Debian dsa-6323 : apache2 - security update

#%NASL_MIN_LEVEL 80900
#
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory dsa-6323. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(319609);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/12");

  script_cve_id("CVE-2026-49975");
  script_xref(name:"IAVA", value:"2026-A-0558");

  script_name(english:"Debian dsa-6323 : apache2 - security update");

  script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing a security-related update.");
  script_set_attribute(attribute:"description", value:
"The remote Debian 12 / 13 host has packages installed that are affected by a vulnerability as referenced in the dsa-6323
advisory.

    - -------------------------------------------------------------------------
    Debian Security Advisory DSA-6323-1                   [email protected]
    https://www.debian.org/security/                     Salvatore Bonaccorso
    June 06, 2026                         https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : apache2
    CVE ID         : CVE-2026-49975
    Debian Bug     : 1138750

    It was discovered that incorrect cookie header accounting in the HTTP/2
    implementation of the Apache HTTP server may result in denial of service
    (excessive resources consumption).

    For the oldstable distribution (bookworm), this problem has been fixed
    in version 2.4.67-1~deb12u3.

    For the stable distribution (trixie), this problem has been fixed in
    version 2.4.67-1~deb13u3.

    We recommend that you upgrade your apache2 packages.

    For the detailed security status of apache2 please refer to its security
    tracker page at:
    https://security-tracker.debian.org/tracker/apache2

    Further information about Debian Security Advisories, how to apply
    these updates to your system and frequently asked questions can be
    found at: https://www.debian.org/security/

    Mailing list: [email protected]

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

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/source-package/apache2");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-49975");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bookworm/apache2");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/trixie/apache2");
  script_set_attribute(attribute:"solution", value:
"Upgrade the apache2 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:POC/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:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:P");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-49975");

  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:"2026/06/03");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/06/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/06/06");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:apache2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:apache2-bin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:apache2-data");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:apache2-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:apache2-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:apache2-ssl-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:apache2-suexec-custom");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:apache2-suexec-pristine");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:apache2-utils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libapache2-mod-md");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libapache2-mod-proxy-uwsgi");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:12.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:13.0");
  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:"Debian Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Debian/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);
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);

var debian_release = get_kb_item('Host/Debian/release');
if ( isnull(debian_release) ) audit(AUDIT_OS_NOT, 'Debian');
debian_release = chomp(debian_release);
if (! preg(pattern:"^(12)\.[0-9]+|^(13)\.[0-9]+", string:debian_release)) audit(AUDIT_OS_NOT, 'Debian 12.0 / 13.0', 'Debian ' + debian_release);
var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Debian', cpu);

var pkgs = [
    {'release': '12.0', 'prefix': 'apache2', 'reference': '2.4.67-1~deb12u3'},
    {'release': '12.0', 'prefix': 'apache2-bin', 'reference': '2.4.67-1~deb12u3'},
    {'release': '12.0', 'prefix': 'apache2-data', 'reference': '2.4.67-1~deb12u3'},
    {'release': '12.0', 'prefix': 'apache2-dev', 'reference': '2.4.67-1~deb12u3'},
    {'release': '12.0', 'prefix': 'apache2-doc', 'reference': '2.4.67-1~deb12u3'},
    {'release': '12.0', 'prefix': 'apache2-ssl-dev', 'reference': '2.4.67-1~deb12u3'},
    {'release': '12.0', 'prefix': 'apache2-suexec-custom', 'reference': '2.4.67-1~deb12u3'},
    {'release': '12.0', 'prefix': 'apache2-suexec-pristine', 'reference': '2.4.67-1~deb12u3'},
    {'release': '12.0', 'prefix': 'apache2-utils', 'reference': '2.4.67-1~deb12u3'},
    {'release': '12.0', 'prefix': 'libapache2-mod-md', 'reference': '2.4.67-1~deb12u3'},
    {'release': '12.0', 'prefix': 'libapache2-mod-proxy-uwsgi', 'reference': '2.4.67-1~deb12u3'},
    {'release': '13.0', 'prefix': 'apache2', 'reference': '2.4.67-1~deb13u3'},
    {'release': '13.0', 'prefix': 'apache2-bin', 'reference': '2.4.67-1~deb13u3'},
    {'release': '13.0', 'prefix': 'apache2-data', 'reference': '2.4.67-1~deb13u3'},
    {'release': '13.0', 'prefix': 'apache2-dev', 'reference': '2.4.67-1~deb13u3'},
    {'release': '13.0', 'prefix': 'apache2-doc', 'reference': '2.4.67-1~deb13u3'},
    {'release': '13.0', 'prefix': 'apache2-ssl-dev', 'reference': '2.4.67-1~deb13u3'},
    {'release': '13.0', 'prefix': 'apache2-suexec-custom', 'reference': '2.4.67-1~deb13u3'},
    {'release': '13.0', 'prefix': 'apache2-suexec-pristine', 'reference': '2.4.67-1~deb13u3'},
    {'release': '13.0', 'prefix': 'apache2-utils', 'reference': '2.4.67-1~deb13u3'}
];

var flag = 0;
foreach package_array ( pkgs ) {
  var _release = NULL;
  var prefix = NULL;
  var reference = NULL;
  if (!empty_or_null(package_array['release'])) _release = package_array['release'];
  if (!empty_or_null(package_array['prefix'])) prefix = package_array['prefix'];
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (_release && prefix && reference) {
    if (deb_check(release:_release, prefix:prefix, reference:reference)) flag++;
  }
}

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