CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:N/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
EPSS
Percentile
94.9%
The version of the remote NTP server is 3.x or 4.x prior to 4.2.8p6.
It is, therefore, 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 time serving flaw exists in the trusted key system due to improper key checks. An authenticated, remote attacker can exploit this to perform impersonation attacks between authenticated peers. (CVE-2015-7974)
An overflow condition exists in the nextvar() function due to improper validation of user-supplied input. A local attacker can exploit this to cause a buffer overflow, resulting in a denial of service condition.
(CVE-2015-7975)
A flaw exists in ntp_control.c due to improper filtering of special characters in filenames by the saveconfig command. An authenticated, remote attacker can exploit this to inject arbitrary content. (CVE-2015-7976)
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)
A flaw exists in ntpdc that is triggered during the handling of the relist command. A remote attacker can exploit this, via recursive traversals of the restriction list, to exhaust available space on the call stack, resulting in a denial of service condition.
CVE-2015-7978)
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 the receive() function that allows packets with an origin timestamp of zero to bypass security checks. A remote attacker can exploit this to spoof arbitrary content. (CVE-2015-8138)
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)
#
# (C) Tenable Network Security, Inc.
#
include("compat.inc");
if (description)
{
script_id(88054);
script_version("1.17");
script_cvs_date("Date: 2018/09/17 21:46:53");
script_cve_id(
"CVE-2015-7973",
"CVE-2015-7974",
"CVE-2015-7975",
"CVE-2015-7976",
"CVE-2015-7977",
"CVE-2015-7978",
"CVE-2015-7979",
"CVE-2015-8138",
"CVE-2015-8139",
"CVE-2015-8140",
"CVE-2015-8158"
);
script_bugtraq_id(
81963,
81811,
81814,
81815,
81816,
81959,
81960,
81962,
82102,
82105
);
script_xref(name:"CERT", value:"718152");
script_name(english:"Network Time Protocol Daemon (ntpd) 3.x / 4.x < 4.2.8p6 Multiple Vulnerabilities");
script_summary(english:"Checks for a vulnerable NTP server.");
script_set_attribute(attribute:"synopsis", value:
"The remote NTP server is affected by multiple vulnerabilities.");
script_set_attribute(attribute:"description", value:
"The version of the remote NTP server is 3.x or 4.x prior to 4.2.8p6.
It is, therefore, 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 time serving flaw exists in the trusted key system
due to improper key checks. An authenticated, remote
attacker can exploit this to perform impersonation
attacks between authenticated peers. (CVE-2015-7974)
- An overflow condition exists in the nextvar() function
due to improper validation of user-supplied input. A
local attacker can exploit this to cause a buffer
overflow, resulting in a denial of service condition.
(CVE-2015-7975)
- A flaw exists in ntp_control.c due to improper filtering
of special characters in filenames by the saveconfig
command. An authenticated, remote attacker can exploit
this to inject arbitrary content. (CVE-2015-7976)
- 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)
- A flaw exists in ntpdc that is triggered during the
handling of the relist command. A remote attacker can
exploit this, via recursive traversals of the
restriction list, to exhaust available space on the call
stack, resulting in a denial of service condition.
CVE-2015-7978)
- 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 the receive() function that allows
packets with an origin timestamp of zero to bypass
security checks. A remote attacker can exploit this to
spoof arbitrary content. (CVE-2015-8138)
- 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)");
script_set_attribute(attribute:"see_also", value:"http://support.ntp.org/bin/view/Main/SecurityNotice");
# http://support.ntp.org/bin/view/Main/SecurityNotice#January_2016_NTP_4_2_8p6_Securit
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?d42322ca");
script_set_attribute(attribute:"solution", value:
"Upgrade to NTP version 4.2.8p6 or later.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:P");
script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L");
script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2015-8140");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"exploit_available", value:"false");
script_set_attribute(attribute:"vuln_publication_date", value:"2016/01/19");
script_set_attribute(attribute:"patch_publication_date", value:"2016/01/19");
script_set_attribute(attribute:"plugin_publication_date", value:"2016/01/21");
script_set_attribute(attribute:"plugin_type", value:"remote");
script_set_attribute(attribute:"cpe", value:"cpe:/a:ntp:ntp");
script_set_attribute(attribute:"potential_vulnerability", value:"true");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Misc.");
script_copyright(english:"This script is Copyright (C) 2016-2018 Tenable Network Security, Inc.");
script_dependencies("ntp_open.nasl");
script_require_keys("NTP/Running", "Settings/ParanoidReport");
exit(0);
}
include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");
# Make sure NTP server is running
get_kb_item_or_exit('NTP/Running');
app_name = "NTP Server";
port = get_kb_item("Services/udp/ntp");
if (!port) port = 123;
version = get_kb_item_or_exit("Services/ntp/version");
if (version == 'unknown') audit(AUDIT_UNKNOWN_APP_VER, app_name);
match = eregmatch(string:version, pattern:"([0-9a-z.]+)");
if (isnull(match) || empty_or_null(match[1])) exit(AUDIT_UNKNOWN_APP_VER, app_name);
# Paranoia check
if (report_paranoia < 2) audit(AUDIT_PARANOID);
ver = match[1];
verfields = split(ver, sep:".", keep:FALSE);
major = int(verfields[0]);
minor = int(verfields[1]);
if ('p' >< verfields[2])
{
revpatch = split(verfields[2], sep:"p", keep:FALSE);
rev = int(revpatch[0]);
patch = int(revpatch[1]);
}
else
{
rev = verfields[2];
patch = 0;
}
# This vulnerability affects NTP 3.x / 4.x < 4.2.8p6
if (
(major == 3) ||
(major == 4 && minor < 2) ||
(major == 4 && minor == 2 && rev < 8) ||
(major == 4 && minor == 2 && rev == 8 && patch < 6)
)
{
fix = "4.2.8p6";
}
else audit(AUDIT_INST_VER_NOT_VULN, app_name, version);
report =
'\n Installed version : ' + version +
'\n Fixed version : ' + fix +
'\n';
security_report_v4(
port : port,
proto : "udp",
extra : report,
severity : SECURITY_WARNING
);
exit(0);
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7973
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7974
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7975
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7976
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7977
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7978
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7979
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-8138
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-8139
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-8140
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-8158
support.ntp.org/bin/view/Main/SecurityNotice
www.nessus.org/u?d42322ca
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:N/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
EPSS
Percentile
94.9%