Ubuntu 22.04 LTS / 24.04 LTS / 25.04 : GnuTLS vulnerabilities (USN-7635-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-7635-1. 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(242198);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/07/16");

  script_cve_id(
    "CVE-2025-6395",
    "CVE-2025-32988",
    "CVE-2025-32989",
    "CVE-2025-32990"
  );
  script_xref(name:"USN", value:"7635-1");

  script_name(english:"Ubuntu 22.04 LTS / 24.04 LTS / 25.04 : GnuTLS vulnerabilities (USN-7635-1)");

  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 / 25.04 host has packages installed that are affected by multiple
vulnerabilities as referenced in the USN-7635-1 advisory.

    It was discovered that GnuTLS incorrectly handled exporting Subject Alternative Name (SAN) entries
    containing an otherName. A remote attacker could use this issue to cause GnuTLS to crash, resulting in a
    denial of service, or possibly execute arbitrary code. (CVE-2025-32988)

    It was discovered that GnuTLS incorrectly handled parsing the Certificate Transparency (CT) Signed
    Certificate Timestamp (SCT) extension. A remote attacker could use this issue to cause GnuTLS to crash,
    resulting in a denial of service, or possibly obtain sensitive information. (CVE-2025-32989)

    It was discovered that the GnuTLS certtool utility incorrectly handled parsing certain template files. An
    attacker could use this issue to cause GnuTLS to crash, resulting in a denial of service, or possibly
    execute arbitrary code. (CVE-2025-32990)

    Stefan Bhler discovered that GnuTLS incorrectly handled parsing certain template files. An attacker
    could possibly use this issue to cause GnuTLS to crash, resulting in a denial of service. (CVE-2025-6395)

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-7635-1");
  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: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:N/I:L/A:L");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2025-32990");

  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:"2025/07/10");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/07/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/07/16");

  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:"cpe:/o:canonical:ubuntu_linux:25.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:gnutls-bin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:guile-gnutls");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgnutls-dane0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgnutls-dane0t64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgnutls-openssl27");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgnutls-openssl27t64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgnutls28-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgnutls30");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgnutls30t64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgnutlsxx28");
  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");
  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 || '25.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 22.04 / 24.04 / 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 pkgs = [
    {'osver': '22.04', 'pkgname': 'gnutls-bin', 'pkgver': '3.7.3-4ubuntu1.7'},
    {'osver': '22.04', 'pkgname': 'guile-gnutls', 'pkgver': '3.7.3-4ubuntu1.7'},
    {'osver': '22.04', 'pkgname': 'libgnutls-dane0', 'pkgver': '3.7.3-4ubuntu1.7'},
    {'osver': '22.04', 'pkgname': 'libgnutls-openssl27', 'pkgver': '3.7.3-4ubuntu1.7'},
    {'osver': '22.04', 'pkgname': 'libgnutls28-dev', 'pkgver': '3.7.3-4ubuntu1.7'},
    {'osver': '22.04', 'pkgname': 'libgnutls30', 'pkgver': '3.7.3-4ubuntu1.7'},
    {'osver': '22.04', 'pkgname': 'libgnutlsxx28', 'pkgver': '3.7.3-4ubuntu1.7'},
    {'osver': '24.04', 'pkgname': 'gnutls-bin', 'pkgver': '3.8.3-1.1ubuntu3.4'},
    {'osver': '24.04', 'pkgname': 'libgnutls-dane0t64', 'pkgver': '3.8.3-1.1ubuntu3.4'},
    {'osver': '24.04', 'pkgname': 'libgnutls-openssl27t64', 'pkgver': '3.8.3-1.1ubuntu3.4'},
    {'osver': '24.04', 'pkgname': 'libgnutls28-dev', 'pkgver': '3.8.3-1.1ubuntu3.4'},
    {'osver': '24.04', 'pkgname': 'libgnutls30t64', 'pkgver': '3.8.3-1.1ubuntu3.4'},
    {'osver': '25.04', 'pkgname': 'gnutls-bin', 'pkgver': '3.8.9-2ubuntu3.1'},
    {'osver': '25.04', 'pkgname': 'libgnutls-dane0t64', 'pkgver': '3.8.9-2ubuntu3.1'},
    {'osver': '25.04', 'pkgname': 'libgnutls-openssl27t64', 'pkgver': '3.8.9-2ubuntu3.1'},
    {'osver': '25.04', 'pkgname': 'libgnutls28-dev', 'pkgver': '3.8.9-2ubuntu3.1'},
    {'osver': '25.04', 'pkgname': 'libgnutls30t64', 'pkgver': '3.8.9-2ubuntu3.1'}
];

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_WARNING,
    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, 'gnutls-bin / guile-gnutls / libgnutls-dane0 / libgnutls-dane0t64 / etc');
}