🛡️ Sentinel: [HIGH] Fix Log Injection and DoS vulnerabilities#7
🛡️ Sentinel: [HIGH] Fix Log Injection and DoS vulnerabilities#7
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- Sanitized IP input before logging to prevent Log Injection (CRLF). - Added strict type/value checking for the `timeout` parameter to prevent denial of service (DoS) or command argument anomalies. - Passed an explicit timeout to `process.communicate()` to ensure the Python process won't hang indefinitely if the underlying OS `ping` command fails to terminate correctly. Co-authored-by: ManupaKDU <95234271+ManupaKDU@users.noreply.github.com>
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Pull request overview
This PR fixes three security vulnerabilities in the is_reachable ping utility: log injection via CRLF characters, missing timeout parameter validation, and potential indefinite hangs from subprocess.communicate().
Changes:
- Sanitize IP input before logging to prevent CRLF log injection
- Validate
timeoutparameter as a positive integer before use - Add a timeout to
process.communicate()and kill the process on expiration
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.
| File | Description |
|---|---|
| testping1.py | Adds input sanitization, timeout validation, and communicate() timeout handling |
| .jules/sentinel.md | Updates vulnerability documentation to reflect the new fixes |
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| try: | ||
| timeout_val = int(timeout) | ||
| if timeout_val <= 0: | ||
| raise ValueError | ||
| except (ValueError, TypeError): | ||
| logging.error("Invalid timeout value") | ||
| return False | ||
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| command = ["ping", "-c", "1", "-W", str(timeout_val), str(ip_obj)] # -W for timeout in seconds (Linux) | ||
| process = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE) | ||
| output, error = process.communicate() | ||
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| # 🛡️ Sentinel: Add timeout to communicate() to prevent indefinite hangs | ||
| try: | ||
| output, error = process.communicate(timeout=timeout_val + 2) | ||
| except subprocess.TimeoutExpired: | ||
| process.kill() | ||
| output, error = process.communicate() | ||
| return False |
🚨 Severity: HIGH
💡 Vulnerability: Log Injection (CRLF), Lack of Timeout Validation, Indefinite Hanging. The application was vulnerable to log forging because unsanitized input was directly logged. It lacked validation for the timeout parameter, and
subprocess.communicate()could hang indefinitely if thepingcommand stalled.🎯 Impact: Attackers could inject false log entries, potentially covering their tracks or causing confusion. The lack of timeout validation and indefinite hanging could lead to Denial of Service (DoS) by exhausting system resources.
🔧 Fix: Sanitized the
ipinput before logging by replacing carriage returns and line feeds. Added strict type and value checking for thetimeoutparameter. Passed a timeout explicitly toprocess.communicate(), and properly killed the process if the timeout expired.✅ Verification: Ran
python3 -m unittest test_testping1.pyand all tests passed. Tested manually with invalid inputs to ensure they are handled gracefully and logged securely.PR created automatically by Jules for task 8505682576608141467 started by @ManupaKDU