Amazon Linux AMI : tomcat8 (ALAS-2018-1056)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux AMI Security Advisory ALAS-2018-1056.
#

include("compat.inc");

if (description)
{
  script_id(111611);
  script_version("1.2");
  script_cvs_date("Date: 2018/08/31 12:25:01");

  script_cve_id("CVE-2018-1336", "CVE-2018-8014", "CVE-2018-8034", "CVE-2018-8037");
  script_xref(name:"ALAS", value:"2018-1056");

  script_name(english:"Amazon Linux AMI : tomcat8 (ALAS-2018-1056)");
  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 defaults settings for the CORS filter provided in Apache Tomcat
are insecure and enable 'supportsCredentials' for all origins. It is
expected that users of the CORS filter will have configured it
appropriately for their environment rather than using it in the
default configuration. Therefore, it is expected that most users will
not be impacted by this issue.(CVE-2018-8014)

An improper handing of overflow in the UTF-8 decoder with
supplementary characters can lead to an infinite loop in the decoder
causing a Denial of Service. Versions Affected: Apache Tomcat 8.5.0 to
8.5.30. (CVE-2018-1336)

The host name verification when using TLS with the WebSocket client
was missing. It is now enabled by default. Versions Affected: Apache
Tomcat 8.5.0 to 8.5.31.(CVE-2018-8034)

A bug in the tracking of connection closures can lead to reuse of user
sessions in a new connection. Versions Affected: Apache Tomcat 8.5.5
to 8.5.31.(CVE-2018-8037)"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://alas.aws.amazon.com/ALAS-2018-1056.html"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Run 'yum update tomcat8' to update your system."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/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:tomcat8");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat8-admin-webapps");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat8-docs-webapp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat8-el-3.0-api");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat8-javadoc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat8-jsp-2.3-api");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat8-lib");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat8-log4j");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat8-servlet-3.1-api");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat8-webapps");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux");

  script_set_attribute(attribute:"patch_publication_date", value:"2018/08/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/08/10");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2018 and is owned by Tenable, Inc. or an Affiliate thereof.");
  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", reference:"tomcat8-8.5.32-1.78.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"tomcat8-admin-webapps-8.5.32-1.78.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"tomcat8-docs-webapp-8.5.32-1.78.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"tomcat8-el-3.0-api-8.5.32-1.78.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"tomcat8-javadoc-8.5.32-1.78.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"tomcat8-jsp-2.3-api-8.5.32-1.78.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"tomcat8-lib-8.5.32-1.78.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"tomcat8-log4j-8.5.32-1.78.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"tomcat8-servlet-3.1-api-8.5.32-1.78.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"tomcat8-webapps-8.5.32-1.78.amzn1")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:rpm_report_get());
  else security_hole(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "tomcat8 / tomcat8-admin-webapps / tomcat8-docs-webapp / etc");
}