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 installation on the remote host is affected by the following vulnerabilities :

  - 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)

  - 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 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)

  - 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 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)

  - 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)

  - 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)

  - 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 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 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)

  - 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)

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.

An update for ntp is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

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 Lichvar (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.

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 :

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2016-2583 advisory.

    - add disable monitor to default ntp.conf [CVE-2013-5211]
    - don't allow spoofed packet to enable symmetric interleaved mode       (CVE-2016-1548)
    - check mode of new source in config command (CVE-2016-2518)
    - make MAC check resilient against timing attack (CVE-2016-1550)
    - 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 key ID in packets authenticated with symmetric key (CVE-2015-7974)
    - fix crash with reslist command (CVE-2015-7977, CVE-2015-7978)
    - don't allow spoofed packets to demobilize associations (CVE-2015-7979,       CVE-2016-1547)
    - don't accept server/peer packets with zero origin timestamp (CVE-2015-8138)
    - fix infinite loop in ntpq/ntpdc (CVE-2015-8158)

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.

The remote Ubuntu 14.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-2783-1 advisory.

    Aleksis Kauppinen discovered that NTP incorrectly handled certain remote config packets. In a non-default     configuration, a remote authenticated attacker could possibly use this issue to cause NTP to crash,     resulting in a denial of service. (CVE-2015-5146)

    Miroslav Lichvar discovered that NTP incorrectly handled logconfig directives. In a non-default     configuration, a remote authenticated attacker could possibly use this issue to cause NTP to crash,     resulting in a denial of service. (CVE-2015-5194)

    Miroslav Lichvar discovered that NTP incorrectly handled certain statistics types. In a non-default     configuration, a remote authenticated attacker could possibly use this issue to cause NTP to crash,     resulting in a denial of service. (CVE-2015-5195)

    Miroslav Lichvar discovered that NTP incorrectly handled certain file paths. In a non-default     configuration, a remote authenticated attacker could possibly use this issue to cause NTP to crash,     resulting in a denial of service, or overwrite certain files. (CVE-2015-5196, CVE-2015-7703)

    Miroslav Lichvar discovered that NTP incorrectly handled certain packets. A remote attacker could possibly     use this issue to cause NTP to hang, resulting in a denial of service. (CVE-2015-5219)

    Aanchal Malhotra, Isaac E. Cohen, and Sharon Goldberg discovered that NTP incorrectly handled restarting     after hitting a panic threshold. A remote attacker could possibly use this issue to alter the system time     on clients. (CVE-2015-5300)

    It was discovered that NTP incorrectly handled autokey data packets. A remote attacker could possibly use     this issue to cause NTP to crash, resulting in a denial of service, or possibly execute arbitrary code.
    (CVE-2015-7691, CVE-2015-7692, CVE-2015-7702)

    It was discovered that NTP incorrectly handled memory when processing certain autokey messages. A remote     attacker could possibly use this issue to cause NTP to consume memory, resulting in a denial of service.
    (CVE-2015-7701)

    Aanchal Malhotra, Isaac E. Cohen, and Sharon Goldberg discovered that NTP incorrectly handled rate     limiting. A remote attacker could possibly use this issue to cause clients to stop updating their clock.
    (CVE-2015-7704, CVE-2015-7705)

    Yves Younan discovered that NTP incorrectly handled logfile and keyfile directives. In a non-default     configuration, a remote authenticated attacker could possibly use this issue to cause NTP to enter a loop,     resulting in a denial of service. (CVE-2015-7850)

    Yves Younan and Aleksander Nikolich discovered that NTP incorrectly handled ascii conversion. A remote     attacker could possibly use this issue to cause NTP to crash, resulting in a denial of service, or     possibly execute arbitrary code. (CVE-2015-7852)

    Yves Younan discovered that NTP incorrectly handled reference clock memory. A malicious refclock could     possibly use this issue to cause NTP to crash, resulting in a denial of service, or possibly execute     arbitrary code. (CVE-2015-7853)

    John D Doug Birdwell discovered that NTP incorrectly handled decoding certain bogus values. An attacker     could possibly use this issue to cause NTP to crash, resulting in a denial of service. (CVE-2015-7855)

    Stephen Gray discovered that NTP incorrectly handled symmetric association authentication. A remote     attacker could use this issue to possibly bypass authentication and alter the system clock.
    (CVE-2015-7871)

    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.

New ntp packages are available for Slackware 13.0, 13.1, 13.37, 14.0, 14.1, and -current to fix security issues.

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

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

The remote Redhat Enterprise Linux 5 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - ntp: Stack-based buffer overflow in ntpq and ntpdc allows denial of service or code execution     (CVE-2018-12327)

  - The monlist feature in ntp_request.c in ntpd in NTP before 4.2.7p26 allows remote attackers to cause a     denial of service (traffic amplification) via forged (1) REQ_MON_GETLIST or (2) REQ_MON_GETLIST_1     requests, as exploited in the wild in December 2013. (CVE-2013-5211)

  - An Information Disclosure vulnerability exists in NTP 4.2.7p25 private (mode 6/7) messages via a     GET_RESTRICT control message, which could let a malicious user obtain sensitive information.
    (CVE-2014-5209)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

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

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

ID	Name	Product	Family	Published	Updated	Severity
94546	RHEL 7 : ntp (RHSA-2016:2583)	Nessus	Red Hat Local Security Checks	11/4/2016	11/4/2024	high
99822	EulerOS 2.0 SP1 : ntp (EulerOS-SA-2016-1060)	Nessus	Huawei Local Security Checks	5/1/2017	1/6/2021	high
95330	CentOS 7 : ntp (CESA-2016:2583)	Nessus	CentOS Local Security Checks	11/28/2016	1/4/2021	high
95850	Scientific Linux Security Update : ntp on SL7.x x86_64 (20161103)	Nessus	Scientific Linux Local Security Checks	12/15/2016	1/14/2021	high
94705	Oracle Linux 7 : ntp (ELSA-2016-2583)	Nessus	Oracle Linux Local Security Checks	11/11/2016	10/22/2024	high
86630	Ubuntu 14.04 LTS : NTP vulnerabilities (USN-2783-1)	Nessus	Ubuntu Local Security Checks	10/28/2015	8/27/2024	critical
86664	Slackware 13.0 / 13.1 / 13.37 / 14.0 / 14.1 / current : ntp (SSA:2015-302-03)	Nessus	Slackware Local Security Checks	10/30/2015	1/14/2021	critical
86027	Fedora 23 : ntp-4.2.6p5-33.fc23 (2015-14213)	Nessus	Fedora Local Security Checks	9/21/2015	1/11/2021	high
86331	Fedora 22 : ntp-4.2.6p5-33.fc22 (2015-14212)	Nessus	Fedora Local Security Checks	10/12/2015	1/11/2021	high
198530	RHEL 5 : ntp (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	6/3/2024	6/3/2024	critical
89288	Fedora 21 : ntp-4.2.6p5-34.fc21 (2015-77bfbc1bcd)	Nessus	Fedora Local Security Checks	3/4/2016	1/11/2021	critical

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