Ubuntu 20.04 LTS / 22.04 LTS / 23.10 : NSS vulnerabilities (USN-6727-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-6727-1. 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(193171);
  script_version("1.0");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/04/10");

  script_cve_id("CVE-2023-4421", "CVE-2023-5388", "CVE-2023-6135");
  script_xref(name:"USN", value:"6727-1");

  script_name(english:"Ubuntu 20.04 LTS / 22.04 LTS / 23.10 : NSS vulnerabilities (USN-6727-1)");

  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 / 23.10 host has packages installed that are affected by multiple
vulnerabilities as referenced in the USN-6727-1 advisory.

  - The NSS code used for checking PKCS#1 v1.5 was leaking information useful in mounting Bleichenbacher-like
    attacks. Both the overall correctness of the padding as well as the length of the encrypted message was
    leaking through timing side-channel. By sending large number of attacker-selected ciphertexts, the
    attacker would be able to decrypt a previously intercepted PKCS#1 v1.5 ciphertext (for example, to decrypt
    a TLS session that used RSA key exchange), or forge a signature using the victim's key. The issue was
    fixed by implementing the implicit rejection algorithm, in which the NSS returns a deterministic random
    message in case invalid padding is detected, as proposed in the Marvin Attack paper. This vulnerability
    affects NSS < 3.61. (CVE-2023-4421)

  - NSS was susceptible to a timing side-channel attack when performing RSA decryption. This attack could
    potentially allow an attacker to recover the private data. This vulnerability affects Firefox < 124,
    Firefox ESR < 115.9, and Thunderbird < 115.9. (CVE-2023-5388)

  - Multiple NSS NIST curves were susceptible to a side-channel attack known as Minerva. This attack could
    potentially allow an attacker to recover the private key. This vulnerability affects Firefox < 121.
    (CVE-2023-6135)

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-6727-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected libnss3, libnss3-dev and / or libnss3-tools packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:C/I:N/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:L/PR:L/UI:N/S:U/C:H/I:N/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-2023-4421");

  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:"2023/10/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2024/04/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2024/04/10");

  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:23.10");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnss3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnss3-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnss3-tools");
  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) 2024 Canonical, Inc. / NASL script (C) 2024 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 || '23.10' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 20.04 / 22.04 / 23.10', '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': '20.04', 'pkgname': 'libnss3', 'pkgver': '2:3.98-0ubuntu0.20.04.1'},
    {'osver': '20.04', 'pkgname': 'libnss3-dev', 'pkgver': '2:3.98-0ubuntu0.20.04.1'},
    {'osver': '20.04', 'pkgname': 'libnss3-tools', 'pkgver': '2:3.98-0ubuntu0.20.04.1'},
    {'osver': '22.04', 'pkgname': 'libnss3', 'pkgver': '2:3.98-0ubuntu0.22.04.1'},
    {'osver': '22.04', 'pkgname': 'libnss3-dev', 'pkgver': '2:3.98-0ubuntu0.22.04.1'},
    {'osver': '22.04', 'pkgname': 'libnss3-tools', 'pkgver': '2:3.98-0ubuntu0.22.04.1'},
    {'osver': '23.10', 'pkgname': 'libnss3', 'pkgver': '2:3.98-0ubuntu0.23.10.1'},
    {'osver': '23.10', 'pkgname': 'libnss3-dev', 'pkgver': '2:3.98-0ubuntu0.23.10.1'},
    {'osver': '23.10', 'pkgname': 'libnss3-tools', 'pkgver': '2:3.98-0ubuntu0.23.10.1'}
];

var flag = 0;
foreach 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 (osver && pkgname && pkgver) {
    if (ubuntu_check(osver:osver, pkgname:pkgname, pkgver:pkgver)) flag++;
  }
}

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : ubuntu_report_get()
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'libnss3 / libnss3-dev / libnss3-tools');
}