CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
87.6%
The Microsoft Excel Products are missing security updates. It is, therefore, affected by multiple vulnerabilities :
Microsoft Office Remote Code Execution Vulnerability (CVE-2021-28449)
Microsoft Excel Remote Code Execution Vulnerability (CVE-2021-28451, CVE-2021-28454, CVE-2021-28456) Note that Nessus has not tested for this issue but has instead relied only on the application’s self-reported version number.
#
# (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('compat.inc');
if (description)
{
script_id(148470);
script_version("1.7");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/01/04");
script_cve_id(
"CVE-2021-28449",
"CVE-2021-28451",
"CVE-2021-28454",
"CVE-2021-28456"
);
script_xref(name:"MSKB", value:"3017810");
script_xref(name:"MSKB", value:"4504721");
script_xref(name:"MSKB", value:"4504735");
script_xref(name:"MSFT", value:"MS21-3017810");
script_xref(name:"MSFT", value:"MS21-4504721");
script_xref(name:"MSFT", value:"MS21-4504735");
script_xref(name:"IAVA", value:"2021-A-0170-S");
script_name(english:"Security Updates for Microsoft Excel Products (April 2021)");
script_set_attribute(attribute:"synopsis", value:
"The Microsoft Excel Products are affected by multiple vulnerabilities.");
script_set_attribute(attribute:"description", value:
"The Microsoft Excel Products are missing security updates. It is, therefore, affected by multiple vulnerabilities :
- Microsoft Office Remote Code Execution Vulnerability (CVE-2021-28449)
- Microsoft Excel Remote Code Execution Vulnerability (CVE-2021-28451, CVE-2021-28454, CVE-2021-28456)
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/en-us/help/3017810");
script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/en-us/help/4504721");
script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/en-us/help/4504735");
script_set_attribute(attribute:"solution", value:
"Microsoft has released the following security updates to address this issue:
-KB3017810
-KB4504721
-KB4504735
For Office 365, Office 2016 C2R, or Office 2019, ensure automatic updates are enabled or open any office app and
manually perform an update.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");
script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-28454");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"exploit_available", value:"false");
script_set_attribute(attribute:"vuln_publication_date", value:"2021/04/13");
script_set_attribute(attribute:"patch_publication_date", value:"2021/04/13");
script_set_attribute(attribute:"plugin_publication_date", value:"2021/04/13");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:excel");
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("office_installed.nasl", "microsoft_office_compatibility_pack_installed.nbin", "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_func.inc');
include('smb_hotfixes.inc');
include('smb_hotfixes_fcheck.inc');
include('smb_reg_query.inc');
get_kb_item_or_exit('SMB/MS_Bulletin_Checks/Possible');
var bulletin = 'MS21-04';
var kbs = make_list(
'3017810',
'4504721',
'4504735'
);
if (get_kb_item('Host/patch_management_checks'))
hotfix_check_3rd_party(bulletin:bulletin, kbs:kbs, severity:SECURITY_WARNING);
get_kb_item_or_exit('SMB/Registry/Enumerated', exit_code:1);
var port = kb_smb_transport();
var checks = make_array(
'14.0', make_array('sp', 2, 'version', '14.0.7268.5000', 'kb', '3017810'),
'15.0', make_array('sp', 1, 'version', '15.0.5337.1000', 'kb', '4504735'),
'16.0', make_nested_list(
make_array('sp', 0, 'version', '16.0.5149.1000', 'channel', 'MSI', 'kb', '4504721')
)
);
if (hotfix_check_office_product(product:'Excel', checks:checks, bulletin:bulletin))
{
replace_kb_item(name:'SMB/Missing/'+bulletin, value:TRUE);
hotfix_security_warning();
hotfix_check_fversion_end();
exit(0);
}
else
{
hotfix_check_fversion_end();
audit(AUDIT_HOST_NOT, 'affected');
}
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-28449
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-28451
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-28454
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-28456
support.microsoft.com/en-us/help/3017810
support.microsoft.com/en-us/help/4504721
support.microsoft.com/en-us/help/4504735
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
87.6%