Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : PostgreSQL vulnerabilities (USN-4633-1)

##
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-4633-1. The text
# itself is copyright (C) Canonical, Inc. See
# <http://www.ubuntu.com/usn/>. Ubuntu(R) is a registered
# trademark of Canonical, Inc.
##

include('compat.inc');

if (description)
{
  script_id(142968);
  script_version("1.10");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/08/29");

  script_cve_id("CVE-2020-25694", "CVE-2020-25695", "CVE-2020-25696");
  script_xref(name:"USN", value:"4633-1");
  script_xref(name:"IAVB", value:"2020-B-0069-S");

  script_name(english:"Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : PostgreSQL vulnerabilities (USN-4633-1)");

  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 / 20.04 LTS host has packages installed that are affected by multiple
vulnerabilities as referenced in the USN-4633-1 advisory.

    Peter Eisentraut discovered that PostgreSQL incorrectly handled connection security settings. Client
    applications could possibly be connecting with certain security parameters dropped, contrary to
    expectations. (CVE-2020-25694)

    Etienne Stalmans discovered that PostgreSQL incorrectly handled the security restricted operation sandbox.
    An authenticated remote attacker could possibly use this issue to execute arbitrary SQL functions as a
    superuser. (CVE-2020-25695)

    Nick Cleaton discovered that PostgreSQL incorrectly handled the \gset meta-command. A remote attacker with
    a compromised server could possibly use this issue to execute arbitrary code. (CVE-2020-25696)

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-4633-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:H/Au:N/C:C/I:C/A:C");
  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:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-25696");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2020-25695");

  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:"2020/11/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/11/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/11/17");

  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:20.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libecpg-compat3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libecpg-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libecpg6");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpgtypes3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpq-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpq5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:postgresql-10");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:postgresql-12");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:postgresql-9.5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:postgresql-client-10");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:postgresql-client-12");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:postgresql-client-9.5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:postgresql-contrib-9.5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:postgresql-plperl-10");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:postgresql-plperl-12");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:postgresql-plperl-9.5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:postgresql-plpython-10");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:postgresql-plpython-9.5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:postgresql-plpython3-10");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:postgresql-plpython3-12");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:postgresql-plpython3-9.5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:postgresql-pltcl-10");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:postgresql-pltcl-12");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:postgresql-pltcl-9.5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:postgresql-server-dev-10");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:postgresql-server-dev-12");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:postgresql-server-dev-9.5");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Ubuntu Local Security Checks");

  script_copyright(english:"Ubuntu Security Notice (C) 2020-2024 Canonical, Inc. / NASL script (C) 2020-2024 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 || '20.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 16.04 / 18.04 / 20.04', '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': 'libecpg-compat3', 'pkgver': '9.5.24-0ubuntu0.16.04.1'},
    {'osver': '16.04', 'pkgname': 'libecpg-dev', 'pkgver': '9.5.24-0ubuntu0.16.04.1'},
    {'osver': '16.04', 'pkgname': 'libecpg6', 'pkgver': '9.5.24-0ubuntu0.16.04.1'},
    {'osver': '16.04', 'pkgname': 'libpgtypes3', 'pkgver': '9.5.24-0ubuntu0.16.04.1'},
    {'osver': '16.04', 'pkgname': 'libpq-dev', 'pkgver': '9.5.24-0ubuntu0.16.04.1'},
    {'osver': '16.04', 'pkgname': 'libpq5', 'pkgver': '9.5.24-0ubuntu0.16.04.1'},
    {'osver': '16.04', 'pkgname': 'postgresql-9.5', 'pkgver': '9.5.24-0ubuntu0.16.04.1'},
    {'osver': '16.04', 'pkgname': 'postgresql-client-9.5', 'pkgver': '9.5.24-0ubuntu0.16.04.1'},
    {'osver': '16.04', 'pkgname': 'postgresql-contrib-9.5', 'pkgver': '9.5.24-0ubuntu0.16.04.1'},
    {'osver': '16.04', 'pkgname': 'postgresql-plperl-9.5', 'pkgver': '9.5.24-0ubuntu0.16.04.1'},
    {'osver': '16.04', 'pkgname': 'postgresql-plpython-9.5', 'pkgver': '9.5.24-0ubuntu0.16.04.1'},
    {'osver': '16.04', 'pkgname': 'postgresql-plpython3-9.5', 'pkgver': '9.5.24-0ubuntu0.16.04.1'},
    {'osver': '16.04', 'pkgname': 'postgresql-pltcl-9.5', 'pkgver': '9.5.24-0ubuntu0.16.04.1'},
    {'osver': '16.04', 'pkgname': 'postgresql-server-dev-9.5', 'pkgver': '9.5.24-0ubuntu0.16.04.1'},
    {'osver': '18.04', 'pkgname': 'libecpg-compat3', 'pkgver': '10.15-0ubuntu0.18.04.1'},
    {'osver': '18.04', 'pkgname': 'libecpg-dev', 'pkgver': '10.15-0ubuntu0.18.04.1'},
    {'osver': '18.04', 'pkgname': 'libecpg6', 'pkgver': '10.15-0ubuntu0.18.04.1'},
    {'osver': '18.04', 'pkgname': 'libpgtypes3', 'pkgver': '10.15-0ubuntu0.18.04.1'},
    {'osver': '18.04', 'pkgname': 'libpq-dev', 'pkgver': '10.15-0ubuntu0.18.04.1'},
    {'osver': '18.04', 'pkgname': 'libpq5', 'pkgver': '10.15-0ubuntu0.18.04.1'},
    {'osver': '18.04', 'pkgname': 'postgresql-10', 'pkgver': '10.15-0ubuntu0.18.04.1'},
    {'osver': '18.04', 'pkgname': 'postgresql-client-10', 'pkgver': '10.15-0ubuntu0.18.04.1'},
    {'osver': '18.04', 'pkgname': 'postgresql-plperl-10', 'pkgver': '10.15-0ubuntu0.18.04.1'},
    {'osver': '18.04', 'pkgname': 'postgresql-plpython-10', 'pkgver': '10.15-0ubuntu0.18.04.1'},
    {'osver': '18.04', 'pkgname': 'postgresql-plpython3-10', 'pkgver': '10.15-0ubuntu0.18.04.1'},
    {'osver': '18.04', 'pkgname': 'postgresql-pltcl-10', 'pkgver': '10.15-0ubuntu0.18.04.1'},
    {'osver': '18.04', 'pkgname': 'postgresql-server-dev-10', 'pkgver': '10.15-0ubuntu0.18.04.1'},
    {'osver': '20.04', 'pkgname': 'libecpg-compat3', 'pkgver': '12.5-0ubuntu0.20.04.1'},
    {'osver': '20.04', 'pkgname': 'libecpg-dev', 'pkgver': '12.5-0ubuntu0.20.04.1'},
    {'osver': '20.04', 'pkgname': 'libecpg6', 'pkgver': '12.5-0ubuntu0.20.04.1'},
    {'osver': '20.04', 'pkgname': 'libpgtypes3', 'pkgver': '12.5-0ubuntu0.20.04.1'},
    {'osver': '20.04', 'pkgname': 'libpq-dev', 'pkgver': '12.5-0ubuntu0.20.04.1'},
    {'osver': '20.04', 'pkgname': 'libpq5', 'pkgver': '12.5-0ubuntu0.20.04.1'},
    {'osver': '20.04', 'pkgname': 'postgresql-12', 'pkgver': '12.5-0ubuntu0.20.04.1'},
    {'osver': '20.04', 'pkgname': 'postgresql-client-12', 'pkgver': '12.5-0ubuntu0.20.04.1'},
    {'osver': '20.04', 'pkgname': 'postgresql-plperl-12', 'pkgver': '12.5-0ubuntu0.20.04.1'},
    {'osver': '20.04', 'pkgname': 'postgresql-plpython3-12', 'pkgver': '12.5-0ubuntu0.20.04.1'},
    {'osver': '20.04', 'pkgname': 'postgresql-pltcl-12', 'pkgver': '12.5-0ubuntu0.20.04.1'},
    {'osver': '20.04', 'pkgname': 'postgresql-server-dev-12', 'pkgver': '12.5-0ubuntu0.20.04.1'}
];

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 (osver && pkgname && pkgver) {
    if (ubuntu_check(osver:osver, pkgname:pkgname, pkgver:pkgver)) 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, 'libecpg-compat3 / libecpg-dev / libecpg6 / libpgtypes3 / libpq-dev / etc');
}