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nessusUbuntu Security Notice (C) 2024 Canonical, Inc. / NASL script (C) 2024 and is owned by Tenable, Inc. or an Affiliate thereof.UBUNTU_USN-6538-2.NASL
HistoryJan 17, 2024 - 12:00 a.m.

Ubuntu 18.04 ESM : PostgreSQL vulnerabilities (USN-6538-2)

2024-01-1700:00:00
Ubuntu Security Notice (C) 2024 Canonical, Inc. / NASL script (C) 2024 and is owned by Tenable, Inc. or an Affiliate thereof.
www.tenable.com
9
ubuntu 18.04 esm
postgresql
vulnerabilities
remote access
sensitive information
arbitrary code execution
denial of service

8.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

8.6 High

AI Score

Confidence

High

0.015 Low

EPSS

Percentile

86.7%

The remote Ubuntu 18.04 ESM host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-6538-2 advisory.

  • A memory disclosure vulnerability was found in PostgreSQL that allows remote users to access sensitive information by exploiting certain aggregate function calls with ‘unknown’-type arguments. Handling ‘unknown’-type values from string literals without type designation can disclose bytes, potentially revealing notable and confidential information. This issue exists due to excessive data output in aggregate function calls, enabling remote users to read some portion of system memory. (CVE-2023-5868)

  • A flaw was found in PostgreSQL that allows authenticated database users to execute arbitrary code through missing overflow checks during SQL array value modification. This issue exists due to an integer overflow during array modification where a remote user can trigger the overflow by providing specially crafted data. This enables the execution of arbitrary code on the target system, allowing users to write arbitrary bytes to memory and extensively read the server’s memory. (CVE-2023-5869)

  • A flaw was found in PostgreSQL involving the pg_cancel_backend role that signals background workers, including the logical replication launcher, autovacuum workers, and the autovacuum launcher. Successful exploitation requires a non-core extension with a less-resilient background worker and would affect that specific background worker only. This issue may allow a remote high privileged user to launch a denial of service (DoS) attack. (CVE-2023-5870)

Note that Nessus has not tested for these issues but has instead relied only on the application’s self-reported version number.

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-6538-2. 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(189108);
  script_version("1.0");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/01/17");

  script_cve_id("CVE-2023-5868", "CVE-2023-5869", "CVE-2023-5870");
  script_xref(name:"USN", value:"6538-2");

  script_name(english:"Ubuntu 18.04 ESM : PostgreSQL vulnerabilities (USN-6538-2)");

  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 18.04 ESM host has packages installed that are affected by multiple vulnerabilities as referenced in
the USN-6538-2 advisory.

  - A memory disclosure vulnerability was found in PostgreSQL that allows remote users to access sensitive
    information by exploiting certain aggregate function calls with 'unknown'-type arguments. Handling
    'unknown'-type values from string literals without type designation can disclose bytes, potentially
    revealing notable and confidential information. This issue exists due to excessive data output in
    aggregate function calls, enabling remote users to read some portion of system memory. (CVE-2023-5868)

  - A flaw was found in PostgreSQL that allows authenticated database users to execute arbitrary code through
    missing overflow checks during SQL array value modification. This issue exists due to an integer overflow
    during array modification where a remote user can trigger the overflow by providing specially crafted
    data. This enables the execution of arbitrary code on the target system, allowing users to write arbitrary
    bytes to memory and extensively read the server's memory. (CVE-2023-5869)

  - A flaw was found in PostgreSQL involving the pg_cancel_backend role that signals background workers,
    including the logical replication launcher, autovacuum workers, and the autovacuum launcher. Successful
    exploitation requires a non-core extension with a less-resilient background worker and would affect that
    specific background worker only. This issue may allow a remote high privileged user to launch a denial of
    service (DoS) attack. (CVE-2023-5870)

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-6538-2");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/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-2023-5869");

  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:"2023/11/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2024/01/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2024/01/17");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:esm");
  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-client-10");
  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-plpython-10");
  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-pltcl-10");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:postgresql-server-dev-10");
  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 (! ('18.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 18.04', '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': '18.04', 'pkgname': 'libecpg-compat3', 'pkgver': '10.23-0ubuntu0.18.04.2+esm1'},
    {'osver': '18.04', 'pkgname': 'libecpg-dev', 'pkgver': '10.23-0ubuntu0.18.04.2+esm1'},
    {'osver': '18.04', 'pkgname': 'libecpg6', 'pkgver': '10.23-0ubuntu0.18.04.2+esm1'},
    {'osver': '18.04', 'pkgname': 'libpgtypes3', 'pkgver': '10.23-0ubuntu0.18.04.2+esm1'},
    {'osver': '18.04', 'pkgname': 'libpq-dev', 'pkgver': '10.23-0ubuntu0.18.04.2+esm1'},
    {'osver': '18.04', 'pkgname': 'libpq5', 'pkgver': '10.23-0ubuntu0.18.04.2+esm1'},
    {'osver': '18.04', 'pkgname': 'postgresql-10', 'pkgver': '10.23-0ubuntu0.18.04.2+esm1'},
    {'osver': '18.04', 'pkgname': 'postgresql-client-10', 'pkgver': '10.23-0ubuntu0.18.04.2+esm1'},
    {'osver': '18.04', 'pkgname': 'postgresql-plperl-10', 'pkgver': '10.23-0ubuntu0.18.04.2+esm1'},
    {'osver': '18.04', 'pkgname': 'postgresql-plpython-10', 'pkgver': '10.23-0ubuntu0.18.04.2+esm1'},
    {'osver': '18.04', 'pkgname': 'postgresql-plpython3-10', 'pkgver': '10.23-0ubuntu0.18.04.2+esm1'},
    {'osver': '18.04', 'pkgname': 'postgresql-pltcl-10', 'pkgver': '10.23-0ubuntu0.18.04.2+esm1'},
    {'osver': '18.04', 'pkgname': 'postgresql-server-dev-10', 'pkgver': '10.23-0ubuntu0.18.04.2+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_HOLE,
    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, 'libecpg-compat3 / libecpg-dev / libecpg6 / libpgtypes3 / libpq-dev / etc');
}
VendorProductVersionCPE
canonicalubuntu_linux18.04cpe:/o:canonical:ubuntu_linux:18.04:-:esm
canonicalubuntu_linuxlibecpg-compat3p-cpe:/a:canonical:ubuntu_linux:libecpg-compat3
canonicalubuntu_linuxlibecpg-devp-cpe:/a:canonical:ubuntu_linux:libecpg-dev
canonicalubuntu_linuxlibecpg6p-cpe:/a:canonical:ubuntu_linux:libecpg6
canonicalubuntu_linuxlibpgtypes3p-cpe:/a:canonical:ubuntu_linux:libpgtypes3
canonicalubuntu_linuxlibpq-devp-cpe:/a:canonical:ubuntu_linux:libpq-dev
canonicalubuntu_linuxlibpq5p-cpe:/a:canonical:ubuntu_linux:libpq5
canonicalubuntu_linuxpostgresql-10p-cpe:/a:canonical:ubuntu_linux:postgresql-10
canonicalubuntu_linuxpostgresql-client-10p-cpe:/a:canonical:ubuntu_linux:postgresql-client-10
canonicalubuntu_linuxpostgresql-plperl-10p-cpe:/a:canonical:ubuntu_linux:postgresql-plperl-10
Rows per page:
1-10 of 141

8.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

8.6 High

AI Score

Confidence

High

0.015 Low

EPSS

Percentile

86.7%