Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS : Apache HTTP Server vulnerabilities (USN-8396-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-8396-1. 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(320596);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/11");

  script_cve_id(
    "CVE-2026-24072",
    "CVE-2026-28780",
    "CVE-2026-29169",
    "CVE-2026-34059"
  );
  script_xref(name:"IAVA", value:"2026-A-0423-S");
  script_xref(name:"USN", value:"8396-1");

  script_name(english:"Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS : Apache HTTP Server vulnerabilities (USN-8396-1)");

  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 / 20.04 LTS host has packages installed that are affected by
multiple vulnerabilities as referenced in the USN-8396-1 advisory.

    It was discovered that the Apache HTTP Server mod_rewrite module incorrectly handled certain privileges. A
    local attacker could possibly use this issue to obtain sensitive information. (CVE-2026-24072)

    Andrew Lacambra, Elhanan Haenel, Tianshuo Han, and Tristan Madani discovered that the Apache HTTP Server
    mod_proxy_ajp module incorrectly handled certain AJP server messages. An attacker in control of a backend
    AJP server could use this issue to cause Apache HTTP Server to crash, resulting in a denial of service, or
    possibly execute arbitrary code. (CVE-2026-28780)

    Pavel Kohout discovered that the Apache HTTP Server incorrectly handled certain memory operations in
    mod_dav_lock. A remote attacker could possibly use this issue to cause Apache HTTP Server to crash,
    resulting in a denial of service. (CVE-2026-29169)

    Elhanan Haenel discovered that Apache HTTP Server incorrectly handled certain memory operations in
    mod_proxy_ajp. A remote attacker could use this issue to cause Apache HTTP Server to crash, resulting in a
    denial of service, or possibly obtain sensitive information. (CVE-2026-34059)

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-8396-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  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_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-28780");

  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:"2026/05/04");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/06/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/06/11");

  script_set_attribute(attribute:"plugin_type", value:"local");
  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:"cpe:/o:canonical:ubuntu_linux:20.04:-: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-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-md");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libapache2-mod-proxy-html");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libapache2-mod-proxy-uwsgi");
  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) 2026 Canonical, Inc. / NASL script (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl", "ubuntu_pro_sub_detect.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 || '20.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 14.04 / 16.04 / 18.04 / 20.04', '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 ubuntu_pro_detected = get_kb_item('Host/Ubuntu/Pro/Services/esm-apps');
ubuntu_pro_detected = !empty_or_null(ubuntu_pro_detected);

var pro_caveat_needed = FALSE;

var pkgs = [
    {'osver': '14.04', 'pkgname': 'apache2', 'pkgver': '2.4.7-1ubuntu4.22+esm13', 'ubuntu_pro': TRUE},
    {'osver': '14.04', 'pkgname': 'apache2-bin', 'pkgver': '2.4.7-1ubuntu4.22+esm13', 'ubuntu_pro': TRUE},
    {'osver': '14.04', 'pkgname': 'apache2-data', 'pkgver': '2.4.7-1ubuntu4.22+esm13', 'ubuntu_pro': TRUE},
    {'osver': '14.04', 'pkgname': 'apache2-dev', 'pkgver': '2.4.7-1ubuntu4.22+esm13', 'ubuntu_pro': TRUE},
    {'osver': '14.04', 'pkgname': 'apache2-mpm-event', 'pkgver': '2.4.7-1ubuntu4.22+esm13', 'ubuntu_pro': TRUE},
    {'osver': '14.04', 'pkgname': 'apache2-mpm-itk', 'pkgver': '2.4.7-1ubuntu4.22+esm13', 'ubuntu_pro': TRUE},
    {'osver': '14.04', 'pkgname': 'apache2-mpm-prefork', 'pkgver': '2.4.7-1ubuntu4.22+esm13', 'ubuntu_pro': TRUE},
    {'osver': '14.04', 'pkgname': 'apache2-mpm-worker', 'pkgver': '2.4.7-1ubuntu4.22+esm13', 'ubuntu_pro': TRUE},
    {'osver': '14.04', 'pkgname': 'apache2-suexec', 'pkgver': '2.4.7-1ubuntu4.22+esm13', 'ubuntu_pro': TRUE},
    {'osver': '14.04', 'pkgname': 'apache2-suexec-custom', 'pkgver': '2.4.7-1ubuntu4.22+esm13', 'ubuntu_pro': TRUE},
    {'osver': '14.04', 'pkgname': 'apache2-suexec-pristine', 'pkgver': '2.4.7-1ubuntu4.22+esm13', 'ubuntu_pro': TRUE},
    {'osver': '14.04', 'pkgname': 'apache2-utils', 'pkgver': '2.4.7-1ubuntu4.22+esm13', 'ubuntu_pro': TRUE},
    {'osver': '14.04', 'pkgname': 'apache2.2-bin', 'pkgver': '2.4.7-1ubuntu4.22+esm13', 'ubuntu_pro': TRUE},
    {'osver': '14.04', 'pkgname': 'libapache2-mod-macro', 'pkgver': '1:2.4.7-1ubuntu4.22+esm13', 'ubuntu_pro': TRUE},
    {'osver': '14.04', 'pkgname': 'libapache2-mod-proxy-html', 'pkgver': '1:2.4.7-1ubuntu4.22+esm13', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'apache2', 'pkgver': '2.4.18-2ubuntu3.17+esm18', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'apache2-bin', 'pkgver': '2.4.18-2ubuntu3.17+esm18', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'apache2-data', 'pkgver': '2.4.18-2ubuntu3.17+esm18', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'apache2-dev', 'pkgver': '2.4.18-2ubuntu3.17+esm18', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'apache2-suexec-custom', 'pkgver': '2.4.18-2ubuntu3.17+esm18', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'apache2-suexec-pristine', 'pkgver': '2.4.18-2ubuntu3.17+esm18', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'apache2-utils', 'pkgver': '2.4.18-2ubuntu3.17+esm18', 'ubuntu_pro': TRUE},
    {'osver': '18.04', 'pkgname': 'apache2', 'pkgver': '2.4.29-1ubuntu4.27+esm9', 'ubuntu_pro': TRUE},
    {'osver': '18.04', 'pkgname': 'apache2-bin', 'pkgver': '2.4.29-1ubuntu4.27+esm9', 'ubuntu_pro': TRUE},
    {'osver': '18.04', 'pkgname': 'apache2-data', 'pkgver': '2.4.29-1ubuntu4.27+esm9', 'ubuntu_pro': TRUE},
    {'osver': '18.04', 'pkgname': 'apache2-dev', 'pkgver': '2.4.29-1ubuntu4.27+esm9', 'ubuntu_pro': TRUE},
    {'osver': '18.04', 'pkgname': 'apache2-ssl-dev', 'pkgver': '2.4.29-1ubuntu4.27+esm9', 'ubuntu_pro': TRUE},
    {'osver': '18.04', 'pkgname': 'apache2-suexec-custom', 'pkgver': '2.4.29-1ubuntu4.27+esm9', 'ubuntu_pro': TRUE},
    {'osver': '18.04', 'pkgname': 'apache2-suexec-pristine', 'pkgver': '2.4.29-1ubuntu4.27+esm9', 'ubuntu_pro': TRUE},
    {'osver': '18.04', 'pkgname': 'apache2-utils', 'pkgver': '2.4.29-1ubuntu4.27+esm9', 'ubuntu_pro': TRUE},
    {'osver': '20.04', 'pkgname': 'apache2', 'pkgver': '2.4.41-4ubuntu3.23+esm4', 'ubuntu_pro': TRUE},
    {'osver': '20.04', 'pkgname': 'apache2-bin', 'pkgver': '2.4.41-4ubuntu3.23+esm4', 'ubuntu_pro': TRUE},
    {'osver': '20.04', 'pkgname': 'apache2-data', 'pkgver': '2.4.41-4ubuntu3.23+esm4', 'ubuntu_pro': TRUE},
    {'osver': '20.04', 'pkgname': 'apache2-dev', 'pkgver': '2.4.41-4ubuntu3.23+esm4', 'ubuntu_pro': TRUE},
    {'osver': '20.04', 'pkgname': 'apache2-ssl-dev', 'pkgver': '2.4.41-4ubuntu3.23+esm4', 'ubuntu_pro': TRUE},
    {'osver': '20.04', 'pkgname': 'apache2-suexec-custom', 'pkgver': '2.4.41-4ubuntu3.23+esm4', 'ubuntu_pro': TRUE},
    {'osver': '20.04', 'pkgname': 'apache2-suexec-pristine', 'pkgver': '2.4.41-4ubuntu3.23+esm4', 'ubuntu_pro': TRUE},
    {'osver': '20.04', 'pkgname': 'apache2-utils', 'pkgver': '2.4.41-4ubuntu3.23+esm4', 'ubuntu_pro': TRUE},
    {'osver': '20.04', 'pkgname': 'libapache2-mod-md', 'pkgver': '2.4.41-4ubuntu3.23+esm4', 'ubuntu_pro': TRUE},
    {'osver': '20.04', 'pkgname': 'libapache2-mod-proxy-uwsgi', 'pkgver': '2.4.41-4ubuntu3.23+esm4', 'ubuntu_pro': TRUE}
];

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 (!empty_or_null(package_array['cves'])) cves = package_array['cves'];
  var pro_required = NULL;
  if (!empty_or_null(package_array['ubuntu_pro'])) pro_required = package_array['ubuntu_pro'];
  if (osver && pkgname && pkgver) {
    if (deb_check(release:osver, prefix:pkgname, reference:pkgver, cves:cves)) {
        flag++;
        if (!ubuntu_pro_detected && !pro_caveat_needed) pro_caveat_needed = pro_required;
    }
  }
}

if (flag)
{
  var extra = '';
  if (pro_caveat_needed) {
    extra += 'NOTE: This vulnerability check contains fixes that apply to packages only \n';
    extra += 'available in Ubuntu ESM repositories. Access to these package security updates \n';
    extra += 'require an Ubuntu Pro subscription.\n\n';
  }
  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');
}