The remote AIX host has a version of Network Time Protocol (NTP) installed that is affected by the following vulnerabilities :

  - A divide-by-zero error exists in file include/ntp.h     when handling LOGTOD and ULOGTOD macros in a crafted     NTP packet. An unauthenticated, remote attacker can     exploit this, via crafted NTP packets, to crash ntpd.
    (CVE 2015-5219)

  - A flaw exists in the ntp_crypto.c file due to improper     validation of the 'vallen' value in extension fields. An     unauthenticated, remote attacker can exploit this, via     specially crafted autokey packets, to disclose     sensitive information or cause a denial of service.
    (CVE-2015-7691)

  - A denial of service vulnerability exists in the autokey     functionality due to a failure in the crypto_bob2(),     crypto_bob3(), and cert_sign() functions to properly     validate the 'vallen' value. An unauthenticated, remote     attacker can exploit this, via specially crafted autokey     packets, to crash the NTP service. (CVE-2015-7692)

  - A denial of service vulnerability exists in the     crypto_recv() function in the file ntp_crypto.c related     to autokey functionality. An unauthenticated, remote     attacker can exploit this, via an ongoing flood of NTPv4     autokey requests, to exhaust memory resources.
    (CVE-2015-7701)

  - A denial of service vulnerability exists due to improper     validation of packets containing certain autokey     operations. An unauthenticated, remote attacker can     exploit this, via specially crafted autokey packets,     to crash the NTP service. (CVE-2015-7702)

  - A denial of service vulnerability exists due to a logic     flaw in the authreadkeys() function in the file     authreadkeys.c when handling extended logging where the     log and key files are set to be the same file. An     authenticated, remote attacker can exploit this, via a     crafted set of remote configuration requests, to cause     the NTP service to stop responding. (CVE-2015-7850)

  - A overflow condition exists in the     read_refclock_packet() function in the file ntp_io.c     when handling negative data lengths. A local attacker     can exploit this to crash the NTP service or possibly     gain elevated privileges. (CVE-2015-7853)

  - A denial of service vulnerability exists due to an     assertion flaw in the decodenetnum() function in the     file decodenetnum.c when handling long data values in     mode 6 and 7 packets. An unauthenticated, remote     attacker can exploit this to crash the NTP service.
    (CVE-2015-7855)

The remote Fedora 22 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2015-14212 advisory.

    Security fix for CVE-2015-5146, CVE-2015-5194, CVE-2015-5219, CVE-2015-5195, CVE-2015-5196

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

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

The remote Oracle Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2016-0780 advisory.

    - don't accept server/peer packets with zero origin timestamp (CVE-2015-8138)
    - fix crash with reslist command (CVE-2015-7977, CVE-2015-7978)
    - fix crash with invalid logconfig command (CVE-2015-5194)
    - fix crash when referencing disabled statistic type (CVE-2015-5195)
    - don't hang in sntp with crafted reply (CVE-2015-5219)
    - don't crash with crafted autokey packet (CVE-2015-7691, CVE-2015-7692,       CVE-2015-7702)
    - fix memory leak with autokey (CVE-2015-7701)
    - don't allow setting driftfile and pidfile remotely (CVE-2015-7703)
    - don't crash in ntpq with crafted packet (CVE-2015-7852)
    - check origin timestamp before accepting KoD RATE packet (CVE-2015-7704)

Tenable has extracted the preceding description block directly from the Oracle 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.

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.

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.

The remote Fedora 21 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2015-77bfbc1bcd advisory.

    Security fix for CVE-2015-7704, CVE-2015-5300, CVE-2015-7692, CVE-2015-7871, CVE-2015-7702, CVE-2015-7691,     CVE-2015-7852, CVE-2015-7701

    ----

    Security fix for CVE-2015-5146, CVE-2015-5194, CVE-2015-5219, CVE-2015-5195, CVE-2015-5196

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

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

The remote Redhat Enterprise Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2016:0780 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 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 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 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-2015-7703)

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

    For detailed information on changes in this release, see the Red Hat Enterprise Linux 6.8 Release Notes     and Red Hat Enterprise Linux 6.8 Technical 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.

ID	Name	Product	Family	Published	Updated	Severity
102321	AIX NTP v3 Advisory : ntp_advisory4.asc (IV79942) (IV79943) (IV79944) (IV79945) (IV79946)	Nessus	AIX Local Security Checks	8/9/2017	12/2/2025	critical
86331	Fedora 22 : ntp (2015-14212)	Nessus	Fedora Local Security Checks	10/12/2015	8/29/2025	high
91151	Oracle Linux 6 : ntp (ELSA-2016-0780)	Nessus	Oracle Linux Local Security Checks	5/16/2016	10/22/2024	high
91248	SUSE SLES11 Security Update : ntp (SUSE-SU-2016:1311-1)	Nessus	SuSE Local Security Checks	5/19/2016	1/19/2021	critical
94546	RHEL 7 : ntp (RHSA-2016:2583)	Nessus	Red Hat Local Security Checks	11/4/2016	8/29/2025	high
125008	EulerOS Virtualization 3.0.1.0 : ntp (EulerOS-SA-2019-1555)	Nessus	Huawei Local Security Checks	5/14/2019	5/22/2024	high
89288	Fedora 21 : ntp (2015-77bfbc1bcd)	Nessus	Fedora Local Security Checks	3/4/2016	8/29/2025	critical
91076	RHEL 6 : ntp (RHSA-2016:0780)	Nessus	Red Hat Local Security Checks	5/12/2016	11/4/2024	high

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