Ubuntu 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS : Libwebsockets vulnerabilities (USN-8822-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-8822-1. The text
# itself is copyright (C) Canonical, Inc. See
# <https://ubuntu.com/security/notices>. Ubuntu(R) is a registered
# trademark of Canonical, Inc.
##

include('compat.inc');

if (description)
{
  script_id(350921);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/29");

  script_cve_id("CVE-2026-10650", "CVE-2026-78161");
  script_xref(name:"USN", value:"8822-1");

  script_name(english:"Ubuntu 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS : Libwebsockets vulnerabilities (USN-8822-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS host has packages installed that are affected by
multiple vulnerabilities as referenced in the USN-8822-1 advisory.

    It was discovered that Libwebsockets incorrectly handled certain SSH protocol messages in its SSH protocol
    handler. A remote attacker could possibly use this issue to cause Libwebsockets to consume excessive
    resources, resulting in a denial of service. (CVE-2026-10650)

    It was discovered that Libwebsockets incorrectly handled certain malformed CBOR data. A remote attacker
    could possibly use this issue to cause Libwebsockets to crash, resulting in a denial of service, or
    execute arbitrary code. This issue only affected Ubuntu 24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-78161)

Tenable has extracted the preceding description block directly from the Ubuntu 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://ubuntu.com/security/notices/USN-8822-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected 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:L/I:L/A:L");
  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:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/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-2026-78161");

  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:"2026/06/02");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/09/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/29");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:20.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:22.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:24.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:26.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libwebsockets-evlib-ev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libwebsockets-evlib-glib");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libwebsockets-evlib-uv");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libwebsockets-test-server");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libwebsockets-test-server-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libwebsockets15");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libwebsockets16");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libwebsockets19t64");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Ubuntu Local Security Checks");

  script_copyright(english:"Ubuntu Security Notice (C) 2026 Canonical, Inc. / NASL script (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/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);
var os_release = get_kb_item('Host/Ubuntu/release');
if ( isnull(os_release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
os_release = chomp(os_release);
if (! ('20.04' >< os_release || '22.04' >< os_release || '24.04' >< os_release || '26.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 20.04 / 22.04 / 24.04 / 26.04', 'Ubuntu ' + os_release);
if ( ! get_kb_item('Host/Debian/dpkg-l') ) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Ubuntu', cpu);

var pkgs = [
    {'osver': '20.04', 'pkgname': 'libwebsockets-test-server', 'pkgver': '3.2.1-3ubuntu0.1~esm2', 'cves': ['CVE-2026-10650']},
    {'osver': '20.04', 'pkgname': 'libwebsockets-test-server-common', 'pkgver': '3.2.1-3ubuntu0.1~esm2', 'cves': ['CVE-2026-10650']},
    {'osver': '20.04', 'pkgname': 'libwebsockets15', 'pkgver': '3.2.1-3ubuntu0.1~esm2', 'cves': ['CVE-2026-10650']},
    {'osver': '22.04', 'pkgname': 'libwebsockets-test-server', 'pkgver': '4.0.20-2ubuntu1.1+esm1', 'cves': ['CVE-2026-10650']},
    {'osver': '22.04', 'pkgname': 'libwebsockets-test-server-common', 'pkgver': '4.0.20-2ubuntu1.1+esm1', 'cves': ['CVE-2026-10650']},
    {'osver': '22.04', 'pkgname': 'libwebsockets16', 'pkgver': '4.0.20-2ubuntu1.1+esm1', 'cves': ['CVE-2026-10650']},
    {'osver': '24.04', 'pkgname': 'libwebsockets-evlib-ev', 'pkgver': '4.3.3-1.1ubuntu0.1~esm2', 'cves': ['CVE-2026-10650', 'CVE-2026-78161']},
    {'osver': '24.04', 'pkgname': 'libwebsockets-evlib-glib', 'pkgver': '4.3.3-1.1ubuntu0.1~esm2', 'cves': ['CVE-2026-10650', 'CVE-2026-78161']},
    {'osver': '24.04', 'pkgname': 'libwebsockets-evlib-uv', 'pkgver': '4.3.3-1.1ubuntu0.1~esm2', 'cves': ['CVE-2026-10650', 'CVE-2026-78161']},
    {'osver': '24.04', 'pkgname': 'libwebsockets-test-server', 'pkgver': '4.3.3-1.1ubuntu0.1~esm2', 'cves': ['CVE-2026-10650', 'CVE-2026-78161']},
    {'osver': '24.04', 'pkgname': 'libwebsockets-test-server-common', 'pkgver': '4.3.3-1.1ubuntu0.1~esm2', 'cves': ['CVE-2026-10650', 'CVE-2026-78161']},
    {'osver': '24.04', 'pkgname': 'libwebsockets19t64', 'pkgver': '4.3.3-1.1ubuntu0.1~esm2', 'cves': ['CVE-2026-10650', 'CVE-2026-78161']},
    {'osver': '26.04', 'pkgname': 'libwebsockets-evlib-ev', 'pkgver': '4.3.5-3ubuntu1.1', 'cves': ['CVE-2026-10650', 'CVE-2026-78161']},
    {'osver': '26.04', 'pkgname': 'libwebsockets-evlib-glib', 'pkgver': '4.3.5-3ubuntu1.1', 'cves': ['CVE-2026-10650', 'CVE-2026-78161']},
    {'osver': '26.04', 'pkgname': 'libwebsockets-evlib-uv', 'pkgver': '4.3.5-3ubuntu1.1', 'cves': ['CVE-2026-10650', 'CVE-2026-78161']},
    {'osver': '26.04', 'pkgname': 'libwebsockets-test-server', 'pkgver': '4.3.5-3ubuntu1.1', 'cves': ['CVE-2026-10650', 'CVE-2026-78161']},
    {'osver': '26.04', 'pkgname': 'libwebsockets-test-server-common', 'pkgver': '4.3.5-3ubuntu1.1', 'cves': ['CVE-2026-10650', 'CVE-2026-78161']},
    {'osver': '26.04', 'pkgname': 'libwebsockets19t64', 'pkgver': '4.3.5-3ubuntu1.1', 'cves': ['CVE-2026-10650', 'CVE-2026-78161']}
];

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

if (flag)
{
  var extra = '';
  extra += ubuntu_report_get();
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'libwebsockets-evlib-ev / libwebsockets-evlib-glib / etc');
}