CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:M/Au:N/C:N/I:N/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
Percentile
93.4%
An update for ntp is now available for Red Hat Enterprise Linux 6 and 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 when ntp is configured with rate limiting for all associations the limits are also applied to responses received from its configured sources. A remote attacker who knows the sources can cause a denial of service by preventing ntpd from accepting valid responses from its sources. (CVE-2016-7426)
A flaw was found in the control mode functionality of ntpd. A remote attacker could send a crafted control mode packet which could lead to information disclosure or result in DDoS amplification attacks.
(CVE-2016-9310)
A flaw was found in the way ntpd implemented the trap service. A remote attacker could send a specially crafted packet to cause a NULL pointer dereference that will crash ntpd, resulting in a denial of service. (CVE-2016-9311)
A flaw was found in the way ntpd running on a host with multiple network interfaces handled certain server responses. A remote attacker could use this flaw which would cause ntpd to not synchronize with the source. (CVE-2016-7429)
A flaw was found in the way ntpd calculated the root delay. A remote attacker could send a specially crafted spoofed packet to cause denial of service or in some special cases even crash. (CVE-2016-7433)
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2017:0252. The text
# itself is copyright (C) Red Hat, Inc.
#
include("compat.inc");
if (description)
{
script_id(97011);
script_version("3.15");
script_set_attribute(attribute:"plugin_modification_date", value:"2020/06/22");
script_cve_id("CVE-2016-7426", "CVE-2016-7429", "CVE-2016-7433", "CVE-2016-9310", "CVE-2016-9311");
script_xref(name:"RHSA", value:"2017:0252");
script_name(english:"RHEL 6 / 7 : ntp (RHSA-2017:0252)");
script_summary(english:"Checks the rpm output for the updated packages");
script_set_attribute(
attribute:"synopsis",
value:"The remote Red Hat host is missing one or more security updates."
);
script_set_attribute(
attribute:"description",
value:
"An update for ntp is now available for Red Hat Enterprise Linux 6 and
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 when ntp is configured with rate limiting for all
associations the limits are also applied to responses received from
its configured sources. A remote attacker who knows the sources can
cause a denial of service by preventing ntpd from accepting valid
responses from its sources. (CVE-2016-7426)
* A flaw was found in the control mode functionality of ntpd. A remote
attacker could send a crafted control mode packet which could lead to
information disclosure or result in DDoS amplification attacks.
(CVE-2016-9310)
* A flaw was found in the way ntpd implemented the trap service. A
remote attacker could send a specially crafted packet to cause a NULL
pointer dereference that will crash ntpd, resulting in a denial of
service. (CVE-2016-9311)
* A flaw was found in the way ntpd running on a host with multiple
network interfaces handled certain server responses. A remote attacker
could use this flaw which would cause ntpd to not synchronize with the
source. (CVE-2016-7429)
* A flaw was found in the way ntpd calculated the root delay. A remote
attacker could send a specially crafted spoofed packet to cause denial
of service or in some special cases even crash. (CVE-2016-7433)"
);
script_set_attribute(
attribute:"see_also",
value:"https://access.redhat.com/errata/RHSA-2017:0252"
);
script_set_attribute(
attribute:"see_also",
value:"https://access.redhat.com/security/cve/cve-2016-7426"
);
script_set_attribute(
attribute:"see_also",
value:"https://access.redhat.com/security/cve/cve-2016-7429"
);
script_set_attribute(
attribute:"see_also",
value:"https://access.redhat.com/security/cve/cve-2016-7433"
);
script_set_attribute(
attribute:"see_also",
value:"https://access.redhat.com/security/cve/cve-2016-9310"
);
script_set_attribute(
attribute:"see_also",
value:"https://access.redhat.com/security/cve/cve-2016-9311"
);
script_set_attribute(attribute:"solution", value:"Update the affected packages.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:C");
script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"exploit_available", value:"false");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ntp");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ntp-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ntp-doc");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ntp-perl");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ntpdate");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:sntp");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:6");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7.3");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7.4");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7.5");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7.6");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7.7");
script_set_attribute(attribute:"vuln_publication_date", value:"2017/01/13");
script_set_attribute(attribute:"patch_publication_date", value:"2017/02/06");
script_set_attribute(attribute:"plugin_publication_date", value:"2017/02/06");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2017-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_family(english:"Red Hat Local Security Checks");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/cpu");
exit(0);
}
include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");
include("rpm.inc");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/RedHat/release");
if (isnull(release) || "Red Hat" >!< release) audit(AUDIT_OS_NOT, "Red Hat");
os_ver = pregmatch(pattern: "Red Hat Enterprise Linux.*release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Red Hat");
os_ver = os_ver[1];
if (! preg(pattern:"^(6|7)([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Red Hat 6.x / 7.x", "Red Hat " + os_ver);
if (!get_kb_item("Host/RedHat/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$" && "s390" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Red Hat", cpu);
yum_updateinfo = get_kb_item("Host/RedHat/yum-updateinfo");
if (!empty_or_null(yum_updateinfo))
{
rhsa = "RHSA-2017:0252";
yum_report = redhat_generate_yum_updateinfo_report(rhsa:rhsa);
if (!empty_or_null(yum_report))
{
security_report_v4(
port : 0,
severity : SECURITY_HOLE,
extra : yum_report
);
exit(0);
}
else
{
audit_message = "affected by Red Hat security advisory " + rhsa;
audit(AUDIT_OS_NOT, audit_message);
}
}
else
{
flag = 0;
if (rpm_check(release:"RHEL6", cpu:"i686", reference:"ntp-4.2.6p5-10.el6_8.2")) flag++;
if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"ntp-4.2.6p5-10.el6_8.2")) flag++;
if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"ntp-4.2.6p5-10.el6_8.2")) flag++;
if (rpm_check(release:"RHEL6", cpu:"i686", reference:"ntp-debuginfo-4.2.6p5-10.el6_8.2")) flag++;
if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"ntp-debuginfo-4.2.6p5-10.el6_8.2")) flag++;
if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"ntp-debuginfo-4.2.6p5-10.el6_8.2")) flag++;
if (rpm_check(release:"RHEL6", reference:"ntp-doc-4.2.6p5-10.el6_8.2")) flag++;
if (rpm_check(release:"RHEL6", cpu:"i686", reference:"ntp-perl-4.2.6p5-10.el6_8.2")) flag++;
if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"ntp-perl-4.2.6p5-10.el6_8.2")) flag++;
if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"ntp-perl-4.2.6p5-10.el6_8.2")) flag++;
if (rpm_check(release:"RHEL6", cpu:"i686", reference:"ntpdate-4.2.6p5-10.el6_8.2")) flag++;
if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"ntpdate-4.2.6p5-10.el6_8.2")) flag++;
if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"ntpdate-4.2.6p5-10.el6_8.2")) flag++;
if (rpm_check(release:"RHEL7", cpu:"s390x", reference:"ntp-4.2.6p5-25.el7_3.1")) flag++;
if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"ntp-4.2.6p5-25.el7_3.1")) flag++;
if (rpm_check(release:"RHEL7", cpu:"s390x", reference:"ntp-debuginfo-4.2.6p5-25.el7_3.1")) flag++;
if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"ntp-debuginfo-4.2.6p5-25.el7_3.1")) flag++;
if (rpm_check(release:"RHEL7", reference:"ntp-doc-4.2.6p5-25.el7_3.1")) flag++;
if (rpm_check(release:"RHEL7", reference:"ntp-perl-4.2.6p5-25.el7_3.1")) flag++;
if (rpm_check(release:"RHEL7", cpu:"s390x", reference:"ntpdate-4.2.6p5-25.el7_3.1")) flag++;
if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"ntpdate-4.2.6p5-25.el7_3.1")) flag++;
if (rpm_check(release:"RHEL7", cpu:"s390x", reference:"sntp-4.2.6p5-25.el7_3.1")) flag++;
if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"sntp-4.2.6p5-25.el7_3.1")) flag++;
if (flag)
{
security_report_v4(
port : 0,
severity : SECURITY_HOLE,
extra : rpm_report_get() + redhat_report_package_caveat()
);
exit(0);
}
else
{
tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, "ntp / ntp-debuginfo / ntp-doc / ntp-perl / ntpdate / sntp");
}
}
Vendor | Product | Version | CPE |
---|---|---|---|
redhat | enterprise_linux | ntp | p-cpe:/a:redhat:enterprise_linux:ntp |
redhat | enterprise_linux | ntp-debuginfo | p-cpe:/a:redhat:enterprise_linux:ntp-debuginfo |
redhat | enterprise_linux | ntp-doc | p-cpe:/a:redhat:enterprise_linux:ntp-doc |
redhat | enterprise_linux | ntp-perl | p-cpe:/a:redhat:enterprise_linux:ntp-perl |
redhat | enterprise_linux | ntpdate | p-cpe:/a:redhat:enterprise_linux:ntpdate |
redhat | enterprise_linux | sntp | p-cpe:/a:redhat:enterprise_linux:sntp |
redhat | enterprise_linux | 6 | cpe:/o:redhat:enterprise_linux:6 |
redhat | enterprise_linux | 7 | cpe:/o:redhat:enterprise_linux:7 |
redhat | enterprise_linux | 7.3 | cpe:/o:redhat:enterprise_linux:7.3 |
redhat | enterprise_linux | 7.4 | cpe:/o:redhat:enterprise_linux:7.4 |
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-7426
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-7429
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-7433
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-9310
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-9311
access.redhat.com/errata/RHSA-2017:0252
access.redhat.com/security/cve/cve-2016-7426
access.redhat.com/security/cve/cve-2016-7429
access.redhat.com/security/cve/cve-2016-7433
access.redhat.com/security/cve/cve-2016-9310
access.redhat.com/security/cve/cve-2016-9311
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:M/Au:N/C:N/I:N/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
Percentile
93.4%