Debian dla-4373 : libwebsockets-dev - 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-4373. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(275575);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/11/17");

  script_cve_id("CVE-2025-11677", "CVE-2025-11678");

  script_name(english:"Debian dla-4373 : libwebsockets-dev - 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-4373 advisory.

    - -----------------------------------------------------------------------
    Debian LTS Advisory DLA-4373-1              [email protected]
    https://www.debian.org/lts/security/                      Utkarsh Gupta
    November 17, 2025                           https://wiki.debian.org/LTS
    - -----------------------------------------------------------------------

    Package        : libwebsockets
    Version        : 4.0.20-2+deb11u1
    CVE ID         : CVE-2025-11677 CVE-2025-11678
    Debian Bug     : 1118746 1118747

    Libwebsockets (LWS) is a flexible, lightweight pure C library for
    implementing modern network protocols easily with a tiny footprint,
    using a nonblocking event loop.

    CVE-2025-11677

        Use After Free in WebSocket server implementation in
        lws_handshake_server in warmcat libwebsockets may allow an attacker,
        in specific configurations where the user provides a callback
        function that handles LWS_CALLBACK_HTTP_CONFIRM_UPGRADE, to achieve
        denial of service.

    CVE-2025-11678

        Stack-based Buffer Overflow in lws_adns_parse_label in warmcat
        libwebsockets allows, when the LWS_WITH_SYS_ASYNC_DNS flag is
        enabled during compilation, to overflow the label_stack, when the
        attacker is able to sniff a DNS request in order to craft a response
        with a matching ID containing a label longer than the maximum.

    For Debian 11 bullseye, these problems have been fixed in version
    4.0.20-2+deb11u1.

    We recommend that you upgrade your libwebsockets packages.

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

    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.");
  # https://security-tracker.debian.org/tracker/source-package/libwebsockets
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?adc7ba17");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2025-11677");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2025-11678");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bullseye/libwebsockets");
  script_set_attribute(attribute:"solution", value:
"Upgrade the libwebsockets-dev packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  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: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:A/AC:L/AT:P/PR:N/UI:P/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-2025-11677");
  script_set_attribute(attribute:"cvss4_score_source", value:"CVE-2025-11678");

  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:"2025/10/20");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/11/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/11/17");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libwebsockets-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libwebsockets-test-server");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libwebsockets-test-server-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libwebsockets16");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:11.0");
  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) 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': 'libwebsockets-dev', 'reference': '4.0.20-2+deb11u1'},
    {'release': '11.0', 'prefix': 'libwebsockets-test-server', 'reference': '4.0.20-2+deb11u1'},
    {'release': '11.0', 'prefix': 'libwebsockets-test-server-common', 'reference': '4.0.20-2+deb11u1'},
    {'release': '11.0', 'prefix': 'libwebsockets16', 'reference': '4.0.20-2+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, 'libwebsockets-dev / libwebsockets-test-server / etc');
}