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.

This update for ntp fixes the following issues :

  - Simplify ntpd's search for its own executable to prevent     AppArmor warnings (bsc#956365). Security issues fixed     (update to 4.2.8p9) :

  - CVE-2016-9311, CVE-2016-9310, bsc#1011377: Mode 6     unauthenticated trap information disclosure and DDoS     vector.

  - CVE-2016-7427, bsc#1011390: Broadcast Mode Replay     Prevention DoS.

  - CVE-2016-7428, bsc#1011417: Broadcast Mode Poll Interval     Enforcement DoS.

  - CVE-2016-7431, bsc#1011395: Regression: 010-origin: Zero     Origin Timestamp Bypass.

  - CVE-2016-7434, bsc#1011398: NULL pointer dereference in
    _IO_str_init_static_internal().

  - CVE-2016-7429, bsc#1011404: Interface selection attack.

  - CVE-2016-7426, bsc#1011406: Client rate limiting and     server responses.

  - CVE-2016-7433, bsc#1011411: Reboot sync calculation     problem.

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

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

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

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

  - Fix a spurious error message.

  - Other bugfixes, see     /usr/share/doc/packages/ntp/ChangeLog.

  - Fix a regression in 'trap' (bsc#981252).

  - Reduce the number of netlink groups to listen on for     changes to the local network setup (bsc#992606).

  - Fix segfault in 'sntp -a' (bsc#1009434).

  - Silence an OpenSSL version warning (bsc#992038).

  - Make the resolver task change user and group IDs to the     same values as the main task. (bsc#988028)

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 update for ntp fixes the following issues: ntp was updated to 4.2.8p9. Security issues fixed :

  - CVE-2016-9311, CVE-2016-9310, bsc#1011377: Mode 6     unauthenticated trap information disclosure and DDoS     vector.

  - CVE-2016-7427, bsc#1011390: Broadcast Mode Replay     Prevention DoS.

  - CVE-2016-7428, bsc#1011417: Broadcast Mode Poll Interval     Enforcement DoS.

  - CVE-2016-7431, bsc#1011395: Regression: 010-origin: Zero     Origin Timestamp Bypass.

  - CVE-2016-7434, bsc#1011398: NULL pointer dereference in
    _IO_str_init_static_internal().

  - CVE-2016-7429, bsc#1011404: Interface selection attack.

  - CVE-2016-7426, bsc#1011406: Client rate limiting and     server responses.

  - CVE-2016-7433, bsc#1011411: Reboot sync calculation     problem.

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

  - Fix a spurious error message.

  - Other bugfixes, see     /usr/share/doc/packages/ntp/ChangeLog.

  - Fix a regression in 'trap' (bsc#981252).

  - Reduce the number of netlink groups to listen on for     changes to the local network setup (bsc#992606).

  - Fix segfault in 'sntp -a' (bsc#1009434).

  - Silence an OpenSSL version warning (bsc#992038).

  - Make the resolver task change user and group IDs to the     same values as the main task. (bsc#988028)

  - Simplify ntpd's search for its own executable to prevent     AppArmor warnings (bsc#956365).

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 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)

ID	名稱	產品	系列	已發布	已更新	嚴重性
95330	CentOS 7 : ntp (CESA-2016:2583)	Nessus	CentOS Local Security Checks	2016/11/28	2026/1/16	high
95986	SUSE SLES11 Security Update : ntp (SUSE-SU-2016:3193-1)	Nessus	SuSE Local Security Checks	2016/12/21	2026/1/7	medium
95988	SUSE SLES12 Security Update : ntp (SUSE-SU-2016:3196-1)	Nessus	SuSE Local Security Checks	2016/12/21	2026/1/7	medium
102322	AIX NTP v4 Advisory : ntp_advisory4.asc (IV79954) (IV79954)	Nessus	AIX Local Security Checks	2017/8/9	2025/12/2	critical

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