Debian dla-4228 : libnginx-mod-http-auth-pam - 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-4228. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(240484);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/06/25");

  script_cve_id("CVE-2020-36309", "CVE-2024-33452");

  script_name(english:"Debian dla-4228 : libnginx-mod-http-auth-pam - 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-4228 advisory.

    - -------------------------------------------------------------------------
    Debian LTS Advisory DLA-4228-1                [email protected]
    https://www.debian.org/lts/security/                      Sylvain Beucler
    June 24, 2025                                 https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : nginx
    Version        : 1.18.0-6.1+deb11u5
    CVE ID         : CVE-2020-36309 CVE-2024-33452
    Debian Bug     : 986787

    Two vulnerabilities were discovered in Nginx, a high-performance web
    and reverse proxy server, more precisely in ngx_http_lua_module, which
    embeds the Lua scripting language into Nginx. This could lead to
    request smuggling or contribute to cache poisoning and authentication
    bypass.

    ngx_http_lua_module is provided by the optional libnginx-mod-http-lua
    binary package.

    CVE-2020-36309

        ngx_http_lua_module allows unsafe characters in an argument when
        using the API to mutate a URI, or a request or response header.

    CVE-2024-33452

        lua-nginx-module allows a remote attacker to conduct HTTP request
        smuggling via a crafted HEAD request.

    For Debian 11 bullseye, these problems have been fixed in version
    1.18.0-6.1+deb11u5.

    We recommend that you upgrade your nginx packages.

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

    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/nginx");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2020-36309");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2024-33452");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bullseye/nginx");
  script_set_attribute(attribute:"solution", value:
"Upgrade the libnginx-mod-http-auth-pam packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N");
  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:L/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-36309");

  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:"2021/04/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/06/24");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/06/25");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-http-auth-pam");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-http-cache-purge");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-http-dav-ext");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-http-echo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-http-fancyindex");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-http-geoip");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-http-geoip2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-http-headers-more-filter");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-http-image-filter");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-http-lua");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-http-ndk");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-http-perl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-http-subs-filter");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-http-uploadprogress");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-http-upstream-fair");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-http-xslt-filter");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-mail");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-nchan");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-rtmp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-stream");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-stream-geoip");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnginx-mod-stream-geoip2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:nginx");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:nginx-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:nginx-core");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:nginx-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:nginx-extras");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:nginx-full");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:nginx-light");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:11.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
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  script_category(ACT_GATHER_INFO);
  script_family(english:"Debian Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2025 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': 'libnginx-mod-http-auth-pam', 'reference': '1.18.0-6.1+deb11u5'},
    {'release': '11.0', 'prefix': 'libnginx-mod-http-cache-purge', 'reference': '1.18.0-6.1+deb11u5'},
    {'release': '11.0', 'prefix': 'libnginx-mod-http-dav-ext', 'reference': '1.18.0-6.1+deb11u5'},
    {'release': '11.0', 'prefix': 'libnginx-mod-http-echo', 'reference': '1.18.0-6.1+deb11u5'},
    {'release': '11.0', 'prefix': 'libnginx-mod-http-fancyindex', 'reference': '1.18.0-6.1+deb11u5'},
    {'release': '11.0', 'prefix': 'libnginx-mod-http-geoip', 'reference': '1.18.0-6.1+deb11u5'},
    {'release': '11.0', 'prefix': 'libnginx-mod-http-geoip2', 'reference': '1.18.0-6.1+deb11u5'},
    {'release': '11.0', 'prefix': 'libnginx-mod-http-headers-more-filter', 'reference': '1.18.0-6.1+deb11u5'},
    {'release': '11.0', 'prefix': 'libnginx-mod-http-image-filter', 'reference': '1.18.0-6.1+deb11u5'},
    {'release': '11.0', 'prefix': 'libnginx-mod-http-lua', 'reference': '1.18.0-6.1+deb11u5'},
    {'release': '11.0', 'prefix': 'libnginx-mod-http-ndk', 'reference': '1.18.0-6.1+deb11u5'},
    {'release': '11.0', 'prefix': 'libnginx-mod-http-perl', 'reference': '1.18.0-6.1+deb11u5'},
    {'release': '11.0', 'prefix': 'libnginx-mod-http-subs-filter', 'reference': '1.18.0-6.1+deb11u5'},
    {'release': '11.0', 'prefix': 'libnginx-mod-http-uploadprogress', 'reference': '1.18.0-6.1+deb11u5'},
    {'release': '11.0', 'prefix': 'libnginx-mod-http-upstream-fair', 'reference': '1.18.0-6.1+deb11u5'},
    {'release': '11.0', 'prefix': 'libnginx-mod-http-xslt-filter', 'reference': '1.18.0-6.1+deb11u5'},
    {'release': '11.0', 'prefix': 'libnginx-mod-mail', 'reference': '1.18.0-6.1+deb11u5'},
    {'release': '11.0', 'prefix': 'libnginx-mod-nchan', 'reference': '1.18.0-6.1+deb11u5'},
    {'release': '11.0', 'prefix': 'libnginx-mod-rtmp', 'reference': '1.18.0-6.1+deb11u5'},
    {'release': '11.0', 'prefix': 'libnginx-mod-stream', 'reference': '1.18.0-6.1+deb11u5'},
    {'release': '11.0', 'prefix': 'libnginx-mod-stream-geoip', 'reference': '1.18.0-6.1+deb11u5'},
    {'release': '11.0', 'prefix': 'libnginx-mod-stream-geoip2', 'reference': '1.18.0-6.1+deb11u5'},
    {'release': '11.0', 'prefix': 'nginx', 'reference': '1.18.0-6.1+deb11u5'},
    {'release': '11.0', 'prefix': 'nginx-common', 'reference': '1.18.0-6.1+deb11u5'},
    {'release': '11.0', 'prefix': 'nginx-core', 'reference': '1.18.0-6.1+deb11u5'},
    {'release': '11.0', 'prefix': 'nginx-doc', 'reference': '1.18.0-6.1+deb11u5'},
    {'release': '11.0', 'prefix': 'nginx-extras', 'reference': '1.18.0-6.1+deb11u5'},
    {'release': '11.0', 'prefix': 'nginx-full', 'reference': '1.18.0-6.1+deb11u5'},
    {'release': '11.0', 'prefix': 'nginx-light', 'reference': '1.18.0-6.1+deb11u5'}
];

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_WARNING,
    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, 'libnginx-mod-http-auth-pam / libnginx-mod-http-cache-purge / etc');
}