Ubuntu 20.04 LTS / 22.04 LTS / 24.04 LTS / 24.10 / 25.04 : Flask-CORS vulnerabilities (USN-7612-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-7612-1. 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(241350);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/07/04");

  script_cve_id(
    "CVE-2024-1681",
    "CVE-2024-6221",
    "CVE-2024-6839",
    "CVE-2024-6844",
    "CVE-2024-6866"
  );
  script_xref(name:"USN", value:"7612-1");

  script_name(english:"Ubuntu 20.04 LTS / 22.04 LTS / 24.04 LTS / 24.10 / 25.04 : Flask-CORS vulnerabilities (USN-7612-1)");

  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 / 24.10 / 25.04 host has a package installed that is affected by
multiple vulnerabilities as referenced in the USN-7612-1 advisory.

    It was discovered that Flask-CORS did not correctly handle certain regular expressions. A remote attacker
    could possibly use this issue to leak sensitive information or bypass authentication mechanisms.
    (CVE-2024-6839) It was discovered that Flask-CORS allowed certain CORS headers to be enabled by default. A
    remote attacker could possibly use this issue to leak sensitive information. This issue only affected
    Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS and Ubuntu 24.10. (CVE-2024-6221)

    It was discovered that Flask-CORS did not correctly handle case sensitivity when matching paths. A remote
    attacker could possibly use this issue to leak sensitive information. (CVE-2024-6866)

    It was discovered that Flask-CORS did not correctly handle certain characters in URL paths. A remote
    attacker could possibly use this issue to leak sensitive information or bypass authentication mechanisms.
    (CVE-2024-6844)

    Elias Hohl was discovered that Flask-CORS did not correctly sanitize log entries. A remote attacker could
    possibly use this issue to corrupt log files. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS
    and Ubuntu 24.04 LTS. (CVE-2024-1681)

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-7612-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected python3-flask-cors package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:N/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:H/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/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:H/VI:N/VA:N/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:P");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2024-6221");

  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:"2024/04/19");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/07/02");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/07/04");

  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:24.10");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:25.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3-flask-cors");
  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) 2025 Canonical, Inc. / NASL script (C) 2025 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl", "ubuntu_pro_sub_detect.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 || '24.10' >< os_release || '25.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 20.04 / 22.04 / 24.04 / 24.10 / 25.04', '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 ubuntu_pro_detected = get_kb_item('Host/Ubuntu/Pro/Services/esm-apps');
ubuntu_pro_detected = !empty_or_null(ubuntu_pro_detected);

var pro_caveat_needed = FALSE;

var pkgs = [
    {'osver': '20.04', 'pkgname': 'python3-flask-cors', 'pkgver': '3.0.8-2ubuntu0.1+esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2024-1681', 'CVE-2024-6221', 'CVE-2024-6844', 'CVE-2024-6866']},
    {'osver': '22.04', 'pkgname': 'python3-flask-cors', 'pkgver': '3.0.9-2ubuntu0.1', 'ubuntu_pro': FALSE, 'cves': ['CVE-2024-1681', 'CVE-2024-6221', 'CVE-2024-6844', 'CVE-2024-6866']},
    {'osver': '24.04', 'pkgname': 'python3-flask-cors', 'pkgver': '4.0.0-1ubuntu0.1~esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2024-1681', 'CVE-2024-6221', 'CVE-2024-6844', 'CVE-2024-6866']},
    {'osver': '24.10', 'pkgname': 'python3-flask-cors', 'pkgver': '4.0.1-1ubuntu0.1', 'ubuntu_pro': FALSE, 'cves': ['CVE-2024-6221', 'CVE-2024-6844', 'CVE-2024-6866']},
    {'osver': '25.04', 'pkgname': 'python3-flask-cors', 'pkgver': '5.0.0-1ubuntu0.1', 'ubuntu_pro': FALSE, 'cves': ['CVE-2024-6844', 'CVE-2024-6866']}
];

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

if (flag)
{
  var extra = '';
  if (pro_caveat_needed) {
    extra += 'NOTE: This vulnerability check contains fixes that apply to packages only \n';
    extra += 'available in Ubuntu ESM repositories. Access to these package security updates \n';
    extra += 'require an Ubuntu Pro subscription.\n\n';
  }
  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, 'python3-flask-cors');
}