Amazon Linux AMI : docker (ALAS-2017-783)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux AMI Security Advisory ALAS-2017-783.
#

include("compat.inc");

if (description)
{
  script_id(96394);
  script_version("3.4");
  script_cvs_date("Date: 2018/04/18 15:09:36");

  script_cve_id("CVE-2016-9962");
  script_xref(name:"ALAS", value:"2017-783");

  script_name(english:"Amazon Linux AMI : docker (ALAS-2017-783)");
  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:
"It was discovered that runC allowed additional container processes via
`runc exec` to be ptraced by the pid 1 of the container. This allows
the main processes of the container, if running as root, to gain
access to file descriptors of these new processes during the
initialization, which can lead to container escapes or modification of
runC state before the process is fully placed inside the container."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://alas.aws.amazon.com/ALAS-2017-783.html"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Run 'yum update docker' to update your system."
  );
  script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:P/I:P/A:P");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:docker");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:docker-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:docker-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:docker-pkg-devel");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux");

  script_set_attribute(attribute:"patch_publication_date", value:"2017/01/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/01/11");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2017-2018 Tenable Network Security, Inc.");
  script_family(english:"Amazon Linux Local Security Checks");

  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");


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);


flag = 0;
if (rpm_check(release:"ALA", cpu:"x86_64", reference:"docker-1.12.6-1.17.amzn1")) flag++;
if (rpm_check(release:"ALA", cpu:"x86_64", reference:"docker-debuginfo-1.12.6-1.17.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"docker-devel-1.12.6-1.17.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"docker-pkg-devel-1.12.6-1.17.amzn1")) 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, "docker / docker-debuginfo / docker-devel / docker-pkg-devel");
}