Ubuntu 16.04 LTS / 18.04 LTS : Apache HTTP Server vulnerabilities (USN-6729-2)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-6729-2. The text
# itself is copyright (C) Canonical, Inc. See
# <https://ubuntu.com/security/notices>. Ubuntu(R) is a registered
# trademark of Canonical, Inc.
##

include('compat.inc');

if (description)
{
  script_id(193447);
  script_version("1.0");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/04/17");

  script_cve_id("CVE-2023-38709", "CVE-2024-24795", "CVE-2024-27316");
  script_xref(name:"IAVA", value:"2024-A-0202");
  script_xref(name:"USN", value:"6729-2");

  script_name(english:"Ubuntu 16.04 LTS / 18.04 LTS : Apache HTTP Server vulnerabilities (USN-6729-2)");

  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 16.04 LTS / 18.04 LTS host has packages installed that are affected by multiple vulnerabilities as
referenced in the USN-6729-2 advisory.

  - Faulty input validation in the core of Apache allows malicious or exploitable backend/content generators
    to split HTTP responses. This issue affects Apache HTTP Server: through 2.4.58. (CVE-2023-38709)

  - HTTP Response splitting in multiple modules in Apache HTTP Server allows an attacker that can inject
    malicious response headers into backend applications to cause an HTTP desynchronization attack. Users are
    recommended to upgrade to version 2.4.59, which fixes this issue. (CVE-2024-24795)

  - HTTP/2 incoming headers exceeding the limit are temporarily buffered in nghttp2 in order to generate an
    informative HTTP 413 response. If a client does not stop sending headers, this leads to memory exhaustion.
    (CVE-2024-27316)

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-6729-2");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C");
  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:N/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-2024-27316");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2024/04/04");
  script_set_attribute(attribute:"patch_publication_date", value:"2024/04/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2024/04/17");

  script_set_attribute(attribute:"plugin_type", value:"local");
  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:"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-ssl-dev");
  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:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

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

  script_copyright(english:"Ubuntu Security Notice (C) 2024 Canonical, Inc. / NASL script (C) 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 (! ('16.04' >< os_release || '18.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 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': '16.04', 'pkgname': 'apache2', 'pkgver': '2.4.18-2ubuntu3.17+esm12'},
    {'osver': '16.04', 'pkgname': 'apache2-bin', 'pkgver': '2.4.18-2ubuntu3.17+esm12'},
    {'osver': '16.04', 'pkgname': 'apache2-data', 'pkgver': '2.4.18-2ubuntu3.17+esm12'},
    {'osver': '16.04', 'pkgname': 'apache2-dev', 'pkgver': '2.4.18-2ubuntu3.17+esm12'},
    {'osver': '16.04', 'pkgname': 'apache2-suexec-custom', 'pkgver': '2.4.18-2ubuntu3.17+esm12'},
    {'osver': '16.04', 'pkgname': 'apache2-suexec-pristine', 'pkgver': '2.4.18-2ubuntu3.17+esm12'},
    {'osver': '16.04', 'pkgname': 'apache2-utils', 'pkgver': '2.4.18-2ubuntu3.17+esm12'},
    {'osver': '18.04', 'pkgname': 'apache2', 'pkgver': '2.4.29-1ubuntu4.27+esm2'},
    {'osver': '18.04', 'pkgname': 'apache2-bin', 'pkgver': '2.4.29-1ubuntu4.27+esm2'},
    {'osver': '18.04', 'pkgname': 'apache2-data', 'pkgver': '2.4.29-1ubuntu4.27+esm2'},
    {'osver': '18.04', 'pkgname': 'apache2-dev', 'pkgver': '2.4.29-1ubuntu4.27+esm2'},
    {'osver': '18.04', 'pkgname': 'apache2-ssl-dev', 'pkgver': '2.4.29-1ubuntu4.27+esm2'},
    {'osver': '18.04', 'pkgname': 'apache2-suexec-custom', 'pkgver': '2.4.29-1ubuntu4.27+esm2'},
    {'osver': '18.04', 'pkgname': 'apache2-suexec-pristine', 'pkgver': '2.4.29-1ubuntu4.27+esm2'},
    {'osver': '18.04', 'pkgname': 'apache2-utils', 'pkgver': '2.4.29-1ubuntu4.27+esm2'}
];

var flag = 0;
foreach 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)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : ubuntu_report_get()
  );
  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');
}