Microsoft Kerberos Privilege Escalation Vulnerabilities (2496930)

###############################################################################
# OpenVAS Vulnerability Test
# $Id: secpod_ms11-013.nasl 5362 2017-02-20 12:46:39Z cfi $
#
# Microsoft Kerberos Privilege Escalation Vulnerabilities (2496930)
#
# Authors:
# Antu Sanadi <[email protected]>
#
# Updated by: Antu Sanadi <[email protected]> on 2011-03-17 
# updated the affected software in description part.
# 
# Copyright:
# Copyright (c) 2011 SecPod, http://www.secpod.com
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2
# (or any later version), as published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
###############################################################################

tag_impact = "Successful exploitation could allow authenticated attackers to obtain a token
  with elevated privileges on the affected system and allows a man-in-the-middle
  attacker to force a downgrade in Kerberos communication between a client and
  server.
  Impact Level: System";
tag_affected = "Microsoft Windows 7 Service Pack 1 and prior.
  Microsoft Windows XP Service Pack 3  and prior.
  Microsoft Windows 2003 Service Pack 2 and prior.";
tag_insight = "The flaws are due to:
   - An error in  Kerberos implementation supporting weak hashing mechanisms
     such as CRC32.
   - An error in Kerberos that does not correctly enforce stronger default
     encryption standards.";
tag_solution = "Run Windows Update and update the listed hotfixes or download and
  update mentioned hotfixes in the advisory from the below link,
  http://www.microsoft.com/technet/security/bulletin/ms11-013.mspx";
tag_summary = "This host is missing a critical security update according to Microsoft
  Bulletin MS11-013.";

if(description)
{
  script_id(902288);
  script_version("$Revision: 5362 $");
  script_tag(name:"last_modification", value:"$Date: 2017-02-20 13:46:39 +0100 (Mon, 20 Feb 2017) $");
  script_tag(name:"creation_date", value:"2011-02-09 17:14:46 +0100 (Wed, 09 Feb 2011)");
  script_cve_id("CVE-2011-0043", "CVE-2011-0091");
  script_bugtraq_id(46130, 46140);
  script_tag(name:"cvss_base", value:"7.2");
  script_tag(name:"cvss_base_vector", value:"AV:L/AC:L/Au:N/C:C/I:C/A:C");
  script_name("Microsoft Kerberos Privilege Escalation Vulnerabilities (2496930)");

  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2011 SecPod");
  script_family("Windows : Microsoft Bulletins");
  script_dependencies("secpod_reg_enum.nasl");
  script_require_ports(139, 445);
  script_mandatory_keys("SMB/WindowsVersion");

  script_tag(name : "impact" , value : tag_impact);
  script_tag(name : "affected" , value : tag_affected);
  script_tag(name : "insight" , value : tag_insight);
  script_tag(name : "solution" , value : tag_solution);
  script_tag(name : "summary" , value : tag_summary);
  script_tag(name:"qod_type", value:"registry");
  script_tag(name:"solution_type", value:"VendorFix");
  script_xref(name : "URL" , value : "http://support.microsoft.com/kb/2478971");
  script_xref(name : "URL" , value : "http://support.microsoft.com/kb/2478971");
  script_xref(name : "URL" , value : "http://www.vupen.com/english/advisories/2011/0326");
  script_xref(name : "URL" , value : "http://www.microsoft.com/technet/security/bulletin/ms11-013.mspx");
  exit(0);
}


include("smb_nt.inc");
include("secpod_reg.inc");
include("version_func.inc");
include("secpod_smb_func.inc");

if(hotfix_check_sp(xp:4, win2003:3, win7:2) <= 0){
  exit(0);
}

# Check for MS11-013 Hotfix
if((hotfix_missing(name:"2478971") == 0) || (hotfix_missing(name:"2425227") == 0)){
  exit(0);
}

sysPath = smb_get_systemroot();
if(!sysPath){
  exit(0);
}

sysVer = fetch_file_version(sysPath, file_name:"system32\Kerberos.dll");
if(!sysVer){
  exit(0);
}

## Windows XP
if(hotfix_check_sp(xp:4) > 0)
{
  SP = get_kb_item("SMB/WinXP/ServicePack");
  if("Service Pack 3" >< SP)
  {
    ## Grep for Kerberos.dll version < 5.1.2600.6059
    if(version_is_less(version:sysVer, test_version:"5.1.2600.6059")){
       security_message(0);
    }
    exit(0);
  }
  security_message(0);
}

# Windows 2003
else if(hotfix_check_sp(win2003:3) > 0)
{
  SP = get_kb_item("SMB/Win2003/ServicePack");
  if("Service Pack 2" >< SP)
  {
    # Grep for Kerberos.dll version < 5.2.3790.4806
    if(version_is_less(version:sysVer, test_version:"5.2.3790.4806")){
      security_message(0);
    }
    exit(0);
  }
  security_message(0);
}

## Windows 7
else if(hotfix_check_sp(win7:2) > 0)
{
  ## Check for Kerberos.dll version 
  if(version_is_less(version:sysVer, test_version:"6.1.7600.16722") ||
     version_in_range(version:sysVer, test_version:"6.1.7600.20000", test_version2:"6.1.7600.20860") || 
     version_in_range(version:sysVer, test_version:"6.1.7601.10000", test_version2:"6.1.7601.17526") ||
     version_in_range(version:sysVer, test_version:"6.1.7601.20000", test_version2:"6.1.7601.21623")) {
    security_message(0);
  }
}