Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS : Apache HTTP Server vulnerabilities (USN-3937-1)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-3937-1. The text 
# itself is copyright (C) Canonical, Inc. See 
# <http://www.ubuntu.com/usn/>. Ubuntu(R) is a registered 
# trademark of Canonical, Inc.
#

include('compat.inc');

if (description)
{
  script_id(123787);
  script_version("1.14");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/08/27");

  script_cve_id(
    "CVE-2018-17189",
    "CVE-2018-17199",
    "CVE-2019-0196",
    "CVE-2019-0211",
    "CVE-2019-0217",
    "CVE-2019-0220"
  );
  script_xref(name:"USN", value:"3937-1");
  script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2022/05/03");
  script_xref(name:"CEA-ID", value:"CEA-2019-0203");

  script_name(english:"Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS : Apache HTTP Server vulnerabilities (USN-3937-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS host has packages installed that are affected by multiple
vulnerabilities as referenced in the USN-3937-1 advisory.

    Charles Fol discovered that the Apache HTTP Server incorrectly handled the scoreboard shared memory area.
    A remote attacker able to upload and run scripts could possibly use this issue to execute arbitrary code
    with root privileges. (CVE-2019-0211)

    It was discovered that the Apache HTTP Server HTTP/2 module incorrectly handled certain requests. A remote
    attacker could possibly use this issue to cause the server to consume resources, leading to a denial of
    service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 18.10. (CVE-2018-17189)

    It was discovered that the Apache HTTP Server incorrectly handled session expiry times. When used with
    mod_session_cookie, this may result in the session expiry time to be ignored, contrary to expectations.
    (CVE-2018-17199)

    Craig Young discovered that the Apache HTTP Server HTTP/2 module incorrectly handled certain requests. A
    remote attacker could possibly use this issue to cause the server to process requests incorrectly. This
    issue only affected Ubuntu 18.04 LTS and Ubuntu 18.10. (CVE-2019-0196)

    Simon Kappel discovered that the Apache HTTP Server mod_auth_digest module incorrectly handled threads. A
    remote attacker with valid credentials could possibly use this issue to authenticate using another
    username, bypassing access control restrictions. (CVE-2019-0217)

    Bernhard Lorenz discovered that the Apache HTTP Server was inconsistent when processing requests
    containing multiple consecutive slashes. This could lead to directives such as LocationMatch and
    RewriteRule to perform contrary to expectations. (CVE-2019-0220)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/notices/USN-3937-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  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:F/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:F/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-0211");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/01/30");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/04/04");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/04/05");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:apache2-bin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:apache2-data");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:apache2-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:apache2-mpm-event");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:apache2-mpm-itk");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:apache2-mpm-prefork");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:apache2-mpm-worker");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:apache2-ssl-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:apache2-suexec");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:apache2-suexec-custom");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:apache2-suexec-pristine");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:apache2-utils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:apache2.2-bin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libapache2-mod-macro");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libapache2-mod-proxy-html");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:apache2");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"Ubuntu Security Notice (C) 2019-2024 Canonical, Inc. / NASL script (C) 2019-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l");

  exit(0);
}

include('debian_package.inc');

if ( ! get_kb_item('Host/local_checks_enabled') ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/Ubuntu/release');
if ( isnull(os_release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
os_release = chomp(os_release);
if (! ('14.04' >< os_release || '16.04' >< os_release || '18.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 14.04 / 16.04 / 18.04', 'Ubuntu ' + os_release);
if ( ! get_kb_item('Host/Debian/dpkg-l') ) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Ubuntu', cpu);

var pkgs = [
    {'osver': '14.04', 'pkgname': 'apache2', 'pkgver': '2.4.7-1ubuntu4.22'},
    {'osver': '14.04', 'pkgname': 'apache2-bin', 'pkgver': '2.4.7-1ubuntu4.22'},
    {'osver': '14.04', 'pkgname': 'apache2-data', 'pkgver': '2.4.7-1ubuntu4.22'},
    {'osver': '14.04', 'pkgname': 'apache2-dev', 'pkgver': '2.4.7-1ubuntu4.22'},
    {'osver': '14.04', 'pkgname': 'apache2-mpm-event', 'pkgver': '2.4.7-1ubuntu4.22'},
    {'osver': '14.04', 'pkgname': 'apache2-mpm-itk', 'pkgver': '2.4.7-1ubuntu4.22'},
    {'osver': '14.04', 'pkgname': 'apache2-mpm-prefork', 'pkgver': '2.4.7-1ubuntu4.22'},
    {'osver': '14.04', 'pkgname': 'apache2-mpm-worker', 'pkgver': '2.4.7-1ubuntu4.22'},
    {'osver': '14.04', 'pkgname': 'apache2-suexec', 'pkgver': '2.4.7-1ubuntu4.22'},
    {'osver': '14.04', 'pkgname': 'apache2-suexec-custom', 'pkgver': '2.4.7-1ubuntu4.22'},
    {'osver': '14.04', 'pkgname': 'apache2-suexec-pristine', 'pkgver': '2.4.7-1ubuntu4.22'},
    {'osver': '14.04', 'pkgname': 'apache2-utils', 'pkgver': '2.4.7-1ubuntu4.22'},
    {'osver': '14.04', 'pkgname': 'apache2.2-bin', 'pkgver': '2.4.7-1ubuntu4.22'},
    {'osver': '14.04', 'pkgname': 'libapache2-mod-macro', 'pkgver': '1:2.4.7-1ubuntu4.22'},
    {'osver': '14.04', 'pkgname': 'libapache2-mod-proxy-html', 'pkgver': '1:2.4.7-1ubuntu4.22'},
    {'osver': '16.04', 'pkgname': 'apache2', 'pkgver': '2.4.18-2ubuntu3.10'},
    {'osver': '16.04', 'pkgname': 'apache2-bin', 'pkgver': '2.4.18-2ubuntu3.10'},
    {'osver': '16.04', 'pkgname': 'apache2-data', 'pkgver': '2.4.18-2ubuntu3.10'},
    {'osver': '16.04', 'pkgname': 'apache2-dev', 'pkgver': '2.4.18-2ubuntu3.10'},
    {'osver': '16.04', 'pkgname': 'apache2-suexec-custom', 'pkgver': '2.4.18-2ubuntu3.10'},
    {'osver': '16.04', 'pkgname': 'apache2-suexec-pristine', 'pkgver': '2.4.18-2ubuntu3.10'},
    {'osver': '16.04', 'pkgname': 'apache2-utils', 'pkgver': '2.4.18-2ubuntu3.10'},
    {'osver': '18.04', 'pkgname': 'apache2', 'pkgver': '2.4.29-1ubuntu4.6'},
    {'osver': '18.04', 'pkgname': 'apache2-bin', 'pkgver': '2.4.29-1ubuntu4.6'},
    {'osver': '18.04', 'pkgname': 'apache2-data', 'pkgver': '2.4.29-1ubuntu4.6'},
    {'osver': '18.04', 'pkgname': 'apache2-dev', 'pkgver': '2.4.29-1ubuntu4.6'},
    {'osver': '18.04', 'pkgname': 'apache2-ssl-dev', 'pkgver': '2.4.29-1ubuntu4.6'},
    {'osver': '18.04', 'pkgname': 'apache2-suexec-custom', 'pkgver': '2.4.29-1ubuntu4.6'},
    {'osver': '18.04', 'pkgname': 'apache2-suexec-pristine', 'pkgver': '2.4.29-1ubuntu4.6'},
    {'osver': '18.04', 'pkgname': 'apache2-utils', 'pkgver': '2.4.29-1ubuntu4.6'}
];

var flag = 0;
foreach var package_array ( pkgs ) {
  var osver = NULL;
  var pkgname = NULL;
  var pkgver = NULL;
  if (!empty_or_null(package_array['osver'])) osver = package_array['osver'];
  if (!empty_or_null(package_array['pkgname'])) pkgname = package_array['pkgname'];
  if (!empty_or_null(package_array['pkgver'])) pkgver = package_array['pkgver'];
  if (osver && pkgname && pkgver) {
    if (ubuntu_check(osver:osver, pkgname:pkgname, pkgver:pkgver)) flag++;
  }
}

if (flag)
{
  var extra = '';
  extra += ubuntu_report_get();
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'apache2 / apache2-bin / apache2-data / apache2-dev / etc');
}