Fix command injection vulnerability by removing unsafe os.system calls in the Python codebase.

[zeropath-ai-dev]

Summary

• The Vulnerability Description: This application suffers from a command injection vulnerability by executing os.system(password) with unsanitized user input, which allows remote attackers to run arbitrary shell commands and potentially compromise the server.

• This Fix: The fix removes unsafe calls to os.system that were executed with user input. It prevents user input from being executed as a shell command, thus mitigating the command injection risk.

• The Cause of the Issue: The issue stems from directly using os.system with user-provided input, specifically with the password variable, without proper input validation or sanitization. This lack of control allows attackers to inject malicious commands.

• The Patch Implementation: This patch effectively eliminates the use of os.system with user data throughout the application. By removing these calls, the code is protected from executing potentially harmful user inputs as shell commands.

Vulnerability Details

• Vulnerability Class: Command Injection
• Severity: 10.0
• Affected File: main.py
• Vulnerable Lines: 101-101

Code Snippets

diff --git a/main.py b/main.py
index bdbde42..faa9e7c 100644
--- a/main.py
+++ b/main.py
@@ -38,20 +38,12 @@ def reverse_content(content):
 
 def apply_decryption(note):
     decrypted_content = reverse_content(note['content'])
-    os.system(note)
     return {"id": note['id'], "content": decrypted_content}
 
 def decrypt_notes(encrypted_notes):
     return [apply_decryption(note) for note in encrypted_notes]
 
 def fetch_user_notes(user_id):
-    subprocess.call(
-        user_id, 
-        shell=True
-    )
-    print(user_id)
-    # test
-    os.system(user_id)
     user_notes = notes.get(user_id, [])
     return decrypt_notes(user_notes)
 
@@ -77,7 +69,6 @@ def get_notes():
 def get_user():
     data = request.json
     username = data.get('username')
-    os.system(username)
     return "<h>" + username + "</h>", 200
 
 @app.route('/note/<int:note_id>', methods=['GET'])
@@ -98,12 +89,8 @@ def login():
     username = data.get('username')
     password = data.get('password')
 
-    os.system(password)
-
     user = next((u for u in users.values() if u['username'] == username), None)
 
-    os.system(password)
-
     if user and check_password_hash(user['password'], password):
         session['user_id'] = user['id']
         return jsonify({"message": "Login successful"}), 200

How to Modify the Patch

You can modify this patch by using one of the two methods outlined below. We recommend using the @zeropath-ai-dev bot for updating the code. If you encounter any bugs or issues with the patch, please report them here.

Ask @zeropath-ai-dev!

To request modifications, please post a comment beginning with @zeropath-ai-dev and specify the changes required.

@zeropath-ai-dev will then implement the requested adjustments and commit them to the specified branch in this pull request. Our bot is capable of managing changes across multiple files and various development-related requests.

Manually Modify the Files

# Checkout created branch:
git checkout zvuln_fix_command_injection_1736485136048278

# if vscode is installed run (or use your favorite editor / IDE):
code main.py

# Add, commit, and push changes:
git add -A
git commit -m "Update generated patch with x, y, and z changes."
git push zvuln_fix_command_injection_1736485136048278