Microsoft Windows Environment Variables

##
# (C) Tenable, Inc.
##

include("compat.inc");

if (description)
{
  script_id(92364);
  script_version("1.14");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/01/29");

  script_xref(name:"IAVT", value:"0001-T-0757");

  script_name(english:"Microsoft Windows Environment Variables");

  script_set_attribute(attribute:"synopsis", value:
"Nessus was able to collect and report environment variables from the
remote host.");
  script_set_attribute(attribute:"description", value:
"Nessus was able to collect system and active account environment
variables on the remote Windows host and generate a report as a CSV
attachment.");
  script_set_attribute(attribute:"solution", value:"n/a");
  script_set_attribute(attribute:"risk_factor", value:"None");

  script_set_attribute(attribute:"plugin_publication_date", value:"2016/07/19");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:microsoft:windows");
  script_set_attribute(attribute:"agent", value:"windows");
  script_set_attribute(attribute:"asset_inventory", value:"True");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Windows");
  script_copyright(english:"This script is Copyright (C) 2016-2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("smb_hotfixes.nasl");
  script_require_keys("SMB/Registry/Enumerated");
  script_require_ports(139, 445);

  exit(0);
}

include("smb_func.inc");
include("csv_generator.inc");

get_kb_item_or_exit("SMB/Registry/Enumerated");
var report;

# Disable if data protection is filtering user info
data_protection::disable_plugin_if_set(flags:[data_protection::DPKB_USERNAME]);

registry_init();
var hklm = registry_hive_connect(hive:HKEY_LOCAL_MACHINE, exit_on_fail:TRUE);
if (isnull(hklm))
{
   close_registry();
   audit(AUDIT_REG_FAIL);
}

#HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Environment
var hklm_values = get_reg_name_value_table(handle:hklm, key:"SYSTEM\CurrentControlSet\Control\Session Manager\Environment");

RegCloseKey(handle:hklm);

#HKU\<SID>\Environment
var hku_values = get_hku_key_values(key:"\Environment", reg_init:FALSE, resolve_sid:FALSE);
if (isnull(hku_values))
{
   close_registry();
   audit(AUDIT_REG_FAIL);
}

#HKU\<SID>\Volatile Environment
# - Examples: APPDATA, HOMEPATH, LOCALAPPDATA, USERPROFILE
var hku_volatile_env_values = get_hku_key_values(key:'\\Volatile Environment', reg_init:FALSE, resolve_sid:FALSE);
if (!empty_or_null(hku_volatile_env_values))
  hku_values = merge_arrays(hku_values, hku_volatile_env_values, options:{recursive:true});
else
  dbg::detailed_log(msg:'Failed to retrieve HKU\\<SID>\\Volatile Environment registry values.', lvl:1);

close_registry();

# create table do vars can be accessed from other plugins
query_scratchpad("CREATE TABLE IF NOT EXISTS windows_env_vars 
(id integer primary key autoincrement, 
sid text,
name text,
value text);
");

# get global environment variables
report += 'Global Environment Variables :\n';
var hklm_env = make_list();
var key;

foreach key(keys(hklm_values))
{
  report += '  ' + key + ' : ' + hklm_values[key] + '\n';
  hklm_env[max_index(hklm_env)] = make_array("name", key, "value", hklm_values[key]);
  query_scratchpad("INSERT INTO windows_env_vars (sid, name, value) VALUES (?, ?, ?);", "hklm", key, hklm_values[key]);
}

# get local environment variables for each active user
report += '\nActive User Environment Variables\n';
var hku_env = make_list();
var sid;

foreach sid(keys(hku_values))
{
  if ('S-1-5-21' >!< sid || '_classes' >< sid)
    continue;
  report += '  - ' + sid + '\n';
  foreach key(keys(hku_values[sid]))
  {
    report += '    ' + key + ' : ' + hku_values[sid][key] + '\n';
    hku_env[max_index(hku_env)] = make_array("sid", sid, "name", key, "value", hku_values[sid][key]);
    query_scratchpad("INSERT INTO windows_env_vars (sid, name, value) VALUES (?, ?, ?);", sid, key, hku_values[sid][key]);
  }
}

var attachments = make_list();
var i = 0;
var header, csv;

if (max_index(hklm_env) > 0)
{
  header = header_from_list(list:make_list("name", "value"));
  csv = generate_csv(header:header, data:hklm_env);
  attachments[i] = make_array();
  attachments[i]["name"] = "system_environment_variables.csv";
  attachments[i]["value"] = csv;
  attachments[i]["type"] = "text/csv";
  ++i;
}

if (max_index(hku_env) > 0)
{
  header = header_from_list(list:make_list("sid", "name", "value"));
  csv = generate_csv(header:header, data:hku_env);
  attachments[i] = make_array();
  attachments[i]["name"] = "user_environment_variables.csv";
  attachments[i]["value"] = csv;
  attachments[i]["type"] = "text/csv";
  ++i;
}

# Processor details to KB
var pair;

foreach pair (hklm_env)
{
  if ((pair.name =~ '^processor_' || pair.name == 'number_of_processors') && !empty_or_null(pair.value))
    set_kb_item(name:'Host/cpu/' + pair.name, value:pair.value);
}

if (max_index(attachments) > 0)
{
  security_report_with_attachments(port:0, level:0, extra:report, attachments:attachments);
}
else
{
  exit(0, "Environment variable information not found.");
}