Novell eDirectory Host Environment Service (dhost.exe) HTTP Connection Header DoS

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

include("compat.inc");

if (description)
{
  script_id(31863);
  script_version("1.16");
  script_cvs_date("Date: 2018/11/15 20:50:21");

  script_cve_id("CVE-2008-0927");
  script_bugtraq_id(28757);

  script_name(english:"Novell eDirectory Host Environment Service (dhost.exe) HTTP Connection Header DoS");
  script_summary(english:"Checks version from an ldap search");
 
  script_set_attribute(attribute:"synopsis", value:
"The remote directory service is affected by a denial of service issue.");
  script_set_attribute(attribute:"description", value:
"The remote host is running eDirectory, a directory service software
from Novell. 

The installed version of eDirectory is affected by a denial of service
issue. By sending an HTTP request with a specially crafted
'Connection' header to the server, an unauthenticated attacker may be
able to trigger a denial of service condition causing dhost.exe to
consume 100% of the CPU and crash the system.");
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?3eebe0a9");
  script_set_attribute(attribute:"solution", value:"Upgrade to eDirectory 8.8.2/8.7.3 SP10 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_cwe_id(399);

  script_set_attribute(attribute:"plugin_publication_date", value: "2008/04/16");

  script_set_attribute(attribute:"plugin_type", value: "remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:novell:edirectory");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Denial of Service");
  script_copyright(english:"This script is Copyright (C) 2008-2018 Tenable Network Security, Inc.");
  script_dependencies("http_version.nasl", "ldap_search.nasl", "os_fingerprint.nasl");
  script_require_keys("Services/ldap");
  script_require_ports(8008,8028,8010,8030);

  exit(0);
}


os = get_kb_item_or_exit("Host/OS");
if ("Windows" >!< os) exit(0, "The remote host is not running Windows.");

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

port =  get_http_port(default:8008); # Cleartext http port on eDirectory 8.7.3

ldap_port = NULL;
ldap_port = get_kb_item_or_exit("Services/ldap");

edir_ldap = get_kb_item(string("LDAP/",ldap_port,"/vendorVersion"));
edir_product = strstr(edir_ldap,"Novell eDirectory");
edir_product = edir_product - strstr(edir_product , "(");

if ( isnull(edir_ldap) || "Novell eDirectory" >!< edir_ldap ) exit(0);

edir_ldap_ver = NULL;

if ("Novell eDirectory 8.7.3" >< edir_ldap)
 {
  edir_ldap_ver = eregmatch(pattern:"^LDAP Agent for Novell eDirectory ([0-9])\.([0-9])\.([0-9])\.*([0-9]*) *\([0-9]+\.[0-9]+\)$", string:edir_ldap);  
  # KB entries
  # LDAP Agent for Novell eDirectory 8.7.3.10 (10555.95) # patched
  # LDAP Agent for Novell eDirectory 8.7.3 (10552.72)    # unpatched

  if ((isnull(edir_ldap_ver[4]) || int(edir_ldap_ver[4]) < 10))
   {
     if(report_verbosity)
      {
        report = string(
          "\n",
	  " ",edir_product," is installed on the remote host.\n"
        );
        security_hole(port:port, extra:report);
      }	
     else	
     security_hole(port); 
   }  
 }

else if ("Novell eDirectory 8.8" >< edir_ldap)
{
 # KB entries
 # LDAP Agent for Novell eDirectory 8.8 (20114.35) # unpatched 
 # LDAP Agent for Novell eDirectory 8.8 SP1 (20114.57) unpatched
 # LDAP Agent for Novell eDirectory 8.8 SP2 (20216.46) # patched
 
     if  ("Novell eDirectory 8.8 SP2" >< edir_ldap) exit(0);
 else if ( ereg(pattern:"^LDAP Agent for Novell eDirectory 8.8 *SP1 *\(([0-9]+)\.([0-9]+)\)$",string:edir_ldap)	||
	   ereg(pattern:"^LDAP Agent for Novell eDirectory 8.8 *\(([0-9]+)\.([0-9]+)\)$",string:edir_ldap)
         )
          { 
            if(report_verbosity)
            {
              report = string(
              "\n",
              " ",edir_product," is installed on the remote host.\n"
              );
              security_hole(port:port, extra:report);
            }
            else
  	    security_hole(port); 
  	    exit (0);
    	} 
}