SUSE SLES12 Security Update : ntp (SUSE-SU-2020:1805-1)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from SUSE update advisory SUSE-SU-2020:1805-1.
# The text itself is copyright (C) SUSE.
#

include("compat.inc");

if (description)
{
  script_id(138311);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/13");

  script_cve_id("CVE-2018-8956", "CVE-2020-11868", "CVE-2020-13817", "CVE-2020-15025");
  script_xref(name:"IAVA", value:"2020-A-0289");

  script_name(english:"SUSE SLES12 Security Update : ntp (SUSE-SU-2020:1805-1)");
  script_summary(english:"Checks rpm output for the updated packages.");

  script_set_attribute(
    attribute:"synopsis",
    value:"The remote SUSE host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description",
    value:
"This update for ntp fixes the following issues :

ntp was updated to 4.2.8p15

CVE-2020-11868: Fixed an issue which a server mode packet with spoofed
source address frequently send to the client ntpd could have caused
denial of service (bsc#1169740).

CVE-2018-8956: Fixed an issue which could have allowed remote
attackers to prevent a broadcast client from synchronizing its clock
with a broadcast NTP server via spoofed mode 3 and mode 5 packets
(bsc#1171355).

CVE-2020-13817: Fixed an issue which an off-path attacker with the
ability to query time from victim's ntpd instance could have modified
the victim's clock by a limited amount (bsc#1172651).

CVE-2020-15025: Fixed an issue which remote attacker could have caused
denial of service by consuming the memory when a CMAC key was used
andassociated with a CMAC algorithm in the ntp.keys (bsc#1173334).

Note that Tenable Network Security has extracted the preceding
description block directly from the SUSE security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1169740"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1171355"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1172651"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1173334"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2018-8956/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2020-11868/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2020-13817/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2020-15025/"
  );
  # https://www.suse.com/support/update/announcement/2020/suse-su-20201805-1
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?dcad22c7"
  );
  script_set_attribute(
    attribute:"solution",
    value:
"To install this SUSE Security Update use the SUSE recommended
installation methods like YaST online_update or 'zypper patch'.

Alternatively you can run the command listed for your product :

SUSE OpenStack Cloud Crowbar 8 :

zypper in -t patch SUSE-OpenStack-Cloud-Crowbar-8-2020-1805=1

SUSE OpenStack Cloud 8 :

zypper in -t patch SUSE-OpenStack-Cloud-8-2020-1805=1

SUSE OpenStack Cloud 7 :

zypper in -t patch SUSE-OpenStack-Cloud-7-2020-1805=1

SUSE Linux Enterprise Server for SAP 12-SP3 :

zypper in -t patch SUSE-SLE-SAP-12-SP3-2020-1805=1

SUSE Linux Enterprise Server for SAP 12-SP2 :

zypper in -t patch SUSE-SLE-SAP-12-SP2-2020-1805=1

SUSE Linux Enterprise Server 12-SP5 :

zypper in -t patch SUSE-SLE-SERVER-12-SP5-2020-1805=1

SUSE Linux Enterprise Server 12-SP4 :

zypper in -t patch SUSE-SLE-SERVER-12-SP4-2020-1805=1

SUSE Linux Enterprise Server 12-SP3-LTSS :

zypper in -t patch SUSE-SLE-SERVER-12-SP3-2020-1805=1

SUSE Linux Enterprise Server 12-SP3-BCL :

zypper in -t patch SUSE-SLE-SERVER-12-SP3-BCL-2020-1805=1

SUSE Linux Enterprise Server 12-SP2-LTSS :

zypper in -t patch SUSE-SLE-SERVER-12-SP2-2020-1805=1

SUSE Linux Enterprise Server 12-SP2-BCL :

zypper in -t patch SUSE-SLE-SERVER-12-SP2-BCL-2020-1805=1

SUSE Enterprise Storage 5 :

zypper in -t patch SUSE-Storage-5-2020-1805=1

HPE Helion Openstack 8 :

zypper in -t patch HPE-Helion-OpenStack-8-2020-1805=1"
  );
  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:H/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-2020-13817");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:ntp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:ntp-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:ntp-debugsource");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:ntp-doc");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:suse_linux:12");

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/04/17");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/06/30");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/07/09");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2020-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"SuSE Local Security Checks");

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

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("rpm.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/SuSE/release");
if (isnull(release) || release !~ "^(SLED|SLES)") audit(AUDIT_OS_NOT, "SUSE");
os_ver = pregmatch(pattern: "^(SLE(S|D)\d+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "SUSE");
os_ver = os_ver[1];
if (! preg(pattern:"^(SLES12)$", string:os_ver)) audit(AUDIT_OS_NOT, "SUSE SLES12", "SUSE " + os_ver);

if (!get_kb_item("Host/SuSE/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if (cpu !~ "^i[3-6]86$" && "x86_64" >!< cpu && "s390x" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "SUSE " + os_ver, cpu);

sp = get_kb_item("Host/SuSE/patchlevel");
if (isnull(sp)) sp = "0";
if (os_ver == "SLES12" && (! preg(pattern:"^(2|3|4|5)$", string:sp))) audit(AUDIT_OS_NOT, "SLES12 SP2/3/4/5", os_ver + " SP" + sp);


flag = 0;
if (rpm_check(release:"SLES12", sp:"4", reference:"ntp-4.2.8p15-88.1")) flag++;
if (rpm_check(release:"SLES12", sp:"4", reference:"ntp-debuginfo-4.2.8p15-88.1")) flag++;
if (rpm_check(release:"SLES12", sp:"4", reference:"ntp-debugsource-4.2.8p15-88.1")) flag++;
if (rpm_check(release:"SLES12", sp:"4", reference:"ntp-doc-4.2.8p15-88.1")) flag++;
if (rpm_check(release:"SLES12", sp:"3", reference:"ntp-4.2.8p15-88.1")) flag++;
if (rpm_check(release:"SLES12", sp:"3", reference:"ntp-debuginfo-4.2.8p15-88.1")) flag++;
if (rpm_check(release:"SLES12", sp:"3", reference:"ntp-debugsource-4.2.8p15-88.1")) flag++;
if (rpm_check(release:"SLES12", sp:"3", reference:"ntp-doc-4.2.8p15-88.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", reference:"ntp-4.2.8p15-88.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", reference:"ntp-debuginfo-4.2.8p15-88.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", reference:"ntp-debugsource-4.2.8p15-88.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", reference:"ntp-doc-4.2.8p15-88.1")) flag++;
if (rpm_check(release:"SLES12", sp:"5", reference:"ntp-4.2.8p15-88.1")) flag++;
if (rpm_check(release:"SLES12", sp:"5", reference:"ntp-debuginfo-4.2.8p15-88.1")) flag++;
if (rpm_check(release:"SLES12", sp:"5", reference:"ntp-debugsource-4.2.8p15-88.1")) flag++;
if (rpm_check(release:"SLES12", sp:"5", reference:"ntp-doc-4.2.8p15-88.1")) flag++;


if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:rpm_report_get());
  else security_warning(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "ntp");
}