The Microsoft Exchange Server installed on the remote host is missing security updates. It is, therefore, affected by multiple vulnerabilities:
A remote code execution vulnerability. An attacker could exploit this to execute unauthorized arbitrary code. (CVE-2021-28483, CVE-2021-28482, CVE-2021-28481, CVE-2021-28480, CVE-2021-34473)
An elevation of privilege vulnerability. An attacker can exploit this to gain elevated privileges. (CVE-2021-34523)
An information disclosure vulnerability. An attacker can exploit this to disclose potentially sensitive information. (CVE-2021-33766)
#%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(148476);
script_version("1.15");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/01/04");
script_cve_id(
"CVE-2021-28480",
"CVE-2021-28481",
"CVE-2021-28482",
"CVE-2021-28483",
"CVE-2021-33766",
"CVE-2021-34473",
"CVE-2021-34523"
);
script_xref(name:"MSKB", value:"5001779");
script_xref(name:"MSFT", value:"MS21-5001779");
script_xref(name:"IAVA", value:"2021-A-0160-S");
script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2021/11/17");
script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2022/02/01");
script_xref(name:"CEA-ID", value:"CEA-2021-0040");
script_xref(name:"CEA-ID", value:"CEA-2021-0022");
script_xref(name:"CEA-ID", value:"CEA-2021-0021");
script_name(english:"Security Updates for Microsoft Exchange Server (April 2021)");
script_set_attribute(attribute:"synopsis", value:
"The Microsoft Exchange Server installed on the remote host is affected by
multiple vulnerabilities.");
script_set_attribute(attribute:"description", value:
"The Microsoft Exchange Server installed on the remote host
is missing security updates. It is, therefore, affected by
multiple vulnerabilities:
- A remote code execution vulnerability. An attacker could exploit this to
execute unauthorized arbitrary code. (CVE-2021-28483, CVE-2021-28482,
CVE-2021-28481, CVE-2021-28480, CVE-2021-34473)
- An elevation of privilege vulnerability. An attacker can exploit this to
gain elevated privileges. (CVE-2021-34523)
- An information disclosure vulnerability. An attacker can exploit this to
disclose potentially sensitive information. (CVE-2021-33766)");
# https://support.microsoft.com/en-us/topic/description-of-the-security-update-for-microsoft-exchange-server-2019-2016-and-2013-april-13-2021-kb5001779-8e08f3b3-fc7b-466c-bbb7-5d5aa16ef064
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?3bdeeea7");
# https://msrc-blog.microsoft.com/2021/04/13/april-2021-update-tuesday-packages-now-available/
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b66291c9");
script_set_attribute(attribute:"solution", value:
"Microsoft has released the following security updates to address this issue:
-KB5001779");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/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:L/PR:N/UI:N/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-2021-34473");
script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2021-28481");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"exploit_framework_core", value:"true");
script_set_attribute(attribute:"exploited_by_malware", value:"true");
script_set_attribute(attribute:"metasploit_name", value:'Microsoft Exchange ProxyShell RCE');
script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");
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:exchange_server");
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("ms_bulletin_checks_possible.nasl", "microsoft_exchange_installed.nbin");
script_require_keys("SMB/MS_Bulletin_Checks/Possible");
script_require_ports(139, 445, "Host/patch_management_checks");
exit(0);
}
include('vcf_extras_microsoft.inc');
var app_info = vcf::microsoft::exchange::get_app_info();
var constraints =
[
{
'product' : '2013',
'unsupported_cu' : 22,
'cu' : 23,
'min_version': '15.00.1497.0',
'fixed_version': '15.00.1497.18',
'kb': '5001779'
},
{
'product' : '2016',
'unsupported_cu' : 18,
'cu' : 20,
'min_version': '15.01.2176.0',
'fixed_version': '15.01.2176.14',
'kb': '5001779'
},
{
'product': '2016',
'unsupported_cu': 18,
'cu' : 20,
'min_version': '15.01.2242.0',
'fixed_version': '15.01.2242.10',
'kb': '5001779'
},
{
'product' : '2019',
'unsupported_cu' : 7,
'cu' : 8,
'min_version': '15.02.792.0',
'fixed_version': '15.02.792.15',
'kb': '5001779'
},
{
'product' : '2019',
'unsupported_cu' : 7,
'cu' : 9,
'min_version': '15.02.858.0',
'fixed_version': '15.02.858.12',
'kb': '5001779'
}
];
vcf::microsoft::exchange::check_version_and_report
(
app_info:app_info,
bulletin:'MS21-05',
constraints:constraints,
severity:SECURITY_HOLE
);
Vendor | Product | Version |
---|---|---|
microsoft | exchange_server |
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-28480
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-28481
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-28482
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-28483
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-33766
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-34473
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-34523
www.nessus.org/u?3bdeeea7
www.nessus.org/u?b66291c9