Debian dsa-6575 : libnginx-mod-http-geoip - 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-6575. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(370146);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/21");

  script_cve_id(
    "CVE-2026-15176",
    "CVE-2026-93479",
    "CVE-2026-95101",
    "CVE-2026-97205",
    "CVE-2026-97629"
  );

  script_name(english:"Debian dsa-6575 : libnginx-mod-http-geoip - 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 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the
dsa-6575 advisory.

    - -------------------------------------------------------------------------
    Debian Security Advisory DSA-6575-1                   [email protected]
    https://www.debian.org/security/                               Jan Moj
    October 21, 2026                      https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : nginx
    CVE ID         : CVE-2026-15176 CVE-2026-93479 CVE-2026-95101 CVE-2026-97205
                     CVE-2026-97629

    Several vulnerabilities were discovered in nginx, a high performance web
    and reverse proxy server. Depending on the configuration, these could
    result in memory corruption, denial of service, injection of requests to
    backend servers, or bypass of client certificate authentication.

    CVE-2026-15176

        Mapping a rewritten request URI to a filesystem path in a location
        using the alias directive could cause a buffer overflow.

    CVE-2026-93479

        Evaluation of string expressions in the HTTP and stream modules
        could overwrite reserved buffer space, resulting in a buffer overflow.
        Affected operations include evaluation of variable document roots
        and access log paths.

        The affected code was introduced into the trixie package by an earlier
        security backport.

    CVE-2026-95101

        Incorrect handling of fragmented unknown HTTP/3 frames could cause
        their contents to be treated as request body data. When proxying
        requests, this could allow injection of requests into a backend server
        or bypass of request body size limits.

    CVE-2026-97205

        A counter tracking pending asynchronous operations could overflow,
        causing request memory to be freed while still in use. This
        use-after-free could result in memory corruption or denial of service.

    CVE-2026-97629

        Incomplete synchronisation of TLS session ticket keys between worker
        processes could leave a worker using uninitialised key material. This
        could allow forged TLS sessions and bypass of client certificate
        authentication.

    For the stable distribution (trixie), these problems have been fixed in
    version 1.26.3-3+deb13u10.

    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 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 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-2026-15176");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-93479");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-95101");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-97205");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-97629");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/trixie/nginx");
  script_set_attribute(attribute:"solution", value:
"Upgrade the libnginx-mod-http-geoip packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:H/Au:N/C:C/I:C/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:H/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-97205");

  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:"2026/10/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/10/21");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/21");

  script_set_attribute(attribute:"plugin_type", value:"local");
  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-image-filter");
  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-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-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: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-dev");
  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:13.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  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_info2.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:"^(13)\.[0-9]+", string:debian_release)) audit(AUDIT_OS_NOT, 'Debian 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': '13.0', 'prefix': 'libnginx-mod-http-geoip', 'reference': '1.26.3-3+deb13u10'},
    {'release': '13.0', 'prefix': 'libnginx-mod-http-image-filter', 'reference': '1.26.3-3+deb13u10'},
    {'release': '13.0', 'prefix': 'libnginx-mod-http-perl', 'reference': '1.26.3-3+deb13u10'},
    {'release': '13.0', 'prefix': 'libnginx-mod-http-xslt-filter', 'reference': '1.26.3-3+deb13u10'},
    {'release': '13.0', 'prefix': 'libnginx-mod-mail', 'reference': '1.26.3-3+deb13u10'},
    {'release': '13.0', 'prefix': 'libnginx-mod-stream', 'reference': '1.26.3-3+deb13u10'},
    {'release': '13.0', 'prefix': 'libnginx-mod-stream-geoip', 'reference': '1.26.3-3+deb13u10'},
    {'release': '13.0', 'prefix': 'nginx', 'reference': '1.26.3-3+deb13u10'},
    {'release': '13.0', 'prefix': 'nginx-common', 'reference': '1.26.3-3+deb13u10'},
    {'release': '13.0', 'prefix': 'nginx-core', 'reference': '1.26.3-3+deb13u10'},
    {'release': '13.0', 'prefix': 'nginx-dev', 'reference': '1.26.3-3+deb13u10'},
    {'release': '13.0', 'prefix': 'nginx-doc', 'reference': '1.26.3-3+deb13u10'},
    {'release': '13.0', 'prefix': 'nginx-extras', 'reference': '1.26.3-3+deb13u10'},
    {'release': '13.0', 'prefix': 'nginx-full', 'reference': '1.26.3-3+deb13u10'},
    {'release': '13.0', 'prefix': 'nginx-light', 'reference': '1.26.3-3+deb13u10'}
];

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, 'libnginx-mod-http-geoip / libnginx-mod-http-image-filter / etc');
}