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nessusThis script is Copyright (C) 2021-2024 and is owned by Tenable, Inc. or an Affiliate thereof.SMB_NT_MS21_MAY_INTERNET_EXPLORER.NASL
HistoryMay 11, 2021 - 12:00 a.m.

Security Updates for Internet Explorer (May 2021)

2021-05-1100:00:00
This script is Copyright (C) 2021-2024 and is owned by Tenable, Inc. or an Affiliate thereof.
www.tenable.com
153

CVSS2

7.6

Attack Vector

NETWORK

Attack Complexity

HIGH

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:N/AC:H/Au:N/C:C/I:C/A:C

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

AI Score

8.5

Confidence

High

EPSS

0.937

Percentile

99.1%

The Internet Explorer installation on the remote host is missing a security update. It is, therefore, affected by the following vulnerability:

  • An memory corruption vulnerability exists. An attacker can exploit this to corrupt the memory and cause unexpected behaviors within the system/application.
    (CVE-2021-26419)
#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from the Microsoft Security Updates API. The text
# itself is copyright (C) Microsoft Corporation.
#

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(149386);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/01/02");

  script_cve_id("CVE-2021-26419");
  script_xref(name:"MSKB", value:"5003210");
  script_xref(name:"MSFT", value:"MS21-5003210");
  script_xref(name:"MSKB", value:"5003233");
  script_xref(name:"MSFT", value:"MS21-5003233");
  script_xref(name:"MSKB", value:"5003209");
  script_xref(name:"MSFT", value:"MS21-5003209");
  script_xref(name:"MSKB", value:"5003165");
  script_xref(name:"MSKB", value:"5003208");
  script_xref(name:"MSFT", value:"MS21-5003165");
  script_xref(name:"MSFT", value:"MS21-5003208");
  script_xref(name:"IAVA", value:"2021-A-0224");

  script_name(english:"Security Updates for Internet Explorer (May 2021)");

  script_set_attribute(attribute:"synopsis", value:
"The Internet Explorer installation on the remote host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"The Internet Explorer installation on the remote host is
missing a security update. It is, therefore, affected by the
following vulnerability:

  - An memory corruption vulnerability exists. An attacker
    can exploit this to corrupt the memory and cause
    unexpected behaviors within the system/application.
    (CVE-2021-26419)");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/en-us/topic/5003165");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/en-us/topic/5003208");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/en-us/topic/5003209");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/en-us/topic/5003210");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/en-us/topic/5003233");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released the following security updates to address this issue:  
  -KB5003165
  -KB5003208
  -KB5003209
  -KB5003210
  -KB5003233");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:H/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:H/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:H/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-26419");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"exploited_by_malware", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/05/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/05/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/05/11");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:ie");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2021-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("smb_check_rollup.nasl", "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("smb_hotfixes_fcheck.inc");
include("smb_hotfixes.inc");
include("smb_func.inc");

get_kb_item_or_exit("SMB/MS_Bulletin_Checks/Possible");

var bulletin = 'MS21-05';
var kbs = make_list(
  '5003165',
  '5003208',
  '5003209',
  '5003210',
  '5003233'
);

if (get_kb_item("Host/patch_management_checks")) hotfix_check_3rd_party(bulletin:bulletin, kbs:kbs, severity:SECURITY_HOLE);

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

if (hotfix_check_sp_range(vista:'2', win7:'1', win8:'0',  win81:'0') <= 0) audit(AUDIT_OS_SP_NOT_VULN);

var productname = get_kb_item_or_exit("SMB/ProductName", exit_code:1);
if ("Windows 8" >< productname && "8.1" >!< productname)
 audit(AUDIT_OS_SP_NOT_VULN);
if ("Vista" >< productname) audit(AUDIT_OS_SP_NOT_VULN);

if (hotfix_check_server_core() == 1) audit(AUDIT_WIN_SERVER_CORE);

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

if (
  # Windows 8.1 / Windows Server 2012 R2
  # Internet Explorer 11
  hotfix_is_vulnerable(os:"6.3", sp:0, file:"mshtml.dll", version:"11.0.9600.20016", min_version:"11.0.9600.16000", dir:"\system32", bulletin:bulletin, kb:"5003165") ||

  # Windows Server 2012
  # Internet Explorer 11
  hotfix_is_vulnerable(os:"6.2", sp:0, file:"mshtml.dll", version:"11.0.9600.20016", min_version:"11.0.9600.16000", dir:"\system32", bulletin:bulletin, kb:"5003165") ||

  # Windows 7 / Server 2008 R2
  # Internet Explorer 11
  hotfix_is_vulnerable(os:"6.1", sp:1, file:"mshtml.dll", version:"11.0.9600.20016", min_version:"11.0.9600.16000", dir:"\system32", bulletin:bulletin, kb:"5003165") ||

  # Windows Server 2008
  # Internet Explorer 9
  hotfix_is_vulnerable(os:"6.0", sp:2, file:"mshtml.dll", version:"9.0.8112.21542", min_version:"9.0.8112.16000", dir:"\system32", bulletin:bulletin, kb:"5003165")
)
{
  var report =  '\nNote: The fix for this issue is available in either of the following updates:\n';
  report += '  - KB5003165 : Cumulative Security Update for Internet Explorer\n';

  if(os == "6.3")
  {
    report += '  - KB5003209 : Windows 8.1 / Server 2012 R2 Monthly Rollup\n';
    hotfix_add_report(bulletin:'MS21-05', kb:'5003209', report);
  }
  else if(os == "6.2")
  {
    report += '  - KB5003208 : Windows Server 2012 Monthly Rollup\n';
    hotfix_add_report(bulletin:'MS21-05', kb:'5003208', report);
  }
  else if(os == "6.1")
  {
    report += '  - KB5003233 : Windows 7 / Server 2008 R2 Monthly Rollup\n';
    hotfix_add_report(bulletin:'MS21-05', kb:'5003233', report);
  }
  else if(os == "6.0")
  {
    report += '  - KB5003210 : Windows Server 2008 Monthly Rollup\n';
    hotfix_add_report(bulletin:'MS21-05', kb:'5003210', report);
  }

  set_kb_item(name:'SMB/Missing/'+bulletin, value:TRUE);

  var port = kb_smb_transport();

  hotfix_security_hole();
  hotfix_check_fversion_end();
}
else
{
  hotfix_check_fversion_end();
  audit(AUDIT_HOST_NOT, hotfix_get_audit_report());
}

VendorProductVersionCPE
microsoftiecpe:/a:microsoft:ie

CVSS2

7.6

Attack Vector

NETWORK

Attack Complexity

HIGH

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:N/AC:H/Au:N/C:C/I:C/A:C

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

AI Score

8.5

Confidence

High

EPSS

0.937

Percentile

99.1%