Debian dla-4524 : libecpg-compat3 - security update

#%NASL_MIN_LEVEL 80900
#
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory dla-4524. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(307674);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/15");

  script_cve_id(
    "CVE-2026-2003",
    "CVE-2026-2004",
    "CVE-2026-2005",
    "CVE-2026-2006"
  );

  script_name(english:"Debian dla-4524 : libecpg-compat3 - security update");

  script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing one or more security-related updates.");
  script_set_attribute(attribute:"description", value:
"The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the
dla-4524 advisory.

    -------------------------------------------------------------------------
    Debian LTS Advisory DLA-4524-1                [email protected]
    https://www.debian.org/lts/security/                   Jochen Sprickerhof
    April 08, 2026                                https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : postgresql-13
    Version        : 13.23-0+deb11u2
    CVE ID         : CVE-2026-2003 CVE-2026-2004 CVE-2026-2005 CVE-2026-2006
    Debian Bug     :

    Multiple vulnerabilities were fixed in PostgreSQL, a popular database.

    CVE-2026-2003

        Fix CVE-2026-2003: Improper validation of type oidvector in PostgreSQL
        allows a database user to disclose a few bytes of server memory. We have
        not ruled out viability of attacks that arrange for presence of
        confidential information in disclosed bytes, but they seem unlikely.

    CVE-2026-2004

        Fix CVE-2026-2004: Missing validation of type of input in PostgreSQL
        intarray extension selectivity estimator function allows an object creator
        to execute arbitrary code as the operating system user running the
        database.

    CVE-2026-2005

        Fix CVE-2026-2005: Heap buffer overflow in PostgreSQL pgcrypto allows a
        ciphertext provider to execute arbitrary code as the operating system user
        running the database.

    CVE-2026-2006

        Fix CVE-2026-2006: Missing validation of multibyte character length in
        PostgreSQL text manipulation allows a database user to issue crafted
        queries that achieve a buffer overrun. That suffices to execute arbitrary
        code as the operating system user running the database.

    For Debian 11 bullseye, these problems have been fixed in version
    13.23-0+deb11u2.

    We recommend that you upgrade your postgresql-13 packages.

    For the detailed security status of postgresql-13 please refer to
    its security tracker page at:
    https://security-tracker.debian.org/tracker/postgresql-13

    Further information about Debian LTS security advisories, how to apply
    these updates to your system and frequently asked questions can be
    found at: https://wiki.debian.org/LTS
    Attachment:
    signature.asc
    Description: PGP signature

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  # https://security-tracker.debian.org/tracker/source-package/postgresql-13
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?1964ded4");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-2003");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-2004");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-2005");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-2006");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bullseye/postgresql-13");
  script_set_attribute(attribute:"solution", value:
"Upgrade the libecpg-compat3 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:POC/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:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-2006");

  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:"2026/02/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/04/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/04/21");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libecpg-compat3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libecpg-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libecpg6");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libpgtypes3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libpq-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libpq5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:postgresql-13");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:postgresql-client-13");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:postgresql-doc-13");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:postgresql-plperl-13");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:postgresql-plpython3-13");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:postgresql-pltcl-13");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:postgresql-server-dev-13");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:11.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Debian/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);
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);

var debian_release = get_kb_item('Host/Debian/release');
if ( isnull(debian_release) ) audit(AUDIT_OS_NOT, 'Debian');
debian_release = chomp(debian_release);
if (! preg(pattern:"^(11)\.[0-9]+", string:debian_release)) audit(AUDIT_OS_NOT, 'Debian 11.0', 'Debian ' + debian_release);
var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Debian', cpu);

var pkgs = [
    {'release': '11.0', 'prefix': 'libecpg-compat3', 'reference': '13.23-0+deb11u2'},
    {'release': '11.0', 'prefix': 'libecpg-dev', 'reference': '13.23-0+deb11u2'},
    {'release': '11.0', 'prefix': 'libecpg6', 'reference': '13.23-0+deb11u2'},
    {'release': '11.0', 'prefix': 'libpgtypes3', 'reference': '13.23-0+deb11u2'},
    {'release': '11.0', 'prefix': 'libpq-dev', 'reference': '13.23-0+deb11u2'},
    {'release': '11.0', 'prefix': 'libpq5', 'reference': '13.23-0+deb11u2'},
    {'release': '11.0', 'prefix': 'postgresql-13', 'reference': '13.23-0+deb11u2'},
    {'release': '11.0', 'prefix': 'postgresql-client-13', 'reference': '13.23-0+deb11u2'},
    {'release': '11.0', 'prefix': 'postgresql-doc-13', 'reference': '13.23-0+deb11u2'},
    {'release': '11.0', 'prefix': 'postgresql-plperl-13', 'reference': '13.23-0+deb11u2'},
    {'release': '11.0', 'prefix': 'postgresql-plpython3-13', 'reference': '13.23-0+deb11u2'},
    {'release': '11.0', 'prefix': 'postgresql-pltcl-13', 'reference': '13.23-0+deb11u2'},
    {'release': '11.0', 'prefix': 'postgresql-server-dev-13', 'reference': '13.23-0+deb11u2'}
];

var flag = 0;
foreach package_array ( pkgs ) {
  var _release = NULL;
  var prefix = NULL;
  var reference = NULL;
  if (!empty_or_null(package_array['release'])) _release = package_array['release'];
  if (!empty_or_null(package_array['prefix'])) prefix = package_array['prefix'];
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (_release && prefix && reference) {
    if (deb_check(release:_release, prefix:prefix, reference:reference)) flag++;
  }
}

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : deb_report_get()
  );
  exit(0);
}
else
{
  var tested = deb_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');
}