KB5000856: Windows Server 2008 March 2021 Security Update - Nessus
Critical Plugin ID: 147217This page contains detailed information about the KB5000856: Windows Server 2008 March 2021 Security Update Nessus plugin including available exploits and PoCs found on GitHub, in Metasploit or Exploit-DB for verifying of this vulnerability.
Plugin Overview
ID: 147217
Name: KB5000856: Windows Server 2008 March 2021 Security Update
Filename: smb_nt_ms21_mar_5000844.nasl
Vulnerability Published: 2021-03-08
This Plugin Published: 2021-03-09
Last Modification Time: 2021-11-30
Plugin Version: 1.9
Plugin Type: local
Plugin Family: Windows : Microsoft Bulletins
Dependencies:
ms_bulletin_checks_possible.nasl, smb_check_rollup.nasl, smb_hotfixes.nasl
Required KB Items [?]: SMB/MS_Bulletin_Checks/Possible
Vulnerability Information
Severity: Critical
Vulnerability Published: 2021-03-08
Patch Published: 2021-03-08
CVE [?]: CVE-2021-1640, CVE-2021-24107, CVE-2021-26411, CVE-2021-26861, CVE-2021-26862, CVE-2021-26872, CVE-2021-26873, CVE-2021-26875, CVE-2021-26877, CVE-2021-26878, CVE-2021-26882, CVE-2021-26893, CVE-2021-26894, CVE-2021-26895, CVE-2021-26896, CVE-2021-26897, CVE-2021-26898, CVE-2021-26899, CVE-2021-26901, CVE-2021-27063, CVE-2021-27077
CPE [?]: cpe:/o:microsoft:windows
Exploited by Malware: True
Synopsis
The remote Windows host is affected by multiple vulnerabilities.
Description
The remote Windows host is missing security update 5000856 or cumulative update 5000844. It is, therefore, affected by multiple vulnerabilities :
- A remote code execution vulnerability. An attacker can exploit this to bypass authentication and execute unauthorized arbitrary commands. (CVE-2021-26861, CVE-2021-26877, CVE-2021-26893, CVE-2021-26894, CVE-2021-26895, CVE-2021-26897)
- An elevation of privilege vulnerability. An attacker can exploit this to gain elevated privileges. (CVE-2021-1640, CVE-2021-26862, CVE-2021-26872, CVE-2021-26873, CVE-2021-26875, CVE-2021-26878, CVE-2021-26882, CVE-2021-26898, CVE-2021-26899, CVE-2021-26901, CVE-2021-27077)
- An memory corruption vulnerability exists. An attacker can exploit this to corrupt the memory and cause unexpected behaviors within the system/application. (CVE-2021-26411)
- An information disclosure vulnerability. An attacker can exploit this to disclose potentially sensitive information. (CVE-2021-24107)
- A denial of service (DoS) vulnerability. An attacker can exploit this issue to cause the affected component to deny system or application services. (CVE-2021-26896, CVE-2021-27063)
Solution
Apply Security Only update KB5000856 or Cumulative Update KB5000844.
Public Exploits
Target Network Port(s): 139, 445
Target Asset(s): Host/patch_management_checks
Exploit Available: True (GitHub)
Exploit Ease: Exploits are available
Here's the list of publicly known exploits and PoCs for verifying the KB5000856: Windows Server 2008 March 2021 Security Update vulnerability:
- GitHub: https://github.com/CrackerCat/CVE-2021-26411
[CVE-2021-26411] - GitHub: https://github.com/EdgeSecurityTeam/Vulnerability
[CVE-2021-26411] - GitHub: https://github.com/KAB8345/CVE-2021-26411
[CVE-2021-26411] - GitHub: https://github.com/songjianyang/CVE-2021-26882
[CVE-2021-26882: PoC] - GitHub: https://github.com/api0cradle/CVE-2021-26882
[CVE-2021-26882: PoC]
Before running any exploit against any system, make sure you are authorized by the owner of the target system(s) to perform such activity. In any other case, this would be considered as an illegal activity.
WARNING: Beware of using unverified exploits from sources such as GitHub or Exploit-DB. These exploits and PoCs could contain malware. For more information, see how to use exploits safely.
Risk Information
CVSS Score Source [?]: CVE-2021-26861
CVSS V2 Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C/E:H/RL:OF/RC:C
CVSS Base Score: | 10.0 (High) |
Impact Subscore: | 10.0 |
Exploitability Subscore: | 10.0 |
CVSS Temporal Score: | 8.7 (High) |
CVSS Environmental Score: | NA (None) |
Modified Impact Subscore: | NA |
Overall CVSS Score: | 8.7 (High) |
CVSS Base Score: | 9.8 (Critical) |
Impact Subscore: | 5.9 |
Exploitability Subscore: | 3.9 |
CVSS Temporal Score: | 9.4 (Critical) |
CVSS Environmental Score: | NA (None) |
Modified Impact Subscore: | NA |
Overall CVSS Score: | 9.4 (Critical) |
STIG Risk Rating: High
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Plugin Source
This is the smb_nt_ms21_mar_5000844.nasl nessus plugin source code. This script is Copyright (C) 2021 and is owned by Tenable, Inc. or an Affiliate thereof.
#
# (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(147217);
script_version("1.9");
script_set_attribute(attribute:"plugin_modification_date", value:"2021/11/30");
script_cve_id(
"CVE-2021-1640",
"CVE-2021-24107",
"CVE-2021-26411",
"CVE-2021-26861",
"CVE-2021-26862",
"CVE-2021-26872",
"CVE-2021-26873",
"CVE-2021-26875",
"CVE-2021-26877",
"CVE-2021-26878",
"CVE-2021-26882",
"CVE-2021-26893",
"CVE-2021-26894",
"CVE-2021-26895",
"CVE-2021-26896",
"CVE-2021-26897",
"CVE-2021-26898",
"CVE-2021-26899",
"CVE-2021-26901",
"CVE-2021-27063",
"CVE-2021-27077"
);
script_xref(name:"MSKB", value:"5000844");
script_xref(name:"MSFT", value:"MS21-5000844");
script_xref(name:"MSKB", value:"5000856");
script_xref(name:"MSFT", value:"MS21-5000856");
script_xref(name:"IAVA", value:"2021-A-0130-S");
script_xref(name:"IAVA", value:"2021-A-0131");
script_xref(name:"IAVA", value:"2021-A-0134-S");
script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2021/11/17");
script_name(english:"KB5000856: Windows Server 2008 March 2021 Security Update");
script_set_attribute(attribute:"synopsis", value:
"The remote Windows host is affected by multiple vulnerabilities.");
script_set_attribute(attribute:"description", value:
"The remote Windows host is missing security update 5000856
or cumulative update 5000844. It is, therefore, affected by
multiple vulnerabilities :
- A remote code execution vulnerability. An attacker can
exploit this to bypass authentication and execute
unauthorized arbitrary commands. (CVE-2021-26861,
CVE-2021-26877, CVE-2021-26893, CVE-2021-26894,
CVE-2021-26895, CVE-2021-26897)
- An elevation of privilege vulnerability. An attacker can
exploit this to gain elevated privileges.
(CVE-2021-1640, CVE-2021-26862, CVE-2021-26872,
CVE-2021-26873, CVE-2021-26875, CVE-2021-26878,
CVE-2021-26882, CVE-2021-26898, CVE-2021-26899,
CVE-2021-26901, CVE-2021-27077)
- An memory corruption vulnerability exists. An attacker
can exploit this to corrupt the memory and cause
unexpected behaviors within the system/application.
(CVE-2021-26411)
- An information disclosure vulnerability. An attacker can
exploit this to disclose potentially sensitive
information. (CVE-2021-24107)
- A denial of service (DoS) vulnerability. An attacker can
exploit this issue to cause the affected component to
deny system or application services. (CVE-2021-26896,
CVE-2021-27063)");
# https://support.microsoft.com/en-us/topic/march-9-2021-kb5000844-monthly-rollup-d90d0eb1-6319-4a7e-97f6-68fbd306fd5a
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?177a5bc6");
# https://support.microsoft.com/en-us/topic/march-9-2021-kb5000856-security-only-update-7a0eb0b9-7f1c-44e5-ba3f-4f6e5e92b33e
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?22792d68");
script_set_attribute(attribute:"solution", value:
"Apply Security Only update KB5000856 or Cumulative Update KB5000844.");
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-2021-26861");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"exploited_by_malware", value:"true");
script_set_attribute(attribute:"vuln_publication_date", value:"2021/03/08");
script_set_attribute(attribute:"patch_publication_date", value:"2021/03/08");
script_set_attribute(attribute:"plugin_publication_date", value:"2021/03/09");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"cpe:/o:microsoft:windows");
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 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("smb_check_rollup.nasl", "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');
bulletin = 'MS21-03';
kbs = make_list(
'5000844',
'5000856'
);
if (get_kb_item('Host/patch_management_checks')) hotfix_check_3rd_party(bulletin:bulletin, kbs:kbs, severity:SECURITY_HOLE);
get_kb_item_or_exit('SMB/Registry/Enumerated');
get_kb_item_or_exit('SMB/WindowsVersion', exit_code:1);
if (hotfix_check_sp_range(vista:'2') <= 0) audit(AUDIT_OS_SP_NOT_VULN);
share = hotfix_get_systemdrive(as_share:TRUE, exit_on_fail:TRUE);
if (!is_accessible_share(share:share)) audit(AUDIT_SHARE_FAIL, share);
if (
smb_check_rollup(os:'6.0',
sp:2,
rollup_date:'03_2021',
bulletin:bulletin,
rollup_kb_list:[5000844, 5000856])
)
{
replace_kb_item(name:'SMB/Missing/'+bulletin, value:TRUE);
hotfix_security_hole();
hotfix_check_fversion_end();
exit(0);
}
else
{
hotfix_check_fversion_end();
audit(AUDIT_HOST_NOT, hotfix_get_audit_report());
}
The latest version of this script can be found in these locations depending on your platform:
- Linux / Unix:
/opt/nessus/lib/nessus/plugins/smb_nt_ms21_mar_5000844.nasl
- Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\smb_nt_ms21_mar_5000844.nasl
- Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/smb_nt_ms21_mar_5000844.nasl
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How to Run
Here is how to run the KB5000856: Windows Server 2008 March 2021 Security Update as a standalone plugin via the Nessus web user interface (https://localhost:8834/):
- Click to start a New Scan.
- Select Advanced Scan.
- Navigate to the Plugins tab.
- On the top right corner click to Disable All plugins.
- On the left side table select Windows : Microsoft Bulletins plugin family.
- On the right side table select KB5000856: Windows Server 2008 March 2021 Security Update plugin ID 147217.
- Specify the target on the Settings tab and click to Save the scan.
- Run the scan.
Here are a few examples of how to run the plugin in the command line. Note that the examples below demonstrate the usage on the Linux / Unix platform.
Basic usage:
/opt/nessus/bin/nasl smb_nt_ms21_mar_5000844.nasl -t <IP/HOST>
Run the plugin with audit trail message on the console:
/opt/nessus/bin/nasl -a smb_nt_ms21_mar_5000844.nasl -t <IP/HOST>
Run the plugin with trace script execution written to the console (useful for debugging):
/opt/nessus/bin/nasl -T - smb_nt_ms21_mar_5000844.nasl -t <IP/HOST>
Run the plugin with using a state file for the target and updating it (useful for running multiple plugins on the target):
/opt/nessus/bin/nasl -K /tmp/state smb_nt_ms21_mar_5000844.nasl -t <IP/HOST>
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References
MSKB | Microsoft Knowledge Base: MSFT | Microsoft Security Bulletin:
- MS21-5000844, MS21-5000856
- 2021-A-0130-S, 2021-A-0131, 2021-A-0134-S
- https://www.tenable.com/plugins/nessus/147217
- http://www.nessus.org/u?177a5bc6
- http://www.nessus.org/u?22792d68
- https://vulners.com/nessus/SMB_NT_MS21_MAR_5000844.NASL
- 147226 - KB5000802: Windows Security Update (March 2021)
- 147222 - KB5000803: Windows Security Update (March 2021)
- 147230 - KB5000807: Windows 10 March 2021 Security Update
- 147220 - KB5000808: Windows 10 Version 1909 March 2021 Security Update
- 147224 - KB5000809: Windows 10 Version 1803 March 2021 Security Update
- 147223 - KB5000822: Windows 10 Version 1809 and Windows Server 2019 March 2021 Security Update
- 147231 - KB5000851: Windows 7 and Windows Server 2008 R2 March 2021 Security Update
- 147221 - KB5000840: Windows Server 2012 March 2021 Security Update
- 147229 - KB5000853: Windows 8.1 and Windows Server 2012 R2 March 2021 Security Update
- 147228 - Security Updates for Internet Explorer (March 2021)
Version
This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file smb_nt_ms21_mar_5000844.nasl version 1.9. For more plugins, visit the Nessus Plugin Library.
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