The version of the remote NTP server is 3.x or 4.x prior to 4.2.8p3.
It is, therefore, affected by the following vulnerability :
#
# (C) Tenable Network Security, Inc.
#
include("compat.inc");
if (description)
{
script_id(121310);
script_version("1.2");
script_cvs_date("Date: 2019/10/31 15:18:51");
script_cve_id("CVE-2015-5146");
script_name(english:"Network Time Protocol Daemon (ntpd) 3.x / 4.x < 4.2.8p3 Denial Of Service Vulnerability");
script_summary(english:"Checks for a vulnerable NTP server.");
script_set_attribute(attribute:"synopsis", value:
"The remote NTP server is affected by a denial of service vulnerability.");
script_set_attribute(attribute:"description", value:
"The version of the remote NTP server is 3.x or 4.x prior to 4.2.8p3.
It is, therefore, affected by the following vulnerability :
- ntpd in ntp before 4.2.8p3 with remote configuration enabled
allows remote authenticated users with knowledge of the
configuration password and access to a computer entrusted to
perform remote configuration to cause a denial of service
(service crash) via a NULL byte in a crafted configuration
directive packet. (CVE-2015-1798)");
script_set_attribute(attribute:"see_also", value:"http://support.ntp.org/bin/view/Main/SecurityNotice");
script_set_attribute(attribute:"see_also", value:"http://bugs.ntp.org/show_bug.cgi?id=2853");
script_set_attribute(attribute:"solution", value:
"Upgrade to NTP version 4.2.8p3 or later.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:S/C:N/I:N/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:L/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:"cvss_score_source", value:"CVE-2015-5146");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"vuln_publication_date", value:"2015/06/16");
script_set_attribute(attribute:"patch_publication_date", value:"2015/06/29");
script_set_attribute(attribute:"plugin_publication_date", value:"2019/01/22");
script_set_attribute(attribute:"potential_vulnerability", value:"true");
script_set_attribute(attribute:"plugin_type", value:"remote");
script_set_attribute(attribute:"cpe", value:"cpe:/a:ntp:ntp");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Misc.");
script_copyright(english:"This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
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 = pregmatch(string:version, pattern:"([0-9a-z.]+)");
if (isnull(match) || empty_or_null(match[1])) audit(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 < 4.2.8p2
if (
(major < 4 && major >= 3) ||
(major == 4 && minor < 2) ||
(major == 4 && minor == 2 && rev < 8) ||
(major == 4 && minor == 2 && rev == 8 && patch < 3)
)
{
fix = "4.2.8p3";
}
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_NOTE
);
exit(0);