MS11-005: Vulnerability in Active Directory Could Allow Denial of Service (2478953)

2011-02-08T00:00:00
ID SMB_NT_MS11-005.NASL
Type nessus
Reporter This script is Copyright (C) 2011-2018 Tenable Network Security, Inc.
Modified 2020-09-02T00:00:00

Description

The version of Active Directory installed on the remote host fails to properly validate service principal names (SPN), which could result in SPN collisions. If a collision occurs, services that use the SPN will downgrade to NTLM when configured to do so. Services that are not configured to negotiate will become unavailable.

A remote attacker who has local administrator privileges on a domain- joined host can exploit this, resulting in a denial of service.

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

include("compat.inc");

if (description)
{
  script_id(51905);
  script_version("1.17");
  script_cvs_date("Date: 2018/11/15 20:50:30");

  script_cve_id("CVE-2011-0040");
  script_bugtraq_id(46145);
  script_xref(name:"MSFT", value:"MS11-005");
  script_xref(name:"IAVB", value:"2011-B-0015");
  script_xref(name:"MSKB", value:"2478953");

  script_name(english:"MS11-005: Vulnerability in Active Directory Could Allow Denial of Service (2478953)");
  script_summary(english:"Checks the version of Ntdsa.dll.");

  script_set_attribute(attribute:"synopsis", value:
"The directory service on the remote host is affected by denial of
service vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Active Directory installed on the remote host fails to
properly validate service principal names (SPN), which could result in
SPN collisions. If a collision occurs, services that use the SPN will
downgrade to NTLM when configured to do so. Services that are not
configured to negotiate will become unavailable.

A remote attacker who has local administrator privileges on a domain-
joined host can exploit this, resulting in a denial of service.");
  script_set_attribute(attribute:"see_also", value:"https://docs.microsoft.com/en-us/security-updates/SecurityBulletins/2011/ms11-005");
  script_set_attribute(attribute:"solution", value:"Microsoft has released a patch for Windows 2003.");
 script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
 script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
 script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
 script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2011/02/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2011/02/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2011/02/08");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:microsoft:windows");
  script_set_attribute(attribute:"stig_severity", value:"II");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Windows : Microsoft Bulletins");

  script_copyright(english:"This script is Copyright (C) 2011-2018 Tenable Network Security, Inc.");

  script_dependencies("smb_hotfixes.nasl", "ms_bulletin_checks_possible.nasl");
  script_require_keys("SMB/MS_Bulletin_Checks/Possible");
  script_require_ports(139, 445, 'Host/patch_management_checks');

  exit(0);
}

include("audit.inc");
include("smb_func.inc");
include("smb_hotfixes.inc");
include("smb_hotfixes_fcheck.inc");
include("smb_reg_query.inc");
include("misc_func.inc");

get_kb_item_or_exit("SMB/MS_Bulletin_Checks/Possible");

bulletin = 'MS11-005';
kb = '2478953';

kbs = make_list(kb);
if (get_kb_item("Host/patch_management_checks")) hotfix_check_3rd_party(bulletin:bulletin, kbs:kbs, severity:SECURITY_WARNING);

get_kb_item_or_exit("SMB/Registry/Enumerated");
get_kb_item_or_exit("SMB/WindowsVersion", exit_code:1);

if (hotfix_check_sp_range(win2003:'2') <= 0) audit(AUDIT_OS_SP_NOT_VULN);

share = hotfix_get_systemdrive(exit_on_fail:TRUE, as_share:TRUE);
if (!is_accessible_share(share:share)) audit(AUDIT_SHARE_FAIL, share);

registry_init();
hklm = registry_hive_connect(hive:HKEY_LOCAL_MACHINE, exit_on_fail:TRUE);

# Determine if NTDS is enabled.
NTDS_Enabled = FALSE;

ntds_value = get_registry_value(
  handle:hklm, item:"SYSTEM\CurrentControlSet\Services\NTDS\Parameters\DSA Database file");
if (!isnull(ntds_value))
  NTDS_Enabled = TRUE;

RegCloseKey(handle:hklm);
close_registry(close:FALSE);

if (!NTDS_Enabled)
{
  hotfix_check_fversion_end();
  exit(0, "The host is not affected since the affected Active Directory product is not installed.");
}

# Check the file version.
if (hotfix_is_vulnerable(os:"5.2", sp:2, file:"ntdsa.dll", version:"5.2.3790.4808", dir:"\system32", bulletin:bulletin, kb:kb))
{
  set_kb_item(name:"SMB/Missing/"+bulletin, value:TRUE);
  hotfix_security_warning();

  hotfix_check_fversion_end();
  exit(0);
}
else
{
  hotfix_check_fversion_end();
  audit(AUDIT_HOST_NOT, 'affected');
}