Microsoft Windows CryptoAPI X.509 Spoofing Vulnerabilities (974571)

# SPDX-FileCopyrightText: 2009 Greenbone AG
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.900876");
  script_version("2026-04-28T06:28:06+0000");
  script_tag(name:"last_modification", value:"2026-04-28 06:28:06 +0000 (Tue, 28 Apr 2026)");
  script_tag(name:"creation_date", value:"2009-10-14 16:47:08 +0200 (Wed, 14 Oct 2009)");
  script_tag(name:"cvss_base", value:"7.5");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_cve_id("CVE-2009-2510", "CVE-2009-2511");
  script_name("Microsoft Windows CryptoAPI X.509 Spoofing Vulnerabilities (974571)");
  script_xref(name:"URL", value:"http://support.microsoft.com/kb/974571");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/36475");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/36577");
  script_xref(name:"URL", value:"http://www.vupen.com/english/advisories/2009/2891");
  script_xref(name:"URL", value:"https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-056");

  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2009 Greenbone AG");
  script_family("Windows : Microsoft Bulletins");
  script_dependencies("secpod_reg_enum.nasl");
  script_require_ports(139, 445);
  script_mandatory_keys("SMB/registry_enumerated");

  script_tag(name:"impact", value:"Successful exploitation will allow attacker to conduct spoofing attacks on
  the affected system.");
  script_tag(name:"affected", value:"- Microsoft Windows 7

  - Microsoft Windows 2K  Service Pack 4 and prior

  - Microsoft Windows XP  Service Pack 3 and prior

  - Microsoft Windows 2K3 Service Pack 2 and prior

  - Microsoft Windows Vista Service Pack 1/2 and prior

  - Microsoft Windows Server 2008 Service Pack 1/2 and prior");
  script_tag(name:"insight", value:"- The issue is due to the Windows CryptoAPI incorrectly parsing a null
    terminator as the end of any values identified by an Object Identifier (OID)
    when processing ASN.1 information from X.509 certificates.

  - An integer overflow error in the Windows CryptoAPI when parsing ASN.1 object
    identifiers from X.509 certificates, which could allow an attacker to
    generate a malicious certificate that would be parsed incorrectly by the
    Windows CryptoAPI.");
  script_tag(name:"solution", value:"The vendor has released updates. Please see the references for more information.");
  script_tag(name:"summary", value:"This host is missing a critical security update according to
  Microsoft Bulletin MS09-056.");
  script_tag(name:"qod_type", value:"executable_version");
  script_tag(name:"solution_type", value:"VendorFix");
  script_xref(name:"URL", value:"https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-056");
  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, win2k:5, win2003:3, winVista:3, win7:1, win2008:3) <= 0){
  exit(0);
}

# MS09-056 Hotfix check
if(hotfix_missing(name:"974571") == 0){
  exit(0);
}

sysPath = smb_get_system32root();
if(sysPath)
{
  dllVer = fetch_file_version(sysPath:sysPath, file_name:"msasn1.dll");
  if(!dllVer){
    exit(0);
  }
}

if(hotfix_check_sp(win2k:5) > 0)
{
  if(version_is_less(version:dllVer, test_version:"5.0.2195.7334")){
    report = report_fixed_ver(installed_version:dllVer, fixed_version:"5.0.2195.7334", install_path:sysPath);
    security_message(port: 0, data: report);
  }
}

#  Windows XP
else if(hotfix_check_sp(xp:4) > 0)
{
  SP = get_kb_item("SMB/WinXP/ServicePack");
  if("Service Pack 2" >< SP)
  {
    if(version_is_less(version:dllVer, test_version:"5.1.2600.3624")){
      report = report_fixed_ver(installed_version:dllVer, fixed_version:"5.1.2600.3624", install_path:sysPath);
      security_message(port: 0, data: report);
    }
    exit(0);
  }
  else if("Service Pack 3" >< SP)
  {
    if(version_is_less(version:dllVer, test_version:"5.1.2600.5875")){
      report = report_fixed_ver(installed_version:dllVer, fixed_version:"5.1.2600.5875", install_path:sysPath);
      security_message(port: 0, data: report);
    }
    exit(0);
  }
  security_message( port: 0, data: "The target host was found to be vulnerable" );
}

else if(hotfix_check_sp(win2003:3) > 0)
{
  SP = get_kb_item("SMB/Win2003/ServicePack");
  if("Service Pack 2" >< SP)
  {
    if(version_is_less(version:dllVer, test_version:"5.2.3790.4584")){
      report = report_fixed_ver(installed_version:dllVer, fixed_version:"5.2.3790.4584", install_path:sysPath);
      security_message(port: 0, data: report);
    }
     exit(0);
  }
  security_message( port: 0, data: "The target host was found to be vulnerable" );
}

sysPath = smb_get_system32root();
if(sysPath)
{
  dllVer = fetch_file_version(sysPath:sysPath, file_name:"msasn1.dll");
  if(!dllVer){
    exit(0);
  }
}

if(hotfix_check_sp(winVista:3) > 0)
{
  SP = get_kb_item("SMB/WinVista/ServicePack");
  if("Service Pack 1" >< SP)
  {
    if(version_is_less(version:dllVer, test_version:"6.0.6001.18326")){
      report = report_fixed_ver(installed_version:dllVer, fixed_version:"6.0.6001.18326", install_path:sysPath);
      security_message(port: 0, data: report);
    }
     exit(0);
  }

  if("Service Pack 2" >< SP)
  {
      if(version_is_less(version:dllVer, test_version:"6.0.6002.18106")){
      report = report_fixed_ver(installed_version:dllVer, fixed_version:"6.0.6002.18106", install_path:sysPath);
      security_message(port: 0, data: report);
    }
     exit(0);
  }
  security_message( port: 0, data: "The target host was found to be vulnerable" );
}

else if(hotfix_check_sp(win2008:3) > 0)
{
  SP = get_kb_item("SMB/Win2008/ServicePack");
  if("Service Pack 1" >< SP)
  {
    if(version_is_less(version:dllVer, test_version:"6.0.6001.18326")){
      report = report_fixed_ver(installed_version:dllVer, fixed_version:"6.0.6001.18326", install_path:sysPath);
      security_message(port: 0, data: report);
    }
     exit(0);
  }

  if("Service Pack 2" >< SP)
  {
    if(version_is_less(version:dllVer, test_version:"6.0.6002.18106")){
      report = report_fixed_ver(installed_version:dllVer, fixed_version:"6.0.6002.18106", install_path:sysPath);
      security_message(port: 0, data: report);
    }
     exit(0);
  }
 security_message( port: 0, data: "The target host was found to be vulnerable" );
}

else if(hotfix_check_sp(win7:1) > 0)
{
  if(version_is_less(version:dllVer, test_version:"6.1.7600.16415")){
     report = report_fixed_ver(installed_version:dllVer, fixed_version:"6.1.7600.16415", install_path:sysPath);
     security_message(port: 0, data: report);
  }
}