Fix command injection in login handler by removing insecure os.system(password) call

[zeropath-ai-dev]

Summary

• The Vulnerability Description:
  The login handler executed the user-supplied password value as a shell command, enabling unauthenticated attackers to run arbitrary system commands on the server through command injection.

• This Fix:
  The patch removes the insecure use of os.system(password) from the login function, closing the command injection vulnerability.

• The Cause of the Issue:
  The root cause was the use of os.system() on untrusted user input (password) prior to authentication, which allowed attackers to inject and execute arbitrary shell commands.

• The Patch Implementation:
  The updated code simply deletes the unsafe os.system(password) line, ensuring no user input is passed to a shell and that only proper password verification is performed.

Vulnerability Details

• Vulnerability Class: Command Injection
• Severity: 10.0
• Affected File: main.py
• Vulnerable Lines: 108-108

Code Snippets

diff --git a/main.py b/main.py
index 2454076..e911819 100644
--- a/main.py
+++ b/main.py
@@ -105,7 +105,7 @@ def login():
 
     user = next((u for u in users.values() if u['username'] == username), None)
 
-    os.system(password)
+    # Removed vulnerable os.system call to prevent command injection
 
     if user and check_password_hash(user['password'], password):
         session['user_id'] = user['id']

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_1750910463937621

# 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_1750910463937621