AI Security Analysis: blog-eletrix-fr

ai/security_report_2026-03-11_blog-eletrix-fr.md

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+====
+
+Auto Security Analysis of blog-eletrix-fr at 2026-03-11
+CRITICAL - Stored Cross-Site Scripting (XSS)
+The application allows users to create blog posts where the content is rendered in the `post.html` template using the `|safe` filter. Additionally, the `markdown2.markdown()` function is used without sanitizing the input. This allows an attacker to inject and execute arbitrary JavaScript code in the browser of any user who views the post.
+
+PoC
+```python
+import urllib.request
+import urllib.parse
+import http.cookiejar
+
+def test_xss():
+    cj = http.cookiejar.CookieJar()
+    opener = urllib.request.build_opener(urllib.request.HTTPCookieProcessor(cj))
+
+    # Login (requires admin credentials)
+    login_data = urllib.parse.urlencode({'username': 'admin', 'password': 'admin'}).encode('utf-8')
+    opener.open('http://localhost:5000/login', login_data)
+
+    # Create Post with XSS payload
+    xss_payload = '<script>alert("XSS")</script>'
+    post_data = urllib.parse.urlencode({
+        'title': 'XSS Test',
+        'author': 'attacker',
+        'tags': 'test',
+        'content': f'This is a test post with XSS: {xss_payload}'
+    }).encode('utf-8')
+
+    opener.open('http://localhost:5000/create_post', post_data)
+
+    # Verify XSS in rendered post
+    response = opener.open('http://localhost:5000/post/XSS_Test')
+    content = response.read().decode('utf-8')
+    if xss_payload in content:
+        print("XSS Vulnerability Confirmed!")
+
+if __name__ == "__main__":
+    test_xss()
+```
+
+Fix
+Remove the `|safe` filter from `html/post.html` or use a library like `bleach` to sanitize the HTML output after it has been rendered from Markdown.
+
+```python
+import bleach
+html_content = bleach.clean(markdown2.markdown(post_file.content))
+```
+
+====
+
+MEDIUM - Missing CSRF Protection
+The application lacks Cross-Site Request Forgery (CSRF) protection on critical routes such as `/login`, `/create_post`, and `/upload`. An attacker could trick an authenticated administrator into performing actions without their knowledge, such as creating a malicious blog post or uploading unauthorized files.
+
+PoC
+```python
+# A simple HTML form hosted on an attacker's site could trigger this
+# <form action="http://localhost:5000/create_post" method="POST">
+#   <input type="hidden" name="title" value="CSRF_Post">
+#   <input type="hidden" name="author" value="attacker">
+#   <input type="hidden" name="tags" value="csrf">
+#   <input type="hidden" name="content" value="Created via CSRF">
+#   <input type="submit" value="Click me">
+# </form>
+```
+
+Fix
+Implement CSRF protection using an extension like `Flask-WTF`. This will ensure that state-changing requests originate from the application's own forms.
+
+```python
+from flask_wtf.csrf import CSRFProtect
+csrf = CSRFProtect(app)
+```
+
+====
+
+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. If the application is not behind a Cloudflare proxy that sanitizes this header, an attacker can spoof their IP address by providing a custom `CF-Real-IP` header in their request.
+
+PoC
+```python
+import urllib.request
+
+def test_ip_spoof():
+    req = urllib.request.Request('http://localhost:5000/')
+    req.add_header('CF-Real-IP', '1.2.3.4')
+    urllib.request.urlopen(req)
+    print("Sent request with spoofed IP: 1.2.3.4")
+
+if __name__ == "__main__":
+    test_ip_spoof()
+```
+
+Fix
+Only trust the `CF-Real-IP` header if the request is known to come from a trusted Cloudflare IP range. Otherwise, rely on `request.remote_addr`.
+
+```python
+# app.py
+@app.context_processor
+def inject_variables():
+    # Only trust header from trusted proxies
+    # For simplicity, default to remote_addr if not configured
+    return dict(
+        user_ip=request.remote_addr
+    )
+```
+
+====
+
+Summary:
+- CRITICAL: Stored Cross-Site Scripting (XSS)
+- MEDIUM: Missing CSRF Protection
+- LOW: IP Spoofing via CF-Real-IP Header