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 Office 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-2020-1445)
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-2020-1446, CVE-2020-1447, CVE-2020-1448)
A spoofing vulnerability exists when an Office Web Apps server does not properly sanitize a specially crafted request. An authenticated attacker could exploit the vulnerability by sending a specially crafted request to an affected Office Web Apps server. The attacker who successfully exploited this vulnerability could then perform cross-site scripting attacks on affected systems and run script in the security context of the current user. For the vulnerability to be exploited, a user must click a specially crafted URL that takes the user to a targeted Office Web App site. (CVE-2020-1442)
An information disclosure vulnerability exists when Microsoft Office software reads out of bound memory due to an uninitialized variable, which could disclose the contents of memory. An attacker who successfully exploited the vulnerability could view out of bound memory. Exploitation of the vulnerability requires that a user open a specially crafted file with an affected version of Microsoft Office software. The security update addresses the vulnerability by properly initializing the affected variable. (CVE-2020-1342)
#
# (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(138469);
script_version("1.5");
script_set_attribute(attribute:"plugin_modification_date", value:"2020/08/14");
script_cve_id(
"CVE-2020-1342",
"CVE-2020-1442",
"CVE-2020-1445",
"CVE-2020-1446",
"CVE-2020-1447",
"CVE-2020-1448"
);
script_xref(name:"MSKB", value:"4484357");
script_xref(name:"MSKB", value:"4484381");
script_xref(name:"MSKB", value:"4484451");
script_xref(name:"MSFT", value:"MS20-4484357");
script_xref(name:"MSFT", value:"MS20-4484381");
script_xref(name:"MSFT", value:"MS20-4484451");
script_xref(name:"IAVA", value:"2020-A-0307-S");
script_name(english:"Security Updates for Microsoft Office Web Apps (July 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 Office 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-2020-1445)
- 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-2020-1446,
CVE-2020-1447, CVE-2020-1448)
- A spoofing vulnerability exists when an Office Web Apps
server does not properly sanitize a specially crafted
request. An authenticated attacker could exploit the
vulnerability by sending a specially crafted request to
an affected Office Web Apps server. The attacker who
successfully exploited this vulnerability could then
perform cross-site scripting attacks on affected systems
and run script in the security context of the current
user. For the vulnerability to be exploited, a user must
click a specially crafted URL that takes the user to a
targeted Office Web App site. (CVE-2020-1442)
- An information disclosure vulnerability exists when
Microsoft Office software reads out of bound memory due
to an uninitialized variable, which could disclose the
contents of memory. An attacker who successfully
exploited the vulnerability could view out of bound
memory. Exploitation of the vulnerability requires that
a user open a specially crafted file with an affected
version of Microsoft Office software. The security
update addresses the vulnerability by properly
initializing the affected variable. (CVE-2020-1342)");
# https://support.microsoft.com/en-us/help/4484357/security-update-for-office-web-apps-server-2013-july-14-2020
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?1ce2dd72");
# https://support.microsoft.com/en-us/help/4484381/security-update-for-sharepoint-2010-office-web-apps-july-14-2020
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?42ba0628");
# https://support.microsoft.com/en-us/help/4484451/security-update-for-office-online-server-july-14-2020
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?cce850ff");
script_set_attribute(attribute:"solution", value:
"Microsoft has released the following security updates to address this issue:
-KB4484357
-KB4484381
-KB4484451");
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:N/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-2020-1448");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"vuln_publication_date", value:"2020/07/14");
script_set_attribute(attribute:"patch_publication_date", value:"2020/07/14");
script_set_attribute(attribute:"plugin_publication_date", value:"2020/07/14");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:office_web_apps");
script_set_attribute(attribute:"stig_severity", value:"II");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Windows : Microsoft Bulletins");
script_copyright(english:"This script is Copyright (C) 2020 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 = 'MS20-07';
kbs = make_list(
'4484357',
'4484381',
'4484451'
);
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:'msoserver.dll', version:'14.0.7252.5000', min_version:'14.0.0.0', path:path, kb:'4484381', 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:'15.0.5259.1000', min_version:'15.0.0.0', path:path, kb:'4484357', 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:'16.0.10362.20000', min_version:'16.0.0.0', path:path, kb:'4484451', 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');
}
Vendor | Product | Version |
---|---|---|
microsoft | office_web_apps |
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-1342
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-1442
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-1445
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-1446
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-1447
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-1448
www.nessus.org/u?1ce2dd72
www.nessus.org/u?42ba0628
www.nessus.org/u?cce850ff