Apache Log4j 2.x < 2.13.2 Information Disclosure Vulnerability - Linux

# 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("1.3.6.1.4.1.25623.1.0.117865");
  script_version("2025-09-04T05:39:49+0000");
  script_tag(name:"last_modification", value:"2025-09-04 05:39:49 +0000 (Thu, 04 Sep 2025)");
  script_tag(name:"creation_date", value:"2021-12-22 10:19:26 +0000 (Wed, 22 Dec 2021)");
  script_tag(name:"cvss_base", value:"4.3");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:P/I:N/A:N");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2021-06-17 20:15:00 +0000 (Thu, 17 Jun 2021)");

  script_cve_id("CVE-2020-9488");

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

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

  script_name("Apache Log4j 2.x < 2.13.2 Information Disclosure Vulnerability - Linux");

  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_tag(name:"summary", value:"Apache Log4j is prone to an information disclosure
  vulnerability.");

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

  script_tag(name:"insight", value:"Improper validation of certificate with host mismatch in Log4j2
  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.

  The reported issue was caused by an error in SslConfiguration. Any element using SslConfiguration
  in the Log4j Configuration is also affected by this issue. This includes HttpAppender,
  SocketAppender, and SyslogAppender. Usages of SslConfiguration that are configured via system
  properties are not affected.");

  script_tag(name:"affected", value:"Apache Log4j versions 2.0.x through 2.13.1.");

  script_tag(name:"solution", value:"Update to version 2.13.2 or later.");

  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/LOG4J2-2819");

  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( version:version, test_version:"2.0", test_version2:"2.13.1" ) ) {
  report = report_fixed_ver( installed_version:version, fixed_version:"2.13.2", install_path:location );
  security_message( port:port, data:report );
  exit( 0 );
}

exit( 99 );