Debian dla-4553 : gir1.2-polkit-1.0 - 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-4553. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(310957);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/29");

  script_cve_id("CVE-2021-4115", "CVE-2026-4897");

  script_name(english:"Debian dla-4553 : gir1.2-polkit-1.0 - 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-4553 advisory.

    -------------------------------------------------------------------------
    Debian LTS Advisory DLA-4553-1                [email protected]
    https://www.debian.org/lts/security/                   Andreas Henriksson
    April 29, 2026                                https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : policykit-1
    Version        : 0.105-31+deb11u2
    CVE ID         : CVE-2021-4115 CVE-2026-4897
    Debian Bug     : 1005784 1132234

    Multiple vulnerabilities where identified in polkit, a toolkit for defining
    and handling the policy that allows unprivileged processes to speak to
    privileged processes.

    CVE-2021-4115

      Kevin Backhouse of GitHub Security Lab (GHSL) found that there is a
      file descriptor leak in polkit, which can enable an unprivileged
      user to cause polkit to crash, due to file descriptor exhaustion.
      This could lead to currently ongoing authentication attempts to fail
      to authenticate resulting in a Denial of Service (DoS).

    CVE-2026-4897

      Pavel Kohout, Aisle Research found that a local user provide a specially
      crafted, excessively long input to the `polkit-agent-helper-1` setuid binary
      via standard input (stdin).
      This unbounded input can lead to an out-of-memory (OOM) condition,
      resulting in a Denial of Service (DoS) for the system.

    For Debian 11 bullseye, these problems have been fixed in version
    0.105-31+deb11u2.

    We recommend that you upgrade your policykit-1 packages.

    For the detailed security status of policykit-1 please refer to
    its security tracker page at:
    https://security-tracker.debian.org/tracker/policykit-1

    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/policykit-1
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?f1542d66");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2021-4115");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-4897");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bullseye/policykit-1");
  script_set_attribute(attribute:"solution", value:
"Upgrade the gir1.2-polkit-1.0 packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/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:L/AC:L/PR:L/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-2021-4115");

  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:"2022/02/03");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/04/29");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/04/29");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:gir1.2-polkit-1.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libpolkit-agent-1-0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libpolkit-agent-1-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libpolkit-gobject-1-0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libpolkit-gobject-1-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:policykit-1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:policykit-1-doc");
  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': 'gir1.2-polkit-1.0', 'reference': '0.105-31+deb11u2'},
    {'release': '11.0', 'prefix': 'libpolkit-agent-1-0', 'reference': '0.105-31+deb11u2'},
    {'release': '11.0', 'prefix': 'libpolkit-agent-1-dev', 'reference': '0.105-31+deb11u2'},
    {'release': '11.0', 'prefix': 'libpolkit-gobject-1-0', 'reference': '0.105-31+deb11u2'},
    {'release': '11.0', 'prefix': 'libpolkit-gobject-1-dev', 'reference': '0.105-31+deb11u2'},
    {'release': '11.0', 'prefix': 'policykit-1', 'reference': '0.105-31+deb11u2'},
    {'release': '11.0', 'prefix': 'policykit-1-doc', 'reference': '0.105-31+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_NOTE,
    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, 'gir1.2-polkit-1.0 / libpolkit-agent-1-0 / libpolkit-agent-1-dev / etc');
}