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

# SPDX-FileCopyrightText: 2021 Greenbone AG
# 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-only

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

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.117822");
  script_version("2026-03-10T10:15:11+0000");
  script_cve_id("CVE-2021-44228", "CVE-2021-45046");
  script_tag(name:"last_modification", value:"2026-03-10 10:15:11 +0000 (Tue, 10 Mar 2026)");
  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 AG");
  script_family("General");
  script_dependencies("gb_apache_log4j_consolidation.nasl");
  script_mandatory_keys("apache/log4j/ssh-login/detected");

  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://github.com/advisories/GHSA-7rjr-3q55-vv33");
  script_xref(name:"URL", value:"https://www.openwall.com/lists/oss-security/2021/12/10/1");
  script_xref(name:"URL", value:"https://www.openwall.com/lists/oss-security/2021/12/14/4");
  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_xref(name:"URL", value:"https://www.cisa.gov/known-exploited-vulnerabilities-catalog");
  script_xref(name:"CISA", value:"Known Exploited Vulnerability (KEV) catalog");

  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 );