Ubuntu 25.10 : CRaC JDK 17 vulnerabilities (USN-7997-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-7997-1. 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(297799);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/02/04");

  script_cve_id(
    "CVE-2026-21925",
    "CVE-2026-21932",
    "CVE-2026-21933",
    "CVE-2026-21945"
  );
  script_xref(name:"USN", value:"7997-1");

  script_name(english:"Ubuntu 25.10 : CRaC JDK 17 vulnerabilities (USN-7997-1)");

  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 25.10 host has packages installed that are affected by multiple vulnerabilities as referenced in the
USN-7997-1 advisory.

    It was discovered that the RMI component of CRaC JDK 17 would establish RMI TCP endpoint connections to a
    remote host without setting an endpoint identification algorithm. An unauthenticated remote attacker could
    possibly use this issue to steal sensitive information. (CVE-2026-21925)

    Mingijung discovered that the AWT and JavaFX componenets of CRaC JDK 17 could run programs if
    Desktop.browse() was supplied a filename as a URI. An unauthenticated remote attacker could possibly use
    this issue to execute arbitrary code. (CVE-2026-21932)

    Zhihui Chen discovered that the Networking component of CRaC JDK 17 was suceptible to a CRLF injection
    vulnerability via the HttpServer class. An unauthenticated remote attacker could possibly use this issue
    to modify files or leak sensitive information. (CVE-2026-21933)

    Ireneusz Pastusiak discovered that the Security component of CRaC JDK 17 failed to verify provided URIs
    point to a legitimate source when AIA is enabled. An unauthenticated remote attacker could possibly use
    this issue to redirect users to malicious hosts. (CVE-2026-21945)

    In addition to security fixes, the updated packages contain bug fixes, new features, and possibly
    incompatible changes.

    Please see the following for more information:
    https://openjdk.org/groups/vulnerability/advisories/2026-01-20

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-7997-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:C/A:N");
  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:L/I:L/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-21932");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2026-21925");

  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:"2026/01/20");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/02/02");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/02/04");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:25.10");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:openjdk-17-crac-demo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:openjdk-17-crac-jdk");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:openjdk-17-crac-jdk-headless");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:openjdk-17-crac-jre");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:openjdk-17-crac-jre-headless");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:openjdk-17-crac-jre-zero");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:openjdk-17-crac-source");
  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 (! ('25.10' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 25.10', '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': '25.10', 'pkgname': 'openjdk-17-crac-demo', 'pkgver': '17.0.18+8-0ubuntu1~25.10'},
    {'osver': '25.10', 'pkgname': 'openjdk-17-crac-jdk', 'pkgver': '17.0.18+8-0ubuntu1~25.10'},
    {'osver': '25.10', 'pkgname': 'openjdk-17-crac-jdk-headless', 'pkgver': '17.0.18+8-0ubuntu1~25.10'},
    {'osver': '25.10', 'pkgname': 'openjdk-17-crac-jre', 'pkgver': '17.0.18+8-0ubuntu1~25.10'},
    {'osver': '25.10', 'pkgname': 'openjdk-17-crac-jre-headless', 'pkgver': '17.0.18+8-0ubuntu1~25.10'},
    {'osver': '25.10', 'pkgname': 'openjdk-17-crac-jre-zero', 'pkgver': '17.0.18+8-0ubuntu1~25.10'},
    {'osver': '25.10', 'pkgname': 'openjdk-17-crac-source', 'pkgver': '17.0.18+8-0ubuntu1~25.10'}
];

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, 'openjdk-17-crac-demo / openjdk-17-crac-jdk / etc');
}