Debian dla-3952 : libunbound-dev - 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-3952. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(211384);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/11/14");

  script_cve_id("CVE-2024-8508");
  script_xref(name:"IAVA", value:"2024-A-0682");

  script_name(english:"Debian dla-3952 : libunbound-dev - security update");

  script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing a security-related update.");
  script_set_attribute(attribute:"description", value:
"The remote Debian 11 host has packages installed that are affected by a vulnerability as referenced in the dla-3952
advisory.

    -------------------------------------------------------------------------
    Debian LTS Advisory DLA-3952-1                [email protected]
    https://www.debian.org/lts/security/                       Daniel Leidert
    November 14, 2024                             https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : unbound
    Version        : 1.13.1-1+deb11u4
    CVE ID         : CVE-2024-8508
    Debian Bug     : 1083282

    A vulnerability has been discovered in unbound, a validating,
    recursive, caching DNS resolver. Malicious upstreams responses with
    very large RRsets can cause Unbound to spend a considerable time
    applying name compression to downstream replies. This can lead to
    degraded performance and eventually denial of service in well
    orchestrated attacks. The vulnerability can be exploited by a malicious
    actor querying Unbound for the specially crafted contents of a
    malicious zone with very large RRsets.

    For Debian 11 bullseye, this problem has been fixed in version
    1.13.1-1+deb11u4.

    We recommend that you upgrade your unbound packages.

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

    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: This is a digitally signed message part

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

Note that Nessus has not tested for this issue 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/unbound");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2024-8508");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bullseye/unbound");
  script_set_attribute(attribute:"solution", value:
"Upgrade the libunbound-dev packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  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:N/UI:N/S:U/C:N/I:N/A:L");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2024-8508");

  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:"2024/10/03");
  script_set_attribute(attribute:"patch_publication_date", value:"2024/11/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2024/11/14");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libunbound-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libunbound8");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:python3-unbound");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:unbound");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:unbound-anchor");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:unbound-host");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:11.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"II");
  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': 'libunbound-dev', 'reference': '1.13.1-1+deb11u4'},
    {'release': '11.0', 'prefix': 'libunbound8', 'reference': '1.13.1-1+deb11u4'},
    {'release': '11.0', 'prefix': 'python3-unbound', 'reference': '1.13.1-1+deb11u4'},
    {'release': '11.0', 'prefix': 'unbound', 'reference': '1.13.1-1+deb11u4'},
    {'release': '11.0', 'prefix': 'unbound-anchor', 'reference': '1.13.1-1+deb11u4'},
    {'release': '11.0', 'prefix': 'unbound-host', 'reference': '1.13.1-1+deb11u4'}
];

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_WARNING,
    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, 'libunbound-dev / libunbound8 / python3-unbound / unbound / etc');
}