Ubuntu 16.04 LTS / 18.04 LTS / 22.04 LTS : UltraJSON vulnerabilities (USN-6629-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-6629-1. 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(190410);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/02/15");

  script_cve_id("CVE-2021-45958", "CVE-2022-31116", "CVE-2022-31117");
  script_xref(name:"USN", value:"6629-1");

  script_name(english:"Ubuntu 16.04 LTS / 18.04 LTS / 22.04 LTS : UltraJSON vulnerabilities (USN-6629-1)");

  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 16.04 LTS / 18.04 LTS / 22.04 LTS host has packages installed that are affected by multiple
vulnerabilities as referenced in the USN-6629-1 advisory.

  - UltraJSON (aka ujson) through 5.1.0 has a stack-based buffer overflow in Buffer_AppendIndentUnchecked
    (called from encode). Exploitation can, for example, use a large amount of indentation. (CVE-2021-45958)

  - UltraJSON is a fast JSON encoder and decoder written in pure C with bindings for Python 3.7+. Affected
    versions were found to improperly decode certain characters. JSON strings that contain escaped surrogate
    characters not part of a proper surrogate pair were decoded incorrectly. Besides corrupting strings, this
    allowed for potential key confusion and value overwriting in dictionaries. All users parsing JSON from
    untrusted sources are vulnerable. From version 5.4.0, UltraJSON decodes lone surrogates in the same way as
    the standard library's `json` module does, preserving them in the parsed output. Users are advised to
    upgrade. There are no known workarounds for this issue. (CVE-2022-31116)

  - UltraJSON is a fast JSON encoder and decoder written in pure C with bindings for Python 3.7+. In versions
    prior to 5.4.0 an error occurring while reallocating a buffer for string decoding can cause the buffer to
    get freed twice. Due to how UltraJSON uses the internal decoder, this double free is impossible to trigger
    from Python. This issue has been resolved in version 5.4.0 and all users should upgrade to UltraJSON
    5.4.0. There are no known workarounds for this issue. (CVE-2022-31117)

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-6629-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected python-ujson and / or python3-ujson packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  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:N/I:N/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-2022-31116");

  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:"2022/01/01");
  script_set_attribute(attribute:"patch_publication_date", value:"2024/02/12");
  script_set_attribute(attribute:"plugin_publication_date", value:"2024/02/12");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:22.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python-ujson");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3-ujson");
  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 (! ('16.04' >< os_release || '18.04' >< os_release || '22.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 16.04 / 18.04 / 22.04', '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': '16.04', 'pkgname': 'python-ujson', 'pkgver': '1.33-1ubuntu0.1~esm2'},
    {'osver': '16.04', 'pkgname': 'python3-ujson', 'pkgver': '1.33-1ubuntu0.1~esm2'},
    {'osver': '18.04', 'pkgname': 'python-ujson', 'pkgver': '1.35-2ubuntu0.1~esm1'},
    {'osver': '18.04', 'pkgname': 'python3-ujson', 'pkgver': '1.35-2ubuntu0.1~esm1'},
    {'osver': '22.04', 'pkgname': 'python3-ujson', 'pkgver': '5.1.0-1ubuntu0.1~esm1'}
];

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, 'python-ujson / python3-ujson');
}