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nessusThis script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.ALA_ALAS-2020-1430.NASL
HistorySep 04, 2020 - 12:00 a.m.

Amazon Linux AMI : kernel (ALAS-2020-1430)

2020-09-0400:00:00
This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.
www.tenable.com
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The version of tested product installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the ALAS-2020-1430 advisory.

  • An issue has been reported in the Linux kernel’s handling of raw sockets. This issue can be used locally to cause denial of service or local privilege escalation from unprivileged processes or from containers with the CAP_NET_RAW capability enabled. (CVE-2020-14386)

Note that Nessus has not tested for this issue but has instead relied only on the application’s self-reported version number.

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux AMI Security Advisory ALAS-2020-1430.
#

include('compat.inc');

if (description)
{
  script_id(140210);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/09/28");

  script_cve_id("CVE-2020-14386");
  script_xref(name:"ALAS", value:"2020-1430");

  script_name(english:"Amazon Linux AMI : kernel (ALAS-2020-1430)");
  script_summary(english:"Checks rpm output for the updated packages");

  script_set_attribute(attribute:"synopsis", value:
"The remote Amazon Linux AMI host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"The version of tested product installed on the remote host is prior to tested version. It is, therefore, affected by a
vulnerability as referenced in the ALAS-2020-1430 advisory.

  - An issue has been reported in the Linux kernel's handling of raw sockets. This issue can be used locally
    to cause denial of service or local privilege escalation from unprivileged processes or from containers
    with the CAP_NET_RAW capability enabled. (CVE-2020-14386)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/ALAS-2020-1430.html");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2020-14386");
  script_set_attribute(attribute:"solution", value:
"Run 'yum update kernel' to update your system.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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-2020-14386");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/09/03");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/09/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/09/04");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-debuginfo-common-i686");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-debuginfo-common-x86_64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-headers");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-tools-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-tools-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:perf");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:perf-debuginfo");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Amazon Linux Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  exit(0);
}

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

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);

release = get_kb_item("Host/AmazonLinux/release");
if (isnull(release) || !strlen(release)) audit(AUDIT_OS_NOT, "Amazon Linux");
os_ver = pregmatch(pattern: "^AL(A|\d)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Amazon Linux");
os_ver = os_ver[1];
if (os_ver != "A")
{
  if (os_ver == 'A') os_ver = 'AMI';
  audit(AUDIT_OS_NOT, "Amazon Linux AMI", "Amazon Linux " + os_ver);
}

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

if (get_one_kb_item("Host/kpatch/kernel-cves"))
{
  set_hotfix_type("kpatch");
  cve_list = make_list("CVE-2020-14386");
  if (hotfix_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, "kpatch hotfix for ALAS-2020-1430");
  }
  else
  {
    __rpm_report = hotfix_reporting_text();
  }
}
pkgs = [
    {'reference':'kernel-4.14.193-113.317.amzn1', 'cpu':'i686', 'release':'ALA'},
    {'reference':'kernel-4.14.193-113.317.amzn1', 'cpu':'x86_64', 'release':'ALA'},
    {'reference':'kernel-debuginfo-4.14.193-113.317.amzn1', 'cpu':'i686', 'release':'ALA'},
    {'reference':'kernel-debuginfo-4.14.193-113.317.amzn1', 'cpu':'x86_64', 'release':'ALA'},
    {'reference':'kernel-debuginfo-common-i686-4.14.193-113.317.amzn1', 'cpu':'i686', 'release':'ALA'},
    {'reference':'kernel-debuginfo-common-x86_64-4.14.193-113.317.amzn1', 'cpu':'x86_64', 'release':'ALA'},
    {'reference':'kernel-devel-4.14.193-113.317.amzn1', 'cpu':'i686', 'release':'ALA'},
    {'reference':'kernel-devel-4.14.193-113.317.amzn1', 'cpu':'x86_64', 'release':'ALA'},
    {'reference':'kernel-headers-4.14.193-113.317.amzn1', 'cpu':'i686', 'release':'ALA'},
    {'reference':'kernel-headers-4.14.193-113.317.amzn1', 'cpu':'x86_64', 'release':'ALA'},
    {'reference':'kernel-tools-4.14.193-113.317.amzn1', 'cpu':'i686', 'release':'ALA'},
    {'reference':'kernel-tools-4.14.193-113.317.amzn1', 'cpu':'x86_64', 'release':'ALA'},
    {'reference':'kernel-tools-debuginfo-4.14.193-113.317.amzn1', 'cpu':'i686', 'release':'ALA'},
    {'reference':'kernel-tools-debuginfo-4.14.193-113.317.amzn1', 'cpu':'x86_64', 'release':'ALA'},
    {'reference':'kernel-tools-devel-4.14.193-113.317.amzn1', 'cpu':'i686', 'release':'ALA'},
    {'reference':'kernel-tools-devel-4.14.193-113.317.amzn1', 'cpu':'x86_64', 'release':'ALA'},
    {'reference':'perf-4.14.193-113.317.amzn1', 'cpu':'i686', 'release':'ALA'},
    {'reference':'perf-4.14.193-113.317.amzn1', 'cpu':'x86_64', 'release':'ALA'},
    {'reference':'perf-debuginfo-4.14.193-113.317.amzn1', 'cpu':'i686', 'release':'ALA'},
    {'reference':'perf-debuginfo-4.14.193-113.317.amzn1', 'cpu':'x86_64', 'release':'ALA'}
];

flag = 0;
foreach package_array ( pkgs ) {
  reference = NULL;
  release = NULL;
  cpu = NULL;
  el_string = NULL;
  rpm_spec_vers_cmp = NULL;
  allowmaj = NULL;
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (!empty_or_null(package_array['release'])) release = package_array['release'];
  if (!empty_or_null(package_array['cpu'])) cpu = package_array['cpu'];
  if (!empty_or_null(package_array['el_string'])) el_string = package_array['el_string'];
  if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
  if (!empty_or_null(package_array['allowmaj'])) allowmaj = package_array['allowmaj'];
  if (reference && release) {
    if (rpm_check(release:release, cpu:cpu, reference:reference, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj)) flag++;
  }
}

if (flag)
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      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, "kernel / kernel-debuginfo / kernel-debuginfo-common-x86_64 / etc");
}