Debian DLA-2852-1 : apache-log4j2 - LTS 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 dla-2852. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

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

if (description)
{
  script_id(156396);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/12/05");

  script_cve_id("CVE-2020-9488", "CVE-2021-45105");
  script_xref(name:"IAVA", value:"2020-A-0324");
  script_xref(name:"IAVA", value:"2021-A-0035-S");
  script_xref(name:"IAVA", value:"2020-A-0196-S");
  script_xref(name:"IAVA", value:"2021-A-0573");
  script_xref(name:"CEA-ID", value:"CEA-2021-0004");
  script_xref(name:"CEA-ID", value:"CEA-2021-0025");

  script_name(english:"Debian DLA-2852-1 : apache-log4j2 - LTS 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 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the
dla-2852 advisory.

  - Improper validation of certificate with host mismatch in Apache Log4j SMTP appender. This could allow an
    SMTPS connection to be intercepted by a man-in-the-middle attack which could leak any log messages sent
    through that appender. (CVE-2020-9488)

  - Apache Log4j2 versions 2.0-alpha1 through 2.16.0 (excluding 2.12.3) did not protect from uncontrolled
    recursion from self-referential lookups. This allows an attacker with control over Thread Context Map data
    to cause a denial of service when a crafted string is interpreted. This issue was fixed in Log4j 2.17.0
    and 2.12.3. (CVE-2021-45105)

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://bugs.debian.org/cgi-bin/bugreport.cgi?bug=959450");
  # https://security-tracker.debian.org/tracker/source-package/apache-log4j2
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?a7f9f2b8");
  script_set_attribute(attribute:"see_also", value:"https://www.debian.org/lts/security/2021/dla-2852");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2020-9488");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2021-45105");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/stretch/apache-log4j2");
  script_set_attribute(attribute:"solution", value:
"Upgrade the apache-log4j2 packages.

For Debian 9 stretch, these problems have been fixed in version 2.12.3-0+deb9u1.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:H/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:H/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-9488");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"exploited_by_malware", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/04/27");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/12/26");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/12/30");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:liblog4j2-java");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:liblog4j2-java-doc");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:9.0");
  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) 2021-2022 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');
var release = chomp(release);
if (! preg(pattern:"^(9)\.[0-9]+", string:release)) audit(AUDIT_OS_NOT, 'Debian 9.0', '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': '9.0', 'prefix': 'liblog4j2-java', 'reference': '2.12.3-0+deb9u1'},
    {'release': '9.0', 'prefix': 'liblog4j2-java-doc', 'reference': '2.12.3-0+deb9u1'}
];

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, 'liblog4j2-java / liblog4j2-java-doc');
}