Amazon Linux AMI : httpd24 (ALAS-2019-1166)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux AMI Security Advisory ALAS-2019-1166.
#

include("compat.inc");

if (description)
{
  script_id(122758);
  script_version("1.3");
  script_cvs_date("Date: 2020/02/05");

  script_cve_id("CVE-2018-17189", "CVE-2018-17199", "CVE-2019-0190");
  script_xref(name:"ALAS", value:"2019-1166");

  script_name(english:"Amazon Linux AMI : httpd24 (ALAS-2019-1166)");
  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:
"In Apache HTTP server by sending request bodies in a slow loris way to
plain resources, the h2 stream for that request unnecessarily occupied
a server thread cleaning up that incoming data. This affects only
HTTP/2 (mod_http2) connections. (CVE-2018-17189)

A bug exists in the way mod_ssl handled client renegotiations. A
remote attacker could send a carefully crafted request that would
cause mod_ssl to enter a loop leading to a denial of service.
(CVE-2019-0190)

In Apache HTTP Server mod_session checks the session expiry time
before decoding the session. This causes session expiry time to be
ignored for mod_session_cookie sessions since the expiry time is
loaded when the session is decoded. (CVE-2018-17199)"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://alas.aws.amazon.com/ALAS-2019-1166.html"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Run 'yum update httpd24' to update your system."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2018-17199");
  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:amazon:linux:httpd24");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:httpd24-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:httpd24-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:httpd24-manual");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:httpd24-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:mod24_ldap");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:mod24_md");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:mod24_proxy_html");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:mod24_session");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:mod24_ssl");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux");

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/01/30");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/03/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/03/12");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2019-2020 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:"httpd24-2.4.38-1.86.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"httpd24-debuginfo-2.4.38-1.86.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"httpd24-devel-2.4.38-1.86.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"httpd24-manual-2.4.38-1.86.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"httpd24-tools-2.4.38-1.86.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"mod24_ldap-2.4.38-1.86.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"mod24_md-2.4.38-1.86.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"mod24_proxy_html-2.4.38-1.86.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"mod24_session-2.4.38-1.86.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"mod24_ssl-2.4.38-1.86.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, "httpd24 / httpd24-debuginfo / httpd24-devel / httpd24-manual / etc");
}