CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:M/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
AI Score
Confidence
High
EPSS
Percentile
99.5%
The Internet Explorer installation on the remote host is missing a security update. It is, therefore, affected by the following vulnerabilities:
A security bypass vulnerability exists in the HTML platforms component. An unauthenticated, remote attacker can exploit this to bypass security in order to gain full access to the system. (CVE-2021-34446)
A remote code execution vulnerability exists in the MSHTML platform. An unauthenticated, remote attacker can exploit this to bypass authentication and execute arbitrary commands. (CVE-2021-34447, CVE-2021-34497)
A memory corruption error exists in the scripting engine. An unauthenticated, remote attacker can exploit this to execute arbitrary commands. (CVE-2021-34448)
#%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(151597);
script_version("1.8");
script_set_attribute(attribute:"plugin_modification_date", value:"2023/12/29");
script_cve_id(
"CVE-2021-34446",
"CVE-2021-34447",
"CVE-2021-34448",
"CVE-2021-34497"
);
script_xref(name:"MSKB", value:"5004233");
script_xref(name:"MSKB", value:"5004289");
script_xref(name:"MSKB", value:"5004294");
script_xref(name:"MSKB", value:"5004298");
script_xref(name:"MSKB", value:"5004305");
script_xref(name:"MSFT", value:"MS21-5004233");
script_xref(name:"MSFT", value:"MS21-5004289");
script_xref(name:"MSFT", value:"MS21-5004294");
script_xref(name:"MSFT", value:"MS21-5004298");
script_xref(name:"MSFT", value:"MS21-5004305");
script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2021/11/17");
script_name(english:"Security Updates for Internet Explorer (July 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 vulnerabilities:
- A security bypass vulnerability exists in the HTML platforms component. An unauthenticated, remote attacker
can exploit this to bypass security in order to gain full access to the system. (CVE-2021-34446)
- A remote code execution vulnerability exists in the MSHTML platform. An unauthenticated, remote attacker
can exploit this to bypass authentication and execute arbitrary commands. (CVE-2021-34447, CVE-2021-34497)
- A memory corruption error exists in the scripting engine. An unauthenticated, remote attacker can exploit
this to execute arbitrary commands. (CVE-2021-34448)");
script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/en-us/topic/5004233");
script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/en-us/topic/5004289");
script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/en-us/topic/5004294");
script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/en-us/topic/5004298");
script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/en-us/topic/5004305");
script_set_attribute(attribute:"solution", value:
"Microsoft has released the following security updates to address this issue:
-KB5004233
-KB5004289
-KB5004294
-KB5004298
-KB5004305");
script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C");
script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N");
script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-34448");
script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2021-34446");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"vuln_publication_date", value:"2021/07/13");
script_set_attribute(attribute:"patch_publication_date", value:"2021/07/13");
script_set_attribute(attribute:"plugin_publication_date", value:"2021/07/13");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:ie");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Windows : Microsoft Bulletins");
script_copyright(english:"This script is Copyright (C) 2021-2023 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 = 'MS21-07';
var kbs = make_list(
'5004233',
'5004289',
'5004294',
'5004298',
'5004305'
);
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:"11.0.9600.20064", min_version:"11.0.9600.16000", dir:"\system32", bulletin:bulletin, kb:"5004233") ||
# Windows Server 2012
# Internet Explorer 11
hotfix_is_vulnerable(os:"6.2", sp:0, file:"mshtml.dll", version:"11.0.9600.20064", min_version:"11.0.9600.16000", dir:"\system32", bulletin:bulletin, kb:"5004233") ||
# Windows 7 / Server 2008 R2
# Internet Explorer 11
hotfix_is_vulnerable(os:"6.1", sp:1, file:"mshtml.dll", version:"11.0.9600.20064", min_version:"11.0.9600.16000", dir:"\system32", bulletin:bulletin, kb:"5004233") ||
# Windows Server 2008
# Internet Explorer 9
hotfix_is_vulnerable(os:"6.0", sp:2, file:"mshtml.dll", version:"9.0.8112.21575", min_version:"9.0.8112.16000", dir:"\system32", bulletin:bulletin, kb:"5004233")
)
{
var report = '\nNote: The fix for this issue is available in either of the following updates:\n';
report += ' - KB5004233 : Cumulative Security Update for Internet Explorer\n';
if(os == "6.3")
{
report += ' - KB5004298 : Windows 8.1 / Server 2012 R2 Monthly Rollup\n';
hotfix_add_report(bulletin:bulletin, kb:'5004298', report);
}
else if(os == "6.2")
{
report += ' - KB5004294 : Windows Server 2012 Monthly Rollup\n';
hotfix_add_report(bulletin:bulletin, kb:'5004294', report);
}
else if(os == "6.1")
{
report += ' - KB5004289 : Windows 7 / Server 2008 R2 Monthly Rollup\n';
hotfix_add_report(bulletin:bulletin, kb:'5004289', report);
}
else if(os == "6.0")
{
report += ' - KB5004305 : Windows Server 2008 Monthly Rollup\n';
hotfix_add_report(bulletin:bulletin, kb:'5004305', 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());
}
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-34446
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-34447
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-34448
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-34497
support.microsoft.com/en-us/topic/5004233
support.microsoft.com/en-us/topic/5004289
support.microsoft.com/en-us/topic/5004294
support.microsoft.com/en-us/topic/5004298
support.microsoft.com/en-us/topic/5004305
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:M/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
AI Score
Confidence
High
EPSS
Percentile
99.5%