ModSecurity < 2.5.9 Multipart Request Header Name DoS

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(67125);
  script_version("1.11");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/04/11");

  script_cve_id("CVE-2009-1902");
  script_bugtraq_id(34096);
  script_xref(name:"EDB-ID", value:"8241");

  script_name(english:"ModSecurity < 2.5.9 Multipart Request Header Name DoS");

  script_set_attribute(attribute:"synopsis", value:
"The remote web application firewall may be affected by a denial of
service vulnerability.");
  script_set_attribute(attribute:"description", value:
"According to its banner, the version of ModSecurity installed on the
remote host is earlier than 2.5.9. It is, therefore, potentially
affected by a denial of service vulnerability. An error exists related
to multipart form HTTP POST requests with a missing part header name
that could allow an attacker to crash the application.

Note that Nessus has not tested for this issue but has instead relied
only on the version in the server's banner.");
  script_set_attribute(attribute:"see_also", value:"https://seclists.org/bugtraq/2009/Mar/187");
  script_set_attribute(attribute:"solution", value:
"Upgrade to ModSecurity version 2.5.9 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2009/03/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2009/03/05");
  script_set_attribute(attribute:"plugin_publication_date", value:"2013/07/02");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:modsecurity:modsecurity");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Firewalls");

  script_copyright(english:"This script is Copyright (C) 2013-2022 Tenable Network Security, Inc.");

  script_dependencies("modsecurity_http_version.nasl");
  script_require_keys("www/ModSecurity", "Settings/ParanoidReport");
  script_require_ports("Services/www", 80);

  exit(0);
}

include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");
include("http.inc");

port = get_http_port(default:80);

# Make sure this is ModSecurity
get_kb_item_or_exit('www/'+port+'/modsecurity');
version = get_kb_item_or_exit('www/modsecurity/'+port+'/version', exit_code:1);
backported = get_kb_item_or_exit('www/modsecurity/'+port+'/backported', exit_code:1);

if (report_paranoia < 2 && backported) audit(AUDIT_BACKPORT_SERVICE, port, "ModSecurity");

if (version == 'unknown') audit(AUDIT_UNKNOWN_WEB_SERVER_VER, "ModSecurity", port);

fixed_ver = '2.5.9';
if (
  version =~ "^[01]\." ||
  version =~ "^2\.([0-4]|5\.[0-8])($|[^0-9])"
)
{
  if (report_verbosity > 0)
  {
    source = get_kb_item_or_exit('www/modsecurity/'+port+'/source', exit_code:1);
    report =
      '\n  Version source    : ' + source +
      '\n  Installed version : ' + version +
      '\n  Fixed version     : ' + fixed_ver + '\n';
    security_hole(port:port, extra:report);
  }
  else security_hole(port);
  exit(0);
}
else audit(AUDIT_LISTEN_NOT_VULN, "ModSecurity", port, version);