Debian DSA-4994-1 : bind9 - security update

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory dsa-4994. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(154707);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/02/17");

  script_cve_id("CVE-2021-25219");
  script_xref(name:"IAVA", value:"2021-A-0525-S");

  script_name(english:"Debian DSA-4994-1 : bind9 - 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 10 / 11 host has packages installed that are affected by a vulnerability as referenced in the dsa-4994
advisory.

  - In BIND 9.3.0 -> 9.11.35, 9.12.0 -> 9.16.21, and versions 9.9.3-S1 -> 9.11.35-S1 and 9.16.8-S1 ->
    9.16.21-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -> 9.17.18 of the BIND
    9.17 development branch, exploitation of broken authoritative servers using a flaw in response processing
    can cause degradation in BIND resolver performance. The way the lame cache is currently designed makes it
    possible for its internal data structures to grow almost infinitely, which may cause significant delays in
    client query processing. (CVE-2021-25219)

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/bind9");
  script_set_attribute(attribute:"see_also", value:"https://www.debian.org/security/2021/dsa-4994");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2021-25219");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/buster/bind9");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bullseye/bind9");
  script_set_attribute(attribute:"solution", value:
"Upgrade the bind9 packages.

For the stable distribution (bullseye), this problem has been fixed in version 1");
  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-2021-25219");

  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:"2021/10/27");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/10/28");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/10/28");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:bind9");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:bind9-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:bind9-dnsutils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:bind9-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:bind9-host");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:bind9-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:bind9-utils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:bind9utils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dnsutils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libbind-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libbind-export-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libbind9-161");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libdns-export1104");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libdns1104");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libirs-export161");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libirs161");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libisc-export1100");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libisc1100");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libisccc-export161");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libisccc161");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libisccfg-export163");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libisccfg163");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:liblwres161");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:10.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:11.0");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2021-2023 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('audit.inc');
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 release = get_kb_item('Host/Debian/release');
if ( isnull(release) ) audit(AUDIT_OS_NOT, 'Debian');
release = chomp(release);
if (! preg(pattern:"^(10)\.[0-9]+|^(11)\.[0-9]+", string:release)) audit(AUDIT_OS_NOT, 'Debian 10.0 / 11.0', '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': '10.0', 'prefix': 'bind9', 'reference': '1:9.11.5.P4+dfsg-5.1+deb10u6'},
    {'release': '10.0', 'prefix': 'bind9-doc', 'reference': '1:9.11.5.P4+dfsg-5.1+deb10u6'},
    {'release': '10.0', 'prefix': 'bind9-host', 'reference': '1:9.11.5.P4+dfsg-5.1+deb10u6'},
    {'release': '10.0', 'prefix': 'bind9utils', 'reference': '1:9.11.5.P4+dfsg-5.1+deb10u6'},
    {'release': '10.0', 'prefix': 'dnsutils', 'reference': '1:9.11.5.P4+dfsg-5.1+deb10u6'},
    {'release': '10.0', 'prefix': 'libbind-dev', 'reference': '1:9.11.5.P4+dfsg-5.1+deb10u6'},
    {'release': '10.0', 'prefix': 'libbind-export-dev', 'reference': '1:9.11.5.P4+dfsg-5.1+deb10u6'},
    {'release': '10.0', 'prefix': 'libbind9-161', 'reference': '1:9.11.5.P4+dfsg-5.1+deb10u6'},
    {'release': '10.0', 'prefix': 'libdns-export1104', 'reference': '1:9.11.5.P4+dfsg-5.1+deb10u6'},
    {'release': '10.0', 'prefix': 'libdns1104', 'reference': '1:9.11.5.P4+dfsg-5.1+deb10u6'},
    {'release': '10.0', 'prefix': 'libirs-export161', 'reference': '1:9.11.5.P4+dfsg-5.1+deb10u6'},
    {'release': '10.0', 'prefix': 'libirs161', 'reference': '1:9.11.5.P4+dfsg-5.1+deb10u6'},
    {'release': '10.0', 'prefix': 'libisc-export1100', 'reference': '1:9.11.5.P4+dfsg-5.1+deb10u6'},
    {'release': '10.0', 'prefix': 'libisc1100', 'reference': '1:9.11.5.P4+dfsg-5.1+deb10u6'},
    {'release': '10.0', 'prefix': 'libisccc-export161', 'reference': '1:9.11.5.P4+dfsg-5.1+deb10u6'},
    {'release': '10.0', 'prefix': 'libisccc161', 'reference': '1:9.11.5.P4+dfsg-5.1+deb10u6'},
    {'release': '10.0', 'prefix': 'libisccfg-export163', 'reference': '1:9.11.5.P4+dfsg-5.1+deb10u6'},
    {'release': '10.0', 'prefix': 'libisccfg163', 'reference': '1:9.11.5.P4+dfsg-5.1+deb10u6'},
    {'release': '10.0', 'prefix': 'liblwres161', 'reference': '1:9.11.5.P4+dfsg-5.1+deb10u6'},
    {'release': '11.0', 'prefix': 'bind9', 'reference': '1:9.16.22-1~deb11u1'},
    {'release': '11.0', 'prefix': 'bind9-dev', 'reference': '1:9.16.22-1~deb11u1'},
    {'release': '11.0', 'prefix': 'bind9-dnsutils', 'reference': '1:9.16.22-1~deb11u1'},
    {'release': '11.0', 'prefix': 'bind9-doc', 'reference': '1:9.16.22-1~deb11u1'},
    {'release': '11.0', 'prefix': 'bind9-host', 'reference': '1:9.16.22-1~deb11u1'},
    {'release': '11.0', 'prefix': 'bind9-libs', 'reference': '1:9.16.22-1~deb11u1'},
    {'release': '11.0', 'prefix': 'bind9-utils', 'reference': '1:9.16.22-1~deb11u1'},
    {'release': '11.0', 'prefix': 'bind9utils', 'reference': '1:9.16.22-1~deb11u1'},
    {'release': '11.0', 'prefix': 'dnsutils', 'reference': '1:9.16.22-1~deb11u1'},
];

var flag = 0;
foreach package_array ( pkgs ) {
  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, 'bind9 / bind9-dev / bind9-dnsutils / bind9-doc / bind9-host / etc');
}