Microsoft .NET Framework XML deserialization and memory handling vulnerabilities
# Copyright (C) 2020 Greenbone Networks GmbH
# 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-or-later
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# 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.
if(description)
{
script_oid("1.3.6.1.4.1.25623.1.0.817393");
script_version("2022-08-09T10:11:17+0000");
script_xref(name:"CISA", value:"Known Exploited Vulnerability (KEV) catalog");
script_xref(name:"URL", value:"https://www.cisa.gov/known-exploited-vulnerabilities-catalog");
script_cve_id("CVE-2020-1147", "CVE-2020-16937");
script_tag(name:"cvss_base", value:"6.8");
script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:P/I:P/A:P");
script_tag(name:"last_modification", value:"2022-08-09 10:11:17 +0000 (Tue, 09 Aug 2022)");
script_tag(name:"severity_vector", value:"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");
script_tag(name:"severity_origin", value:"NVD");
script_tag(name:"severity_date", value:"2020-08-20 15:15:00 +0000 (Thu, 20 Aug 2020)");
script_tag(name:"creation_date", value:"2020-10-14 08:37:56 +0530 (Wed, 14 Oct 2020)");
script_name("Microsoft .NET Framework Multiple Vulnerabilities (KB4579977)");
script_tag(name:"summary", value:"This host is missing a critical security
update according to Microsoft KB4579977");
script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present on the target host.");
script_tag(name:"insight", value:"Multiple flaws exist due to:
- An error in .NET Framework when the software fails to check the source markup
of XML file input.
- An error when the .NET Framework improperly handles objects in memory.");
script_tag(name:"impact", value:"Successful exploitation will allow an attacker
to gain access to sensitive information and run arbitrary code in the context of
the process responsible for deserialization of the XML content.");
script_tag(name:"affected", value:"Microsoft .NET Framework 3.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8 for Microsoft Windows 7 SP1 and Microsoft Windows Server 2008 R2 SP1.");
script_tag(name:"solution", value:"The vendor has released updates. Please see the references for more information.");
script_tag(name:"solution_type", value:"VendorFix");
script_tag(name:"qod_type", value:"executable_version");
script_xref(name:"URL", value:"https://support.microsoft.com/en-us/help/4579977");
script_category(ACT_GATHER_INFO);
script_copyright("Copyright (C) 2020 Greenbone Networks GmbH");
script_family("Windows : Microsoft Bulletins");
script_dependencies("smb_reg_service_pack.nasl");
script_require_ports(139, 445);
script_mandatory_keys("SMB/WindowsVersion");
exit(0);
}
include("smb_nt.inc");
include("secpod_reg.inc");
include("version_func.inc");
include("secpod_smb_func.inc");
if(hotfix_check_sp(win7:2, win7x64:2, win2008r2:2) <= 0){
exit(0);
}
if(!registry_key_exists(key:"SOFTWARE\Microsoft\.NETFramework")){
if(!registry_key_exists(key:"SOFTWARE\Microsoft\ASP.NET")){
if(!registry_key_exists(key:"SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full\")){
exit(0);
}
}
}
key_list = make_list("SOFTWARE\Microsoft\.NETFramework\", "SOFTWARE\Microsoft\ASP.NET\", "SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full\");
foreach key(key_list)
{
if(".NETFramework" >< key)
{
foreach item (registry_enum_keys(key:key))
{
NetPath = registry_get_sz(key:key + item, item:"InstallRoot");
if(NetPath && "\Microsoft.NET\Framework" >< NetPath)
{
foreach item (registry_enum_keys(key:key))
{
dotPath = NetPath + item;
dllVer = fetch_file_version(sysPath:dotPath, file_name:"System.data.dll");
if(dllVer)
{
if(version_in_range(version:dllVer, test_version:"2.0.50727", test_version2:"2.0.50727.8952"))
{
vulnerable_range = "2.0.50727 - 2.0.50727.8952";
break;
}
if(version_in_range(version:dllVer, test_version:"4.0.30319.30000", test_version2:"4.0.30319.36683"))
{
vulnerable_range = "4.0.30319.30000 - 4.0.30319.36683";
break;
}
else if(version_in_range(version:dllVer, test_version:"4.6", test_version2:"4.7.3700"))
{
vulnerable_range = "4.6 - 4.7.3700";
break;
}
else if(version_in_range(version:dllVer, test_version:"4.8", test_version2:"4.8.4260"))
{
vulnerable_range = "4.8 - 4.8.4260";
break;
}
}
}
if(vulnerable_range){
break;
}
}
}
}
if((!vulnerable_range) && "ASP.NET" >< key)
{
foreach item (registry_enum_keys(key:key))
{
dotPath = registry_get_sz(key:key + item, item:"Path");
if(dotPath && "\Microsoft.NET\Framework" >< dotPath)
{
dllVer = fetch_file_version(sysPath:dotPath, file_name:"System.data.dll");
if(dllVer)
{
if(version_in_range(version:dllVer, test_version:"2.0.50727", test_version2:"2.0.50727.8952"))
{
vulnerable_range = "2.0.50727 - 2.0.50727.8952";
break;
}
if(version_in_range(version:dllVer, test_version:"4.0.30319.30000", test_version2:"4.0.30319.36683"))
{
vulnerable_range = "4.0.30319.30000 - 4.0.30319.36683";
break;
}
else if(version_in_range(version:dllVer, test_version:"4.6", test_version2:"4.7.3700"))
{
vulnerable_range = "4.6 - 4.7.3700";
break;
}
else if(version_in_range(version:dllVer, test_version:"4.8", test_version2:"4.8.4260"))
{
vulnerable_range = "4.8 - 4.8.4260";
break;
}
}
}
}
}
## For versions greater than 4.5 (https://docs.microsoft.com/en-us/dotnet/framework/migration-guide/how-to-determine-which-versions-are-installed#net_b)
if((!vulnerable_range) && "NET Framework Setup" >< key)
{
dotPath = registry_get_sz(key:key, item:"InstallPath");
if(dotPath && "\Microsoft.NET\Framework" >< dotPath)
{
dllVer = fetch_file_version(sysPath:dotPath, file_name:"System.data.dll");
if(dllVer)
{
if(version_in_range(version:dllVer, test_version:"2.0.50727", test_version2:"2.0.50727.8952"))
{
vulnerable_range = "2.0.50727 - 2.0.50727.8952";
break;
}
if(version_in_range(version:dllVer, test_version:"4.0.30319.30000", test_version2:"4.0.30319.36683"))
{
vulnerable_range = "4.0.30319.30000 - 4.0.30319.36683";
break;
}
else if(version_in_range(version:dllVer, test_version:"4.6", test_version2:"4.7.3700"))
{
vulnerable_range = "4.6 - 4.7.3700";
break;
}
else if(version_in_range(version:dllVer, test_version:"4.8", test_version2:"4.8.4260"))
{
vulnerable_range = "4.8 - 4.8.4260";
break;
}
}
}
}
if(vulnerable_range)
{
report = report_fixed_ver(file_checked:dotPath + "System.data.dll",
file_version:dllVer, vulnerable_range:vulnerable_range);
security_message(data:report);
exit(0);
}
}
exit(99);
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