Apache Log4j 2.0.x Multiple Vulnerabilities (Linux/Unix, Log4Shell) - Version Check

# Copyright (C) 2021 Greenbone Networks GmbH
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-or-later
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

CPE = "cpe:/a:apache:log4j";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.117822");
  script_version("2022-08-09T10:11:17+0000");
  script_xref(name:"CISA", value:"Known Exploited Vulnerability (KEV) catalog");
  script_xref(name:"URL", value:"https://www.cisa.gov/known-exploited-vulnerabilities-catalog");
  script_cve_id("CVE-2021-44228", "CVE-2021-45046");
  script_tag(name:"last_modification", value:"2022-08-09 10:11:17 +0000 (Tue, 09 Aug 2022)");
  script_tag(name:"creation_date", value:"2021-12-11 15:08:22 +0000 (Sat, 11 Dec 2021)");
  script_tag(name:"cvss_base", value:"9.3");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:C/I:C/A:C");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2021-12-14 01:15:00 +0000 (Tue, 14 Dec 2021)");
  script_name("Apache Log4j 2.0.x Multiple Vulnerabilities (Linux/Unix, Log4Shell) - Version Check");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2021 Greenbone Networks GmbH");
  script_family("General");
  script_dependencies("gb_apache_log4j_consolidation.nasl", "os_detection.nasl");
  script_mandatory_keys("apache/log4j/detected", "Host/runs_unixoide");

  script_xref(name:"URL", value:"https://logging.apache.org/log4j/2.x/security.html");
  script_xref(name:"URL", value:"https://issues.apache.org/jira/browse/LOG4J2-3198");
  script_xref(name:"URL", value:"https://issues.apache.org/jira/browse/LOG4J2-3201");
  script_xref(name:"URL", value:"https://github.com/apache/logging-log4j2/pull/607");
  script_xref(name:"URL", value:"https://github.com/apache/logging-log4j2/pull/608");
  script_xref(name:"URL", value:"https://github.com/advisories/GHSA-jfh8-c2jp-5v3q");
  script_xref(name:"URL", value:"https://www.openwall.com/lists/oss-security/2021/12/10/1");
  script_xref(name:"URL", value:"https://www.lunasec.io/docs/blog/log4j-zero-day/");
  script_xref(name:"URL", value:"https://www.lunasec.io/docs/blog/log4j-zero-day-update-on-cve-2021-45046/");
  script_xref(name:"URL", value:"https://www.cyberkendra.com/2021/12/worst-log4j-rce-zeroday-dropped-on.html");
  script_xref(name:"URL", value:"https://github.com/YfryTchsGD/Log4jAttackSurface");
  script_xref(name:"URL", value:"http://packetstormsecurity.com/files/165225/Apache-Log4j2-2.14.1-Remote-Code-Execution.html");
  script_xref(name:"URL", value:"https://github.com/tangxiaofeng7/apache-log4j-poc");
  script_xref(name:"URL", value:"https://github.com/0x0021h/apache-log4j-rce");

  script_tag(name:"summary", value:"Apache Log4j is prone to multiple vulnerabilities.");

  script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present on the target host.");

  script_tag(name:"insight", value:"The following vulnerabilities exist:

  CVE-2021-44228: Apache Log4j2 JNDI features used in configuration, log messages, and parameters do
  not protect against attacker controlled LDAP and other JNDI related endpoints. An attacker who can
  control log messages or log message parameters can execute arbitrary code loaded from LDAP servers
  when message lookup substitution is enabled. This vulnerability is dubbed 'Log4Shell'.

  CVE-2021-45046: Denial of Service (DoS) and a possible remote code execution (RCE) in certain
  non-default configurations.");

  script_tag(name:"affected", value:"Apache Log4j versions 2.0.x.");

  script_tag(name:"solution", value:"Update Apache Log4j to version 2.12.2, 2.16.0 or later.

  If Apache Log4j is embedded into a specific product please contact the vendor of the product for
  additional info on the availability of updates.");

  script_tag(name:"qod_type", value:"executable_version_unreliable");
  script_tag(name:"solution_type", value:"VendorFix");

  exit(0);
}

include("host_details.inc");
include("version_func.inc");

if( isnull( port = get_app_port( cpe:CPE ) ) )
  exit( 0 );

if( ! infos = get_app_version_and_location( cpe:CPE, port:port, exit_no_version:TRUE ) )
  exit( 0 );

version = infos["version"];
location = infos["location"];

if( version_in_range_exclusive( version:version, test_version_lo:"2.0", test_version_up:"2.12.2" ) ) {
  report = report_fixed_ver( installed_version:version, fixed_version:"2.12.2", install_path:location );
  security_message( port:port, data:report );
  exit( 0 );
}

if( version_in_range_exclusive( version:version, test_version_lo:"2.13", test_version_up:"2.16.0" ) ) {
  report = report_fixed_ver( installed_version:version, fixed_version:"2.16.0", install_path:location );
  security_message( port:port, data:report );
  exit( 0 );
}

exit( 99 );