Scientific Linux Security Update : ntp on SL6.x i386/x86_64 (20150722)

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text is (C) Scientific Linux.
#

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(85203);
  script_version("2.10");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/14");

  script_cve_id("CVE-2014-9297", "CVE-2014-9298", "CVE-2015-1798", "CVE-2015-1799", "CVE-2015-3405");

  script_name(english:"Scientific Linux Security Update : ntp on SL6.x i386/x86_64 (20150722)");
  script_summary(english:"Checks rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:
"The remote Scientific Linux host is missing one or more security
updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"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
Lichvr 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.

  - 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.

  - 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.

  - 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.

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.

  - 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."
  );
  # https://listserv.fnal.gov/scripts/wa.exe?A2=ind1508&L=scientific-linux-errata&F=&S=&P=3154
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?0b44f175"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:ntp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:ntp-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:ntp-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:ntp-perl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:ntpdate");
  script_set_attribute(attribute:"cpe", value:"x-cpe:/o:fermilab:scientific_linux");

  script_set_attribute(attribute:"vuln_publication_date", value:"2015/04/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2015/07/22");
  script_set_attribute(attribute:"plugin_publication_date", value:"2015/08/04");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2015-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Scientific Linux Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/cpu", "Host/RedHat/release", "Host/RedHat/rpm-list");

  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) || "Scientific Linux " >!< release) audit(AUDIT_HOST_NOT, "running Scientific Linux");
os_ver = pregmatch(pattern: "Scientific Linux.*release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Scientific Linux");
os_ver = os_ver[1];
if (! preg(pattern:"^6([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Scientific Linux 6.x", "Scientific Linux " + 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 (cpu >!< "x86_64" && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Scientific Linux", cpu);


flag = 0;
if (rpm_check(release:"SL6", reference:"ntp-4.2.6p5-5.el6")) flag++;
if (rpm_check(release:"SL6", reference:"ntp-debuginfo-4.2.6p5-5.el6")) flag++;
if (rpm_check(release:"SL6", reference:"ntp-doc-4.2.6p5-5.el6")) flag++;
if (rpm_check(release:"SL6", reference:"ntp-perl-4.2.6p5-5.el6")) flag++;
if (rpm_check(release:"SL6", reference:"ntpdate-4.2.6p5-5.el6")) flag++;


if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : rpm_report_get()
  );
  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");
}