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
91.0%
The Microsoft Office Web Apps installation on the remote host is missing security updates. It is, therefore, affected by multiple vulnerabilities :
An information disclosure vulnerability exists when Microsoft Excel improperly discloses the contents of its memory. An attacker who exploited the vulnerability could use the information to compromise the users computer or data. (CVE-2020-1224)
A remote code execution vulnerability exists in Microsoft Word software when it fails to properly handle objects in memory. An attacker who successfully exploited the vulnerability could use a specially crafted file to perform actions in the security context of the current user. For example, the file could then take actions on behalf of the logged-on user with the same permissions as the current user. (CVE-2020-1218, CVE-2020-1338)
A remote code execution vulnerability exists in Microsoft Excel software when the software fails to properly handle objects in memory. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the current user. If the current user is logged on with administrative user rights, an attacker could take control of the affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. (CVE-2020-1335)
#
# (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(140431);
script_version("1.5");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/02/21");
script_cve_id(
"CVE-2020-1218",
"CVE-2020-1224",
"CVE-2020-1335",
"CVE-2020-1338"
);
script_xref(name:"MSKB", value:"4486661");
script_xref(name:"MSKB", value:"4484518");
script_xref(name:"MSKB", value:"4484503");
script_xref(name:"MSFT", value:"MS20-4486661");
script_xref(name:"MSFT", value:"MS20-4484518");
script_xref(name:"MSFT", value:"MS20-4484503");
script_xref(name:"CEA-ID", value:"CEA-2020-0118");
script_name(english:"Security Updates for Microsoft Office Web Apps (September 2020)");
script_set_attribute(attribute:"synopsis", value:
"The Microsoft Office Web Apps installation on the remote host is affected by multiple vulnerabilities.");
script_set_attribute(attribute:"description", value:
"The Microsoft Office Web Apps installation on the remote
host is missing security updates. It is, therefore, affected
by multiple vulnerabilities :
- An information disclosure vulnerability exists when
Microsoft Excel improperly discloses the contents of its
memory. An attacker who exploited the vulnerability
could use the information to compromise the users
computer or data. (CVE-2020-1224)
- A remote code execution vulnerability exists in
Microsoft Word software when it fails to properly handle
objects in memory. An attacker who successfully
exploited the vulnerability could use a specially
crafted file to perform actions in the security context
of the current user. For example, the file could then
take actions on behalf of the logged-on user with the
same permissions as the current user. (CVE-2020-1218,
CVE-2020-1338)
- A remote code execution vulnerability exists in
Microsoft Excel software when the software fails to
properly handle objects in memory. An attacker who
successfully exploited the vulnerability could run
arbitrary code in the context of the current user. If
the current user is logged on with administrative user
rights, an attacker could take control of the affected
system. An attacker could then install programs; view,
change, or delete data; or create new accounts with full
user rights. (CVE-2020-1335)");
# https://support.microsoft.com/en-us/help/4486661/security-update-for-sharepoint-server-2010-office-web-apps-sept-8-2020
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b3853e9d");
# https://support.microsoft.com/en-us/help/4484518/security-update-for-office-web-apps-server-2013-sept-8-2020
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?d4d39efc");
# https://support.microsoft.com/en-us/help/4484481/security-update-for-office-web-apps-server-2013-august-11-2020
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?a9c4e4e5");
script_set_attribute(attribute:"solution", value:
"Microsoft has released the following security updates to address this issue:
-KB4486661
-KB4484518
-KB4484503");
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-2020-1338");
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:"2020/09/08");
script_set_attribute(attribute:"patch_publication_date", value:"2020/09/08");
script_set_attribute(attribute:"plugin_publication_date", value:"2020/09/08");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:office_web_apps");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Windows : Microsoft Bulletins");
script_copyright(english:"This script is Copyright (C) 2020-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("office_installed.nasl", "microsoft_owa_installed.nbin", "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('install_func.inc');
get_kb_item_or_exit('SMB/MS_Bulletin_Checks/Possible');
bulletin = 'MS20-09';
kbs = make_list(
'4484503',
'4484518',
'4486661'
);
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);
port = kb_smb_transport();
# Get installs of Office Web Apps
owa_installs = get_installs(app_name:'Microsoft Office Web Apps');
if (!empty_or_null(owa_installs))
{
foreach owa_install (owa_installs[1])
{
if (owa_install['Product'] == '2010')
{
owa_2010_path = owa_install['path'];
owa_2010_sp = owa_install['SP'];
}
else if (owa_install['Product'] == '2013')
{
owa_2013_path = owa_install['path'];
owa_2013_sp = owa_install['SP'];
}
else if (owa_install['Product'] == '2016')
{
oos_path = owa_install['path'];
oos_sp = owa_install['SP'];
}
}
}
vuln = FALSE;
####################################################################
# Office Web Apps 2010 SP2
####################################################################
if (owa_2010_path && (!isnull(owa_2010_sp) && owa_2010_sp == '2'))
{
path = hotfix_append_path(path:owa_2010_path, value:'14.0\\WebServices\\ConversionService\\Bin\\Converter');
if (hotfix_check_fversion(file:'sword.dll', version:'14.0.7258.5000', min_version:'14.0.0.0', path:path, kb:'4486661', product:'Office Web Apps 2010') == HCF_OLDER)
vuln = TRUE;
}
####################################################################
# Office Web Apps 2013 SP1
####################################################################
if (owa_2013_path && (!isnull(owa_2013_sp) && owa_2013_sp == '1'))
{
path = hotfix_append_path(path:owa_2013_path, value:'WordConversionService\\bin\\Converter');
if (hotfix_check_fversion(file:'sword.dll', version:'15.0.5275.1000', min_version:'15.0.0.0', path:path, kb:'4484518', product:'Office Web Apps 2013') == HCF_OLDER)
vuln = TRUE;
}
####################################################################
# Office Online Server
####################################################################
if (oos_path && (!isnull(oos_sp) && oos_sp == '0'))
{
path = hotfix_append_path(path:oos_path, value:'WordConversionService\\bin\\Converter');
if (hotfix_check_fversion(file:'sword.dll', version:'16.0.10365.20000', min_version:'16.0.0.0', path:path, kb:'4484503', product:'Office Online Server') == HCF_OLDER)
vuln = TRUE;
}
if (vuln)
{
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');
}
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
91.0%