Updated ntp packages that fix multiple security issues, several bugs, and add two enhancements are now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

The Network Time Protocol (NTP) is used to synchronize a computer's time with another referenced time source.

It was found that because NTP's access control was based on a source IP address, an attacker could bypass source IP restrictions and send malicious control and configuration packets by spoofing ::1 addresses.
(CVE-2014-9298)

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)

A flaw was found in the way the ntp-keygen utility generated MD5 symmetric keys on big-endian systems. An attacker could possibly use this flaw to guess generated MD5 keys, which could then be used to spoof an NTP client or server. (CVE-2015-3405)

A stack-based buffer overflow was found in the way the NTP autokey protocol was implemented. When an NTP client decrypted a secret received from an NTP server, it could cause that client to crash.
(CVE-2014-9297)

It was found that ntpd did not check whether a Message Authentication Code (MAC) was present in a received packet when ntpd was configured to use symmetric cryptographic keys. A man-in-the-middle attacker could use this flaw to send crafted packets that would be accepted by a client or a peer without the attacker knowing the symmetric key.
(CVE-2015-1798)

The CVE-2015-1798 and CVE-2015-1799 issues were discovered by Miroslav Lichvar of Red Hat.

Bug fixes :

* The ntpd daemon truncated symmetric keys specified in the key file to 20 bytes. As a consequence, it was impossible to configure NTP authentication to work with peers that use longer keys. The maximum length of keys has now been changed to 32 bytes. (BZ#1053551)

* The ntp-keygen utility used the exponent of 3 when generating RSA keys, and generating RSA keys failed when FIPS mode was enabled.
ntp-keygen has been modified to use the exponent of 65537, and generating keys in FIPS mode now works as expected. (BZ#1184421)

* The ntpd daemon included a root delay when calculating its root dispersion. Consequently, the NTP server reported larger root dispersion than it should have and clients could reject the source when its distance reached the maximum synchronization distance (1.5 seconds by default). Calculation of root dispersion has been fixed, the root dispersion is now reported correctly, and clients no longer reject the server due to a large synchronization distance.
(BZ#1045376)

* The ntpd daemon dropped incoming NTP packets if their source port was lower than 123 (the NTP port). Clients behind Network Address Translation (NAT) were unable to synchronize with the server if their source port was translated to ports below 123. With this update, ntpd no longer checks the source port number. (BZ#1171630)

Enhancements :

* This update introduces configurable access of memory segments used for Shared Memory Driver (SHM) reference clocks. Previously, only the first two memory segments were created with owner-only access, allowing just two SHM reference clocks to be used securely on a system. Now, the owner-only access to SHM is configurable with the 'mode' option, and it is therefore possible to use more SHM reference clocks securely. (BZ#1122015)

* Support for nanosecond resolution has been added to the SHM reference clock. Prior to this update, when a Precision Time Protocol (PTP) hardware clock was used as a time source to synchronize the system clock (for example, with the timemaster service from the linuxptp package), the accuracy of the synchronization was limited due to the microsecond resolution of the SHM protocol. The nanosecond extension in the SHM protocol now enables sub-microsecond synchronization of the system clock. (BZ#1117704)

The vallen packet value is not validated in several code paths in ntp_crypto.c which can lead to information leakage or a possible crash of ntpd.

Security fix for CVE-2014-9297, CVE-2014-9298

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.

Updated ntp packages fix security vulnerabilities :

If no authentication key is defined in the ntp.conf file, a cryptographically-weak default key is generated (CVE-2014-9293).

ntp-keygen before 4.2.7p230 uses a non-cryptographic random number generator with a weak seed to generate symmetric keys (CVE-2014-9294).

A remote unauthenticated attacker may craft special packets that trigger buffer overflows in the ntpd functions crypto_recv() (when using autokey authentication), ctl_putdata(), and configure(). The resulting buffer overflows may be exploited to allow arbitrary malicious code to be executed with the privilege of the ntpd process (CVE-2014-9295).

A section of code in ntpd handling a rare error is missing a return statement, therefore processing did not stop when the error was encountered. This situation may be exploitable by an attacker (CVE-2014-9296).

Stephen Roettger of the Google Security Team, Sebastian Krahmer of the SUSE Security Team and Harlan Stenn of Network Time Foundation discovered that the length value in extension fields is not properly validated in several code paths in ntp_crypto.c, which could lead to information leakage or denial of service (CVE-2014-9297).

Stephen Roettger of the Google Security Team reported that ACLs based on IPv6 ::1 (localhost) addresses can be bypassed (CVE-2014-9298).

The ntp package has been patched to fix these issues.

s700_800 11.11 NTP timeservices upgrade plus utilities : 

Potential security vulnerabilities have been identified with HP-UX running NTP. These could be exploited remotely to execute code, create a Denial of Service (DoS), or other vulnerabilities. References:
CVE-2014-9293 - Insufficient Entropy in Pseudo-Random Number Generator (PRNG) (CWE-332) CVE-2014-9294 - Use of Cryptographically Weak PRNG (CWE-338) CVE-2014-9295 - Stack Buffer Overflow (CWE-121) CVE-2014-9296 - Error Conditions, Return Values, Status Codes (CWE-389) CVE-2014-9297 - Improper Check for Unusual or Exceptional Conditions (CWE-754) SSRT101872 VU#852879.

The remote NTP server is affected by an information disclosure vulnerability due to improper validation of the 'vallen' value in extension fields in 'ntp_crypto.c'. This allows a remote attacker to disclose sensitive information.

Note that this plugin requires both the scanner IP and target IP to not go through Network Address Translation (NAT) when communicating with each other.

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-9297 Network Time Protocol (NTP) Project NTP daemon (ntpd) could allow a remote attacker to conduct spoofing attacks, caused by insufficient entropy in PRNG. An attacker could exploit this vulnerability to spoof the IPv6 address ::1 to bypass ACLs and launch further attacks on the system. Network Time Protocol (NTP) Project NTP daemon (ntpd) is vulnerable to a denial of service, caused by an error when using symmetric key authentication. By sending specially-crafted packets to both peering hosts, an attacker could exploit this vulnerability to prevent synchronization.

xntp has been updated to fix two security issues :

  - CVE-2014-9298: ::1 can be spoofed on some OSes, so ACLs     based on IPv6 ::1 addresses can be bypassed     (bnc#911792).

  - CVE-2014-9297: vallen is not validated in several places     in ntp_crypto.c, leading to potential info leak     (bnc#911792).

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.

Updated ntp packages fix security vulnerabilities :

Stephen Roettger of the Google Security Team, Sebastian Krahmer of the SUSE Security Team and Harlan Stenn of Network Time Foundation discovered that the length value in extension fields is not properly validated in several code paths in ntp_crypto.c, which could lead to information leakage or denial of service (CVE-2014-9297).

Stephen Roettger of the Google Security Team reported that ACLs based on IPv6 ::1 (localhost) addresses can be bypassed (CVE-2014-9298).

Updated ntp packages that fix multiple security issues, several bugs, and add various enhancements are now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links 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.

It was found that because NTP's access control was based on a source IP address, an attacker could bypass source IP restrictions and send malicious control and configuration packets by spoofing ::1 addresses.
(CVE-2014-9298, CVE-2014-9751)

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)

A flaw was found in the way the ntp-keygen utility generated MD5 symmetric keys on big-endian systems. An attacker could possibly use this flaw to guess generated MD5 keys, which could then be used to spoof an NTP client or server. (CVE-2015-3405)

A stack-based buffer overflow was found in the way the NTP autokey protocol was implemented. When an NTP client decrypted a secret received from an NTP server, it could cause that client to crash.
(CVE-2014-9297, CVE-2014-9750)

It was found that ntpd did not check whether a Message Authentication Code (MAC) was present in a received packet when ntpd was configured to use symmetric cryptographic keys. A man-in-the-middle attacker could use this flaw to send crafted packets that would be accepted by a client or a peer without the attacker knowing the symmetric key.
(CVE-2015-1798)

The CVE-2015-1798 and CVE-2015-1799 issues were discovered by Miroslav Lichvar of Red Hat.

Bug fixes :

* The ntpd service truncated symmetric keys specified in the key file to 20 bytes. As a consequence, it was impossible to configure NTP authentication to work with peers that use longer keys. With this update, the maximum key length has been changed to 32 bytes.
(BZ#1191111)

* The ntpd service could previously join multicast groups only when starting, which caused problems if ntpd was started during system boot before network was configured. With this update, ntpd attempts to join multicast groups every time network configuration is changed.
(BZ#1207014)

* Previously, the ntp-keygen utility used the exponent of 3 when generating RSA keys. Consequently, generating RSA keys failed when FIPS mode was enabled. With this update, ntp-keygen has been modified to use the exponent of 65537, and generating keys in FIPS mode now works as expected. (BZ#1191116)

* The ntpd service dropped incoming NTP packets if their source port was lower than 123 (the NTP port). With this update, ntpd no longer checks the source port number, and clients behind NAT are now able to correctly synchronize with the server. (BZ#1171640)

Enhancements :

* This update adds support for configurable Differentiated Services Code Points (DSCP) in NTP packets, simplifying configuration in large networks where different NTP implementations or versions are using different DSCP values. (BZ#1202828)

* This update adds the ability to configure separate clock stepping thresholds for each direction (backward and forward). Use the 'stepback' and 'stepfwd' options to configure each threshold.
(BZ#1193154)

* Support for nanosecond resolution has been added to the Structural Health Monitoring (SHM) reference clock. Prior to this update, when a Precision Time Protocol (PTP) hardware clock was used as a time source to synchronize the system clock, the accuracy of the synchronization was limited due to the microsecond resolution of the SHM protocol. The nanosecond extension in the SHM protocol now allows sub-microsecond synchronization of the system clock. (BZ#1117702)

All ntp users are advised to upgrade to these updated packages, which contain backported patches to correct these issues and add these enhancements.

ntp has been updated to fix four security issues :

  - ntp-keygen used a weak RNG seed, which made it easier     for remote attackers to defeat cryptographic protection     mechanisms via a brute-force attack. (bsc#910764).
    (CVE-2014-9294)

  - The config_auth function, when an auth key is not     configured, improperly generated a key, which made it     easier for remote attackers to defeat cryptographic     protection mechanisms via a brute-force attack.
    (bsc#910764). (CVE-2014-9293)

  - ::1 can be spoofed on some operating systems, so ACLs     based on IPv6 ::1 addresses could be bypassed.
    (bsc#910764). (CVE-2014-9298)

  - vallen is not validated in several places in     ntp_crypto.c, leading to potential information leak.
    (bsc#910764). (CVE-2014-9297)

Several vulnerabilities were discovered in the ntp package, an implementation of the Network Time Protocol. The Common Vulnerabilities and Exposures project identifies the following problems :

CVE-2014-9297

Stephen Roettger of the Google Security Team, Sebastian Krahmer of the SUSE Security Team and Harlan Stenn of Network Time Foundation discovered that the length value in extension fields is not properly validated in several code paths in ntp_crypto.c, which could lead to information leakage or denial of service (ntpd crash).

CVE-2014-9298

Stephen Roettger of the Google Security Team reported that ACLs based on IPv6 ::1 addresses can be bypassed.

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.

The remote OracleVM system is missing necessary patches to address critical security updates :

  - reject packets without MAC when authentication is     enabled (CVE-2015-1798)

  - protect symmetric associations with symmetric key     against DoS attack (CVE-2015-1799)

  - fix generation of MD5 keys with ntp-keygen on big-endian     systems (CVE-2015-3405)

  - log when stepping clock for leap second or ignoring it     with -x (#1204625)

  - fix typos in ntpd man page (#1194463)

  - validate lengths of values in extension fields     (CVE-2014-9297)

  - drop packets with spoofed source address ::1     (CVE-2014-9298)

  - add nanosecond support to SHM refclock (#1117704)

  - allow creating all SHM segments with owner-only access     (#1122015)

  - allow symmetric keys up to 32 bytes again (#1053551)

  - fix calculation of root dispersion (#1045376)

  - fix crash in ntpq mreadvar command (#1165141)

  - don't step clock for leap second with -x option     (#1190619)

  - don't drop packets with source port below 123 (#1171630)

  - use larger RSA exponent in ntp-keygen (#1184421)

  - refresh peers on routing updates (#1193850)

  - increase memlock limit again (#1053568)

  - warn when monitor can't be disabled due to limited     restrict (#1166596)

  - improve documentation of restrict command (#1069019)

  - update logconfig documentation for patched default     (#1193849)

  - don't build ntpsnmpd (#995134)

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
85025	CentOS 6 : ntp (CESA-2015:1459)	Nessus	CentOS Local Security Checks	2015/7/28	2021/1/4	high
85949	F5 Networks BIG-IP : NTP vulnerability (SOL16392)	Nessus	F5 Networks Local Security Checks	2015/9/16	2021/3/10	medium
81361	Fedora 20 : ntp-4.2.6p5-20.fc20 (2015-1759)	Nessus	Fedora Local Security Checks	2015/2/16	2021/1/11	medium
82393	Mandriva Linux Security Advisory : ntp (MDVSA-2015:140)	Nessus	Mandriva Local Security Checks	2015/3/30	2021/1/14	high
82682	HP-UX PHNE_44235 : s700_800 11.11 NTP timeservices upgrade plus utilities	Nessus	HP-UX Local Security Checks	2015/4/10	2021/1/11	high
84288	Network Time Protocol Daemon (ntpd) Information Disclosure	Nessus	Misc.	2015/6/19	2025/9/29	medium
84493	AIX 7.1 TL 0 : ntp4 (IV71096)	Nessus	AIX Local Security Checks	2015/7/2	2023/4/21	medium
83685	SUSE SLES10 Security Update : xntp (SUSE-SU-2015:0322-1)	Nessus	SuSE Local Security Checks	2015/5/20	2021/1/6	high
81335	Mandriva Linux Security Advisory : ntp (MDVSA-2015:046)	Nessus	Mandriva Local Security Checks	2015/2/13	2021/1/6	high
84492	AIX 6.1 TL 6 : ntp4 (IV71094)	Nessus	AIX Local Security Checks	2015/7/2	2023/4/21	medium
87143	CentOS 7 : ntp (CESA-2015:2231)	Nessus	CentOS Local Security Checks	2015/12/2	2021/1/4	high
81313	SuSE 11.3 Security Update : ntp (SAT Patch Number 10293)	Nessus	SuSE Local Security Checks	2015/2/12	2021/1/6	high
82132	Debian DLA-149-1 : ntp security update	Nessus	Debian Local Security Checks	2015/3/26	2021/1/11	high
85143	OracleVM 3.3 : ntp (OVMSA-2015-0102)	Nessus	OracleVM Local Security Checks	2015/7/31	2021/1/4	high

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