The remote MiracleLinux 7 host has a package installed that is affected by multiple vulnerabilities as referenced in the AXSA:2015-927:01 advisory.

    A client/server for the Network Time Protocol, this program keeps your     computer's clock accurate. It was specially designed to support     systems with intermittent internet connections, but it also works well     in permanently connected environments. It can use also hardware reference     clocks, system real-time clock or manual input as time references.
    Security issues fixed with this release:
    CVE-2015-1821     Heap-based buffer overflow in chrony before 1.31.1 allows remote     authenticated users to cause a denial of service (chronyd crash) or     possibly execute arbitrary code by configuring the (1) NTP or (2)     cmdmon access with a subnet size that is indivisible by four and an     address with a nonzero bit in the subnet remainder.
    CVE-2015-1822     chrony before 1.31.1 does not initialize the last next pointer when     saving unacknowledged replies to command requests, which allows remote     authenticated users to cause a denial of service (uninitialized     pointer dereference and daemon crash) or possibly execute arbitrary     code via a large number of command requests.
    CVE-2015-1853
    ** RESERVED **     This candidate has been reserved by an organization or individual that     will use it when announcing a new security problem.  When the     candidate has been publicized, the details for this candidate will be     provided.
    Fixed bugs:
    * Updated to NTP version 4 (RFC 5905)
    * Added pool directive to specify pool of NTP servers
    * Added leapsecmode directive to select how to correct clock for leap second
    * Added smoothtime directive to smooth served time and enable leap smear
    * Added asynchronous name resolving with POSIX threads
    * Ready for year 2036 (next NTP era)
    * Improved clock control
    * Networking code reworked to open separate client sockets for each NTP server     Fixed bugs:
    * The chronyd service previously assumed that network interfaces specified with the bindaddress     directive were ready when the service was started. This could cause chronyd to fail to bind an NTP server     socket to the interface if the interface was not ready. With this update, chronyd uses the IP_FREEBIND     socket option, enabling it to bind to an interface later, not only when the service starts.
    Enhancements:
    * The chronyd service now supports four modes of handling leap seconds, configured using the leapsecmode     option. The clock can be either stepped by the kernel (the default system mode), stepped by chronyd     (step mode), slowly adjusted by slewing (slew mode), or the leap second can be ignored and corrected     later in normal operation (ignore mode). If you select slewing, the correction will always start at     00:00:00 UTC and will be applied at a rate specified in the maxslewrate option.

Tenable has extracted the preceding description block directly from the MiracleLinux 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 NewStart CGSL host, running version MAIN 6.06 (SP), has chrony packages installed that are affected by multiple vulnerabilities:

  - chrony before 1.31.2 and 2.x before 2.2.1 do not verify peer associations of symmetric keys when     authenticating packets, which might allow remote attackers to conduct impersonation attacks via an     arbitrary trusted key, aka a skeleton key. (CVE-2016-1567)

  - The read_from_cmd_socket function in cmdmon.c in chronyd in Chrony before 1.23.1, and 1.24-pre1, allows     remote attackers to cause a denial of service (CPU and bandwidth consumption) by sending a spoofed cmdmon     packet that triggers a continuous exchange of NOHOSTACCESS messages between two daemons, a related issue     to CVE-2009-3563. (CVE-2010-0292)

  - The client logging functionality in chronyd in Chrony before 1.23.1 does not restrict the amount of memory     used for storage of client information, which allows remote attackers to cause a denial of service (memory     consumption) via spoofed (1) NTP or (2) cmdmon packets. (CVE-2010-0293)

  - chronyd in Chrony before 1.23.1, and possibly 1.24-pre1, generates a syslog message for each unauthorized     cmdmon packet, which allows remote attackers to cause a denial of service (disk consumption) via a large     number of invalid packets. (CVE-2010-0294)

  - Multiple integer overflows in pktlength.c in Chrony before 1.29 allow remote attackers to cause a denial     of service (crash) via a crafted (1) REQ_SUBNETS_ACCESSED or (2) REQ_CLIENT_ACCESSES command request to     the PKL_CommandLength function or crafted (3) RPY_SUBNETS_ACCESSED, (4) RPY_CLIENT_ACCESSES, (5)     RPY_CLIENT_ACCESSES_BY_INDEX, or (6) RPY_MANUAL_LIST command reply to the PKL_ReplyLength function, which     triggers an out-of-bounds read or buffer overflow. NOTE: versions 1.27 and 1.28 do not require     authentication to exploit. (CVE-2012-4502)

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

Security fix for CVE-2015-1853, CVE-2015-1821, CVE-2015-1822

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 chrony packages that fix three 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 chrony suite, chronyd and chronyc, is an advanced implementation of the Network Time Protocol (NTP), specially designed to support systems with intermittent connections. It can synchronize the system clock with NTP servers, hardware reference clocks, and manual input.
It can also operate as an NTPv4 (RFC 5905) server or peer to provide a time service to other computers in the network.

An out-of-bounds write flaw was found in the way chrony stored certain addresses when configuring NTP or cmdmon access. An attacker that has the command key and is allowed to access cmdmon (only localhost is allowed by default) could use this flaw to crash chronyd or, possibly, execute arbitrary code with the privileges of the chronyd process.
(CVE-2015-1821)

An uninitialized pointer use flaw was found when allocating memory to save unacknowledged replies to authenticated command requests. An attacker that has the command key and is allowed to access cmdmon (only localhost is allowed by default) could use this flaw to crash chronyd or, possibly, execute arbitrary code with the privileges of the chronyd process. (CVE-2015-1822)

A denial of service flaw was found in the way chrony 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-2015-1853)

These issues were discovered by Miroslav Lichvar of Red Hat.

The chrony packages have been upgraded to upstream version 2.1.1, which provides a number of bug fixes and enhancements over the previous version. Notable enhancements include :

* Updated to NTP version 4 (RFC 5905)

* Added pool directive to specify pool of NTP servers

* Added leapsecmode directive to select how to correct clock for leap second

* Added smoothtime directive to smooth served time and enable leap smear

* Added asynchronous name resolving with POSIX threads

* Ready for year 2036 (next NTP era)

* Improved clock control

* Networking code reworked to open separate client sockets for each NTP server

(BZ#1117882)

This update also fixes the following bug :

* The chronyd service previously assumed that network interfaces specified with the 'bindaddress' directive were ready when the service was started. This could cause chronyd to fail to bind an NTP server socket to the interface if the interface was not ready. With this update, chronyd uses the IP_FREEBIND socket option, enabling it to bind to an interface later, not only when the service starts.
(BZ#1169353)

In addition, this update adds the following enhancement :

* The chronyd service now supports four modes of handling leap seconds, configured using the 'leapsecmode' option. The clock can be either stepped by the kernel (the default 'system' mode), stepped by chronyd ('step' mode), slowly adjusted by slewing ('slew' mode), or the leap second can be ignored and corrected later in normal operation ('ignore' mode). If you select slewing, the correction will always start at 00:00:00 UTC and will be applied at a rate specified in the 'maxslewrate' option. (BZ#1206504)

All chrony users are advised to upgrade to these updated packages, which correct these issues and add these enhancements.

The remote host is affected by the vulnerability described in GLSA-201507-01 (chrony: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in chrony. Please review       the CVE identifiers referenced below for details.
  Impact :

    A remote attacker can cause arbitrary remote code execution or Denial of       service condition.
  Workaround :

    There is no known workaround at this time.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
289344	MiracleLinux 7 : chrony-2.1.1-1.0.1.el7.AXS7 (AXSA:2015-927:01)	Nessus	Miracle Linux Local Security Checks	2026/1/16	2026/1/16	medium
301211	NewStart CGSL MAIN 6.06 (SP) : chrony Multiple Vulnerabilities (NS-SA-2026-0009)	Nessus	NewStart CGSL Local Security Checks	2026/3/6	2026/3/6	high
83007	Fedora 22 : chrony-2.0-0.3.pre2.fc22 (2015-5748)	Nessus	Fedora Local Security Checks	2015/4/23	2021/1/11	medium
86978	RHEL 7 : chrony (RHSA-2015:2241)	Nessus	Red Hat Local Security Checks	2015/11/20	2019/12/18	medium
87146	CentOS 7 : chrony (CESA-2015:2241)	Nessus	CentOS Local Security Checks	2015/12/2	2021/1/4	medium
83009	Fedora 21 : chrony-1.31.1-1.fc21 (2015-5816)	Nessus	Fedora Local Security Checks	2015/4/23	2021/1/11	medium
84531	GLSA-201507-01 : chrony: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	2015/7/6	2021/1/11	medium

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