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)

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 use this flaw to crash the ntpd process. (CVE-2015-7977)

It was found that NTP does not verify peer associations of symmetric keys when authenticating packets, which might allow remote attackers to conduct impersonation attacks via an arbitrary trusted key.
(CVE-2015-7974)

A stack-based buffer overflow 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 the ntpd process. (CVE-2015-7978)

It was found that when NTP is configured in broadcast mode, an off-path attacker could broadcast packets with bad authentication (wrong key, mismatched key, incorrect MAC, etc) to all clients. The clients, upon receiving the malformed packets, would break the association with the broadcast server. This could cause the time on affected clients to become out of sync over a longer period of time.
(CVE-2015-7979)

A flaw was found in the way the ntpq client certain processed 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)

A flaw was found in ntpd that allows remote attackers to cause a denial of service (ephemeral-association demobilization) by sending a spoofed crypto-NAK packet with incorrect authentication data at a certain time. (CVE-2016-4953)

(Updated 2016-10-18: CVE-2016-4953 was fixed in this release but was not previously part of this errata.)

Security fix for CVE-2015-7974, CVE-2015-8138, CVE-2015-7977, CVE-2015-7978, CVE-2015-7979, CVE-2015-8158

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.

ntp was updated to version 4.2.8p6 to fix 12 security issues.

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).

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 version of NTP installed on the remote AIX host is affected by the following vulnerabilities :

  - A flaw exists in the receive() function due to the use     of authenticated broadcast mode. A man-in-the-middle     attacker can exploit this to conduct a replay attack.
    (CVE-2015-7973)

  - A NULL pointer dereference flaw exists in ntp_request.c     that is triggered when handling ntpdc relist commands.
    A remote attacker can exploit this, via a specially     crafted request, to crash the service, resulting in a     denial of service condition. (CVE-2015-7977)

  - An unspecified flaw exists in authenticated broadcast     mode. A remote attacker can exploit this, via specially     crafted packets, to cause a denial of service condition.
    (CVE-2015-7979)

  - A flaw exists in ntpq and ntpdc that allows a remote     attacker to disclose sensitive information in     timestamps. (CVE-2015-8139)

  - A flaw exists in the ntpq protocol that is triggered     during the handling of an improper sequence of numbers.
    A man-in-the-middle attacker can exploit this to conduct     a replay attack. (CVE-2015-8140)

  - A flaw exists in the ntpq client that is triggered when     handling packets that cause a loop in the getresponse()     function. A remote attacker can exploit this to cause an     infinite loop, resulting in a denial of service     condition. (CVE-2015-8158)

According to its self-reported version number, the remote pfSense install is prior to 2.3. It is, therefore, affected by multiple vulnerabilities.

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

NTP was updated to version 4.2.8p8 to fix several security issues and to ensure the continued maintainability of the package.

These security issues were fixed :

CVE-2016-4953: Bad authentication demobilized ephemeral associations (bsc#982065).

CVE-2016-4954: Processing spoofed server packets (bsc#982066).

CVE-2016-4955: Autokey association reset (bsc#982067).

CVE-2016-4956: Broadcast interleave (bsc#982068).

CVE-2016-4957: CRYPTO_NAK crash (bsc#982064).

CVE-2016-1547: Validate crypto-NAKs to prevent ACRYPTO-NAK DoS (bsc#977459).

CVE-2016-1548: Prevent the change of time of an ntpd client or denying service to an ntpd client by forcing it to change from basic client/server mode to interleaved symmetric mode (bsc#977461).

CVE-2016-1549: Sybil vulnerability: ephemeral association attack (bsc#977451).

CVE-2016-1550: Improve security against buffer comparison timing attacks (bsc#977464).

CVE-2016-1551: Refclock impersonation vulnerability (bsc#977450)y

CVE-2016-2516: Duplicate IPs on unconfig directives could have caused an assertion botch in ntpd (bsc#977452).

CVE-2016-2517: Remote configuration trustedkey/ requestkey/controlkey values are not properly validated (bsc#977455).

CVE-2016-2518: Crafted addpeer with hmode > 7 causes array wraparound with MATCH_ASSOC (bsc#977457).

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

CVE-2015-8158: 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 allowed dangerous characters in filenames (bsc#962802).

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

CVE-2015-7974: NTP did not verify peer associations of symmetric keys when authenticating packets, which might have allowed remote attackers to conduct impersonation attacks via an arbitrary trusted key, aka a 'skeleton' key (bsc#962960).

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

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

CVE-2015-5194: Crash with crafted logconfig configuration command (bsc#943218).

CVE-2015-7871: NAK to the Future: Symmetric association authentication bypass via crypto-NAK (bsc#952611).

CVE-2015-7855: decodenetnum() will ASSERT botch instead of returning FAIL on some bogus values (bsc#952611).

CVE-2015-7854: Password Length Memory Corruption Vulnerability (bsc#952611).

CVE-2015-7853: Invalid length data provided by a custom refclock driver could cause a buffer overflow (bsc#952611).

CVE-2015-7852: ntpq atoascii() Memory Corruption Vulnerability (bsc#952611).

CVE-2015-7851: saveconfig Directory Traversal Vulnerability (bsc#952611).

CVE-2015-7850: Clients that receive a KoD now validate the origin timestamp field (bsc#952611).

CVE-2015-7849: Prevent use-after-free trusted key (bsc#952611).

CVE-2015-7848: Prevent mode 7 loop counter underrun (bsc#952611).

CVE-2015-7701: Slow memory leak in CRYPTO_ASSOC (bsc#952611).

CVE-2015-7703: Configuration directives 'pidfile' and 'driftfile' should only be allowed locally (bsc#943221).

CVE-2015-7704: Clients that receive a KoD should validate the origin timestamp field (bsc#952611).

CVE-2015-7705: Clients that receive a KoD should validate the origin timestamp field (bsc#952611).

CVE-2015-7691: Incomplete autokey data packet length checks (bsc#952611).

CVE-2015-7692: Incomplete autokey data packet length checks (bsc#952611).

CVE-2015-7702: Incomplete autokey data packet length checks (bsc#952611).

CVE-2015-1798: The symmetric-key feature in the receive function in ntp_proto.c in ntpd in NTP required a correct MAC only if the MAC field has a nonzero length, which made it easier for man-in-the-middle attackers to spoof packets by omitting the MAC (bsc#924202).

CVE-2015-1799: The symmetric-key feature in the receive function in ntp_proto.c in ntpd in NTP performed state-variable updates upon receiving certain invalid packets, which made it easier for man-in-the-middle attackers to cause a denial of service (synchronization loss) by spoofing the source IP address of a peer (bsc#924202).

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 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.

ntp was updated to version 4.2.8p6 to fix 12 security issues.

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).

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 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)

ID	Name	Product	Family	Published	Updated	Severity
88661	Amazon Linux AMI : ntp (ALAS-2016-649)	Nessus	Amazon Linux Local Security Checks	2/10/2016	6/22/2020	high
89577	Fedora 23 : ntp-4.2.6p5-36.fc23 (2016-8bb1932088)	Nessus	Fedora Local Security Checks	3/4/2016	1/11/2021	high
90820	SUSE SLES11 Security Update : ntp (SUSE-SU-2016:1175-1)	Nessus	SuSE Local Security Checks	5/2/2016	1/19/2021	high
92356	AIX NTP v3 Advisory : ntp_advisory6.asc (IV83984) (IV83993) (IV83994) (IV83995) (IV84269)	Nessus	AIX Local Security Checks	7/18/2016	1/30/2026	medium
106499	pfSense < 2.3 Multiple Vulnerabilities (SA-16_01 - SA-16_02)	Nessus	Firewalls	1/31/2018	10/30/2025	critical
88912	Slackware 13.0 / 13.1 / 13.37 / 14.0 / 14.1 / current : ntp (SSA:2016-054-04)	Nessus	Slackware Local Security Checks	2/24/2016	1/14/2021	high
93186	SUSE SLES10 Security Update : ntp (SUSE-SU-2016:1912-1)	Nessus	SuSE Local Security Checks	8/29/2016	1/27/2026	critical
94705	Oracle Linux 7 : ntp (ELSA-2016-2583)	Nessus	Oracle Linux Local Security Checks	11/11/2016	8/29/2025	high
90821	SUSE SLED12 / SLES12 Security Update : ntp (SUSE-SU-2016:1177-1)	Nessus	SuSE Local Security Checks	5/2/2016	1/6/2021	high
96052	F5 Networks BIG-IP : NTP vulnerability (K01324833)	Nessus	F5 Networks Local Security Checks	12/22/2016	10/21/2026	medium

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