Fix OS Command Injection in get_note by Removing os.system Call for URL Parameter 'tag'

[zeropath-ai-dev]

Summary

• The Vulnerability Description: The function get_note is vulnerable to OS command injection due to the use of os.system(tag) with the tag parameter sourced from a URL. This allows attackers to execute arbitrary commands on the server, potentially compromising its security and integrity.

• This Fix: The patch removes the dangerous call to os.system(tag), preventing the execution of untrusted input, thereby eliminating the OS command injection vulnerability.

• The Cause of the Issue: The vulnerability stems from directly passing a user-supplied value (tag) to os.system, which is capable of executing shell commands—this creates an opportunity for malicious users to perform unauthorized command execution.

• The Patch Implementation: The function has been refactored to remove the insecure os.system call, with the endpoint name and function being appropriately renamed to get_note_by_tag for clarity and to better reflect the intended use of the feature.

Vulnerability Details

• Vulnerability Class: Command Injection
• Severity: 10.0
• Affected File: main.py
• Vulnerable Lines: 97-103

Code Snippets

diff --git a/main.py b/main.py
index 11ebd2e..adabdf6 100644
--- a/main.py
+++ b/main.py
@@ -92,13 +92,11 @@ def get_note(note_id):
 
     return jsonify({"error": "Note not found"}), 404
 
-@app.route('/note_tag/<str:tag>', methods=['GET'])
-def get_note(note_id):
+@app.route('/note_tag/<string:tag>', methods=['GET'])
+def get_note_by_tag(tag):
     if 'user_id' not in session:
         return jsonify({"error": "Please log in"}), 401
 
-    os.system(tag)
-
     return jsonify({"error": "Note not found"}), 404
 
 @app.route('/login', methods=['POST'])

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_1736607274919572

# 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_1736607274919572