained malicious     data was not always being completely validated. A     remote attacker could use a specially crafted NTP     packet to crash ntpd.(CVE-2015-7702)

  - Multiple buffer overflow flaws were discovered in     ntpd's crypto_recv(), ctl_putdata(), and configure()     functions. A remote attacker could use either of these     flaws to send a specially crafted request packet that     could crash ntpd or, potentially, execute arbitrary     code with the privileges of the ntp user. Note: the     crypto_recv() flaw requires non default configurations     to be active, while the ctl_putdata() flaw, by default,     can only be exploited via local attackers, and the     configure() flaw requires additional authentication to     exploit.(CVE-2014-9295)

  - It was found that an ntpd client could be forced to     change from basic client/server mode to the interleaved     symmetric mode. A remote attacker could use a spoofed     packet that, when processed by an ntpd client, would     cause that client to reject all future legitimate     server responses, effectively disabling time     synchronization on that client.(CVE-2016-1548)

  - A flaw was found in the way NTP's libntp performed     message authentication. An attacker able to observe the     timing of the comparison function used in packet     authentication could potentially use this flaw to     recover the message digest.(CVE-2016-1550)

  - A denial of service flaw was found in the way NTP     handled preemptable client associations. A remote     attacker could send several crypto NAK packets to a     victim client, each with a spoofed source address of an     existing associated peer, preventing that client from     synchronizing its time.(CVE-2016-1547)

  - It was found that the fix for CVE-2014-9750 was     incomplete: three issues were found in the value length     checks in NTP's ntp_crypto.c, where a packet with     particular autokey operations that contained malicious     data was not always being completely validated. A     remote attacker could use a specially crafted NTP     packet to crash ntpd.(CVE-2015-7692)

  - A flaw was found in the way the ntpq client processed     certain incoming packets in a loop in the getresponse()     function. A remote attacker could potentially use this     flaw to crash an ntpq client instance.(CVE-2015-8158)

  - It was discovered that ntpd as a client did not     correctly check timestamps in Kiss-of-Death packets. A     remote attacker could use this flaw to send a crafted     Kiss-of-Death packet to an ntpd client that would     increase the client's polling interval value, and     effectively disable synchronization with the     server.(CVE-2015-7704)

  - A flaw was found in the control mode functionality of     ntpd. A remote attacker could send a crafted control     mode packet which could lead to information disclosure     or result in DDoS amplification attacks.(CVE-2016-9310)

  - A vulnerability was discovered in the NTP server's     parsing of configuration directives. A remote,     authenticated attacker could cause ntpd to crash by     sending a crafted message.(CVE-2017-6464)

  - It was found that ntpd automatically generated weak     keys for its internal use if no ntpdc request     authentication key was specified in the ntp.conf     configuration file. A remote attacker able to match the     configured IP restrictions could guess the generated     key, and possibly use it to send ntpdc query or     configuration requests.(CVE-2014-9293)

  - A denial of service flaw was found in the way NTP hosts     that were peering with each other authenticated     themselves before updating their internal state     variables. An attacker could send packets to one peer     host, which could cascade to other peers, and stop the     synchronization process among the reached     peers.(CVE-2015-1799)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
90991	SUSE SLED12 / SLES12 Security Update : ntp (SUSE-SU-2016:1247-1)	Nessus	SuSE Local Security Checks	2016/5/9	2021/1/6	critical
91248	SUSE SLES11 Security Update : ntp (SUSE-SU-2016:1311-1)	Nessus	SuSE Local Security Checks	2016/5/19	2021/1/19	critical
94546	RHEL 7 : ntp (RHSA-2016:2583)	Nessus	Red Hat Local Security Checks	2016/11/4	2025/8/29	high
88068	FreeBSD : ntp -- multiple vulnerabilities (5237f5d7-c020-11e5-b397-d050996490d0)	Nessus	FreeBSD Local Security Checks	2016/1/22	2021/1/4	high
93896	Ubuntu 14.04 LTS / 16.04 LTS : NTP vulnerabilities (USN-3096-1)	Nessus	Ubuntu Local Security Checks	2016/10/6	2025/9/3	high
92571	Debian DSA-3629-1 : ntp - security update	Nessus	Debian Local Security Checks	2016/7/27	2026/1/30	high
219021	Linux Distros Unpatched Vulnerability : CVE-2015-8158	Nessus	Misc.	2025/3/4	2025/9/4	medium
91403	openSUSE Security Update : ntp (openSUSE-2016-649)	Nessus	SuSE Local Security Checks	2016/6/1	2021/1/19	critical
92546	Debian DLA-559-1 : ntp security update	Nessus	Debian Local Security Checks	2016/7/26	2026/1/30	high
125008	EulerOS Virtualization 3.0.1.0 : ntp (EulerOS-SA-2019-1555)	Nessus	Huawei Local Security Checks	2019/5/14	2024/5/22	high

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