Debian dla-4270 : 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 dla-4270. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(249166);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/01/21");

  script_cve_id(
    "CVE-2024-42516",
    "CVE-2024-43204",
    "CVE-2024-43394",
    "CVE-2024-47252",
    "CVE-2025-23048",
    "CVE-2025-49630",
    "CVE-2025-49812",
    "CVE-2025-53020",
    "CVE-2025-54090"
  );
  script_xref(name:"IAVA", value:"2025-A-0508-S");
  script_xref(name:"IAVA", value:"2025-A-0547-S");

  script_name(english:"Debian dla-4270 : apache2 - security update");

  script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing one or more security-related updates.");
  script_set_attribute(attribute:"description", value:
"The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the
dla-4270 advisory.

    - -------------------------------------------------------------------------
    Debian LTS Advisory DLA-4270-1                [email protected]
    https://www.debian.org/lts/security/                   Bastien Roucaris
    August 12, 2025                               https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : apache2
    Version        : 2.4.65-1~deb11u1
    CVE ID         : CVE-2024-42516 CVE-2024-43204 CVE-2024-43394 CVE-2024-47252
                     CVE-2025-23048 CVE-2025-49630 CVE-2025-49812 CVE-2025-53020
                     CVE-2025-54090

    Multiple vulnerabilities have been addressed in Apache,
    a widely used web server.

    Please note that the fix for CVE-2025-23048, included in this DLA,
    may cause some SSL-enabled websites to encounter the error AH02032.
    Additional details are provided at the end of this advisory.

    CVE-2024-42516

        HTTP response splitting in the core of Apache HTTP Server allows an
        attacker who can manipulate the Content-Type response headers of
        applications hosted or proxied by the server can split the HTTP response

    CVE-2024-43204

        A SSRF (Server Side Request Forgery) was found in Apache HTTP Server
        with mod_proxy loaded allows an attacker to
        send outbound proxy requests to a URL controlled by the attacker.
        This attack requires an unlikely configuration where mod_headers
        is configured to modify the Content-Type request or response header with a
        value provided in the HTTP request

    CVE-2024-43394

        A Server-Side Request Forgery (SSRF) in Apache HTTP Server on Windows
        allows to potentially leak NTLM hashes to a malicious server via  mod_rewrite
        or apache expressions that pass unvalidated request input.

    CVE-2024-47252

        Insufficient escaping of user-supplied data in mod_ssl allows an untrusted
        SSL/TLS client to insert escape characters into log files in some
        configurations. In a logging configuration where CustomLog is used with
        %{varname}x or %{varname}c to log variables provided by mod_ssl such as
        SSL_TLS_SNI, no escaping is performed by either mod_log_config or mod_ssl and
        unsanitized data provided by the client may appear in log files.

    CVE-2025-23048

        An access control bypass by trusted clients is possible using TLS 1.3
        session resumption. Configurations are affected when mod_ssl is
        configured for multiple virtual hosts, with each restricted to a
        different set of trusted client certificates
        (for example with a different SSLCACertificateFile/Path setting).
        In such a case, a client trusted to access one virtual host may be able to
        access another virtual host, if SSLStrictSNIVHostCheck is not enabled
        in either virtual host.

    CVE-2025-49630

        In certain proxy configurations, a denial of service attack against
        Apache HTTP Server can be triggered by untrusted clients causing
        an assertion in mod_proxy_http2. Configurations affected are a
        reverse proxy is configured for an HTTP/2 backend, with
        ProxyPreserveHost set to on.

    CVE-2025-49812

        In some mod_ssl configurations on Apache HTTP server, an HTTP
        desynchronisation attack allows a man-in-the-middle attacker
        to hijack an HTTP session via a TLS upgrade. Only configurations
        using SSLEngine optional to enable TLS upgrades are affected.
        Support for TLS upgrade was removed.

    CVE-2025-53020

        A late Release of Memory after Effective Lifetime vulnerability
        was found in Apache HTTP Server.

    CVE-2025-54090

        A bug in Apache HTTP Server 2.4.64 results in all
        RewriteCond expr ... tests evaluating as true

    For Debian 11 bullseye, these problems have been fixed in version
    2.4.65-1~deb11u1.

    Note that following the resolution of CVE-2025-23048,
    some SSL-enabled websites may begin encountering
    the error (AH02032):

        Misdirected Request:
        The client needs a new connection for this request as the
        requested host name does not match the Server Name Indication
        (SNI) in use for this connection.

    This behavior is particularly noticeable with AWS Application
    Load Balancers. Although they support intelligent SNI handling,
    they do not (as of this writing) relay SNI data to the target
    server, resulting in failed connections when hostnames don??t align.

    Without an SNI provided by the client, there is nothing httpd
    can do to determine which vhost/configuration should be
    used to provide the correct certificate (and TLS authentication
    eventually) whenever multiple vhosts listen on the same IP:port.

    That's because reading the HTTP Host header necessarily has to
    happen after the TLS handshake/auth/decryption (and later
    renegotiation is not an option with TLSv1.3).

    So those connections fall back to the first vhost declared on
    the IP:port for the TLS handshake part, and if the request
    Host header finally matches a different vhost with a different
    TLS configuration it's rejected with AH02032.

    Before 2.4.64 the check was not accurate and would allow that,
    with security implications.

    As a workaround, you may (after a risk analysis) generate a
    wildcard certificate. If you??re managing multiple domains,
    consolidate them into a single certificate by including each
    wildcard domain as an alias. Then, update the Apache configuration
    to reference this unified certificate.

    Another possible workaround is to configure each virtual host to
    listen on a separate port. This approach avoids SNI-related issues
    by ensuring that each vhost is uniquely addressed through its own
    connection endpoint, thereby allowing distinct TLS configurations
    without ambiguity.

    This error may also stem from a misconfigured HAProxy setup.
    In such cases, enabling dynamic SNI handling on HAProxy might be
    necessary to ensure that the correct hostname is passed through
    during the TLS handshake. After risk analysis, it could be done
    by using sni req.hdr(Host) directive.

    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 LTS security advisories, how to apply
    these updates to your system and frequently asked questions can be
    found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian 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://security-tracker.debian.org/tracker/source-package/apache2");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2024-42516");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2024-43204");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2024-43394");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2024-47252");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2025-23048");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2025-49630");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2025-49812");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2025-53020");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2025-54090");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bullseye/apache2");
  script_set_attribute(attribute:"solution", value:
"Upgrade the apache2 packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/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:H/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-2025-23048");

  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:"2025/07/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/08/12");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/08/12");

  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:11.0");
  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) 2025-2026 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:"^(11)\.[0-9]+", string:debian_release)) audit(AUDIT_OS_NOT, 'Debian 11.0', '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': '11.0', 'prefix': 'apache2', 'reference': '2.4.65-1~deb11u1'},
    {'release': '11.0', 'prefix': 'apache2-bin', 'reference': '2.4.65-1~deb11u1'},
    {'release': '11.0', 'prefix': 'apache2-data', 'reference': '2.4.65-1~deb11u1'},
    {'release': '11.0', 'prefix': 'apache2-dev', 'reference': '2.4.65-1~deb11u1'},
    {'release': '11.0', 'prefix': 'apache2-doc', 'reference': '2.4.65-1~deb11u1'},
    {'release': '11.0', 'prefix': 'apache2-ssl-dev', 'reference': '2.4.65-1~deb11u1'},
    {'release': '11.0', 'prefix': 'apache2-suexec-custom', 'reference': '2.4.65-1~deb11u1'},
    {'release': '11.0', 'prefix': 'apache2-suexec-pristine', 'reference': '2.4.65-1~deb11u1'},
    {'release': '11.0', 'prefix': 'apache2-utils', 'reference': '2.4.65-1~deb11u1'},
    {'release': '11.0', 'prefix': 'libapache2-mod-md', 'reference': '2.4.65-1~deb11u1'},
    {'release': '11.0', 'prefix': 'libapache2-mod-proxy-uwsgi', 'reference': '2.4.65-1~deb11u1'}
];

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');
}