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Debian DSA-5023-1 : modsecurity-apache - security update

The Debian 10 / 11 host is affected by a vulnerability in modsecurity-apache package (DSA-5023-1

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#%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-5023. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

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

if (description)
{
  script_id(156186);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/01/24");

  script_cve_id("CVE-2021-42717");

  script_name(english:"Debian DSA-5023-1 : modsecurity-apache - 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 a package installed that is affected by a vulnerability as referenced in the dsa-5023
advisory.

    It was discovered that modsecurity-apache, an Apache module to tighten the Web application security, does
    not properly handles excessively nested JSON objects, which could result in denial of service. The update
    introduces a new SecRequestBodyJsonDepthLimit option to limit the maximum request body JSON parsing depth
    which ModSecurity will accept (defaults to 10000). For the oldstable distribution (buster), this problem
    has been fixed in version 2.9.3-1+deb10u1. For the stable distribution (bullseye), this problem has been
    fixed in version 2.9.3-3+deb11u1. We recommend that you upgrade your modsecurity-apache packages. For the
    detailed security status of modsecurity-apache please refer to its security tracker page at:
    https://security-tracker.debian.org/tracker/modsecurity-apache

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.");
  # https://security-tracker.debian.org/tracker/source-package/modsecurity-apache
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b86f5745");
  script_set_attribute(attribute:"see_also", value:"https://www.debian.org/security/2021/dsa-5023");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2021-42717");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/buster/modsecurity-apache");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bullseye/modsecurity-apache");
  script_set_attribute(attribute:"solution", value:
"Upgrade the modsecurity-apache packages.

For the stable distribution (bullseye), this problem has been fixed in version 2.9.3-3+deb11u1.");
  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:POC/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:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-42717");

  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:"2021/12/07");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/12/18");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/12/19");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libapache2-mod-security2");
  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:"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) 2021-2025 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:"^(10)\.[0-9]+|^(11)\.[0-9]+", string:debian_release)) audit(AUDIT_OS_NOT, 'Debian 10.0 / 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': '10.0', 'prefix': 'libapache2-mod-security2', 'reference': '2.9.3-1+deb10u1'},
    {'release': '11.0', 'prefix': 'libapache2-mod-security2', 'reference': '2.9.3-3+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_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, 'libapache2-mod-security2');
}

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19 Dec 2021 00:00Current
7.5High risk
Vulners AI Score7.5
CVSS25
CVSS37.5
EPSS0.002
24
.json
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