Ubuntu 22.04 LTS / 24.04 LTS : Authlib vulnerabilities (USN-8065-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-8065-1. 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(300274);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/03/02");

  script_cve_id(
    "CVE-2024-37568",
    "CVE-2025-59420",
    "CVE-2025-61920",
    "CVE-2025-62706",
    "CVE-2025-68158"
  );
  script_xref(name:"USN", value:"8065-1");

  script_name(english:"Ubuntu 22.04 LTS / 24.04 LTS : Authlib vulnerabilities (USN-8065-1)");

  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 22.04 LTS / 24.04 LTS host has a package installed that is affected by multiple vulnerabilities as
referenced in the USN-8065-1 advisory.

    Millie Solem discovered that Authlib did not properly restrict algorithm selection during JWT
    verification, allowing HMAC verification with asymmetric public keys when no algorithm was specified. A
    remote attacker could possibly use this issue to bypass signature verification and forge tokens, resulting
    in authentication bypass or privilege escalation. (CVE-2024-37568)

    Muhammad Noman Ilyas discovered that Authlib did not properly enforce critical header parameter handling
    during JSON Web Signature verification, leading to unknown critical parameters being incorrectly accepted.
    A remote attacker could possibly use this issue to bypass security policies in mixed deployments,
    resulting in authentication bypass, replay attacks, or privilege escalation. (CVE-2025-59420)

    Muhammad Noman Ilyas discovered that Authlib did not properly limit the size of JSON Web Signature or JSON
    Web Token header and signature segments. A remote attacker could possibly use this issue to cause
    excessive memory or processor consumption, leading to a denial of service. (CVE-2025-61920)

    Muhammad Noman Ilyas discovered that Authlib performed unbounded decompression when processing certain
    compressed encrypted tokens. A remote attacker could possibly use this issue to send a specially crafted
    token that can be expanded to a large size during decompression, causing a denial of service.
    (CVE-2025-62706)

    It was discovered that Authlib did not properly bind cached state information to the initiating user
    session during OAuth authentication flows. A remote attacker could possibly use this issue to perform
    cross- site request forgery attacks, resulting in unauthorized actions or authentication bypass. This
    issue only affected Ubuntu 24.04 LTS. (CVE-2025-68158)

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-8065-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected python3-authlib package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  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:R/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2025-68158");

  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:"2024/06/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/02/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/03/02");

  script_set_attribute(attribute:"plugin_type", value:"local");
  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:"p-cpe:/a:canonical:ubuntu_linux:python3-authlib");
  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", "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 (! ('22.04' >< os_release || '24.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 22.04 / 24.04', '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': '22.04', 'pkgname': 'python3-authlib', 'pkgver': '0.15.5-1ubuntu0.1~esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2024-37568', 'CVE-2025-59420', 'CVE-2025-61920', 'CVE-2025-62706']},
    {'osver': '24.04', 'pkgname': 'python3-authlib', 'pkgver': '1.3.0-1ubuntu0.1~esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2024-37568', 'CVE-2025-59420', 'CVE-2025-61920', 'CVE-2025-62706', 'CVE-2025-68158']}
];

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-authlib');
}