6.5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:P/I:P/A:P
8.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.4 High
AI Score
Confidence
High
0.965 High
EPSS
Percentile
99.6%
The Microsoft Exchange Server installed on the remote host is missing security updates. It is, therefore, affected by multiple vulnerabilities:
A session spoofing vulnerability exists. An attacker can exploit this to perform actions with the privileges of another user. (CVE-2021-41349, CVE-2021-42305)
A remote code execution vulnerability. An attacker can exploit this to bypass authentication and execute unauthorized arbitrary commands. (CVE-2021-42321)
#%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(154999);
script_version("1.13");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/06/06");
script_cve_id("CVE-2021-41349", "CVE-2021-42305", "CVE-2021-42321");
script_xref(name:"IAVA", value:"2021-A-0543-S");
script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2021/12/01");
script_xref(name:"MSKB", value:"5007409");
script_xref(name:"MSFT", value:"MS21-5007409");
script_name(english:"Security Updates for Exchange (November 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 session spoofing vulnerability exists. An attacker can
exploit this to perform actions with the privileges of
another user. (CVE-2021-41349, CVE-2021-42305)
- A remote code execution vulnerability. An attacker can
exploit this to bypass authentication and execute
unauthorized arbitrary commands. (CVE-2021-42321)");
script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/en-us/help/5007409");
script_set_attribute(attribute:"solution", value:
"Microsoft has released KB5007409 to address this issue.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:P");
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:L/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-2021-42321");
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 Server ChainedSerializationBinder RCE');
script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");
script_set_attribute(attribute:"vuln_publication_date", value:"2021/11/09");
script_set_attribute(attribute:"patch_publication_date", value:"2021/11/09");
script_set_attribute(attribute:"plugin_publication_date", value:"2021/11/09");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:exchange_server:2016");
script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:exchange_server:2019");
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,
'min_version': '15.0.1497.0',
'fixed_version': '15.0.1497.26'
},
{
'product' : '2016',
'unsupported_cu' : 20,
'min_version': '15.1.2308.0',
'fixed_version': '15.1.2308.20'
},
{
'product': '2016',
'unsupported_cu': 20,
'min_version': '15.1.2375.0',
'fixed_version': '15.1.2375.17'
},
{
'product' : '2019',
'unsupported_cu' : 9,
'min_version': '15.2.922.0',
'fixed_version': '15.2.922.19'
},
{
'product' : '2019',
'unsupported' : 9,
'min_version': '15.2.986.0',
'fixed_version': '15.2.986.14'
}
];
vcf::microsoft::exchange::check_version_and_report(
app_info:app_info,
bulletin:'MS21-11',
constraints:constraints,
severity:SECURITY_WARNING
);
Vendor | Product | Version | CPE |
---|---|---|---|
microsoft | exchange_server | 2016 | cpe:/a:microsoft:exchange_server:2016 |
microsoft | exchange_server | 2019 | cpe:/a:microsoft:exchange_server:2019 |
6.5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:P/I:P/A:P
8.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.4 High
AI Score
Confidence
High
0.965 High
EPSS
Percentile
99.6%