PostgreSQL 15.x < 15.4 Protection Mechanism Failure

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# Portions Copyright (C) 1996-2019, The PostgreSQL Global Development Group
# Portions Copyright (C) 1994, The Regents of the University of California
# Permission to use, copy, modify, and distribute this software and its documentation for any purpose, without fee, and without a written agreement is hereby granted, provided that the above copyright notice and this paragraph and the following two paragraphs appear in all copies.
# IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
# THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATIONS TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
##

include('compat.inc');

if (description)
{
  script_id(179921);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/11/16");

  script_cve_id("CVE-2023-39418");
  script_xref(name:"IAVB", value:"2023-B-0060-S");

  script_name(english:"PostgreSQL 15.x < 15.4 Protection Mechanism Failure");

  script_set_attribute(attribute:"synopsis", value:
"The remote database server is affected by a protection mechanism failure vulnerability");
  script_set_attribute(attribute:"description", value:
"The version of PostgreSQL installed on the remote host is 15 prior to 15.4. As such, it is potentially affected by a
vulnerability :

  - PostgreSQL 15 introduced the MERGE command, which fails to test new rows against row security policies
    defined for UPDATE and SELECT. If UPDATE and SELECT policies forbid some row that INSERT policies do not forbid, a
    user could store such rows. Subsequent consequences are application-dependent. This affects only databases
    that have used CREATE POLICY to define a row security policy.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  # https://www.postgresql.org/about/news/postgresql-154-149-1312-1216-1121-and-postgresql-16-beta-3-released-2689/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?88535bbe");
  script_set_attribute(attribute:"solution", value:
"Upgrade to PostgreSQL 15.4 or later");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:N/I:P/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:N/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-2023-39418");

  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:"2023/08/10");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/08/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/08/17");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:postgresql:postgresql");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Databases");

  script_copyright(english:"This script is Copyright (C) 2023 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("postgresql_version.nbin");
  script_require_ports("Services/postgresql", 5432);

  exit(0);
}

include('vcf.inc');
include('vcf_extras.inc');
include('backport.inc');

var port = get_service(svc:'postgresql', default:5432, exit_on_fail:TRUE);
var kb_base = 'database/' + port + '/postgresql/';

var kb_ver = kb_base + 'version';
get_kb_item_or_exit(kb_ver);

var kb_backport = NULL;
var source = get_kb_item_or_exit(kb_base + 'source');
get_backport_banner(banner:source);
if (backported) kb_backport = kb_base + 'backported';

var app_info = vcf::get_app_info(app:'PostgreSQL', port:port, kb_ver:kb_ver, kb_backport:kb_backport, service:TRUE);

var constraints = [
  { 'min_version' : '15', 'fixed_version' : '15.4' }
];

vcf::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_WARNING);