Debian dla-3930 : libsepol1 - 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-3930. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(209513);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/10/22");

  script_cve_id(
    "CVE-2021-36084",
    "CVE-2021-36085",
    "CVE-2021-36086",
    "CVE-2021-36087"
  );

  script_name(english:"Debian dla-3930 : libsepol1 - 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-3930 advisory.

    -------------------------------------------------------------------------
    Debian LTS Advisory DLA-3930-1                [email protected]
    https://www.debian.org/lts/security/                         Sean Whitton
    October 22, 2024                              https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : libsepol
    Version        : 3.1-1+deb11u1
    CVE ID         : CVE-2021-36084 CVE-2021-36085 CVE-2021-36086 CVE-2021-36087
    Debian Bug     : 990526

    Multiple vulnerabilities were discovered in libsepol, a set of userspace
    utilities and libraries for manipulating SELinux policies.

    CVE-2021-36084, CVE-2021-36085, CVE-2021-36086

        Three use-after-free problems were discovered in the CIL compiler.
        These could lead to data corruption, denial of service or possibly
        arbitrary code execution.

    CVE-2021-36087

        A heap-based buffer over-read was discovered in the CIL compiler.
        This could lead to confidentiality or integrity violations, or
        crashes.

    For Debian 11 bullseye, these problems have been fixed in version
    3.1-1+deb11u1.

    We recommend that you upgrade your libsepol packages.

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

    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.");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/source-package/libsepol");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2021-36084");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2021-36085");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2021-36086");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2021-36087");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bullseye/libsepol");
  script_set_attribute(attribute:"solution", value:
"Upgrade the libsepol1 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:L");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-36087");

  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:"2021/07/01");
  script_set_attribute(attribute:"patch_publication_date", value:"2024/10/22");
  script_set_attribute(attribute:"plugin_publication_date", value:"2024/10/22");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libsepol1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libsepol1-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:sepol-utils");
  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) 2024 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': 'libsepol1', 'reference': '3.1-1+deb11u1'},
    {'release': '11.0', 'prefix': 'libsepol1-dev', 'reference': '3.1-1+deb11u1'},
    {'release': '11.0', 'prefix': 'sepol-utils', 'reference': '3.1-1+deb11u1'}
];

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, 'libsepol1 / libsepol1-dev / sepol-utils');
}