What is Logic/Time Bomb (CWE-511)?

TL;DR: Logic/Time Bomb (CWE-511) disrupts software operations when certain conditions are met, leading to significant security risks. Ensure code integrity and review for suspicious patterns.

What is Logic/Time Bomb?

Logic/Time Bomb (CWE-511) is a type of vulnerability where code embedded within the product disrupts its normal operation when certain conditions are met, such as after a specific date or upon reaching a logical condition. As defined by the MITRE Corporation under CWE-511.

Quick Summary

Logic/Time Bomb vulnerabilities can cause significant damage to software operations and data integrity if triggered. They often remain hidden until a predetermined time or condition is reached. Jump to: Overview · How It Works · Business Impact · Attack Scenario · Detection · Fixes

Jump to: Quick Summary · Logic/Time Bomb Overview · How Logic/Time Bomb Works · Business Impact of Logic/Time Bomb · Logic/Time Bomb Attack Scenario · How to Detect Logic/Time Bomb · How to Fix Logic/Time Bomb · Framework-Specific Fixes for Logic/Time Bomb · How to Ask AI to Check Your Code for Logic/Time Bomb · Logic/Time Bomb Best Practices Checklist · Logic/Time Bomb FAQ · Vulnerabilities Related to Logic/Time Bomb · References · Scan Your Own Site

Logic/Time Bomb Overview

What

Logic/Time Bomb vulnerabilities are embedded within software code and disrupt normal operations based on specific conditions.

Why it matters

These vulnerabilities can cause severe data corruption, unauthorized access, and system downtime if the malicious logic is triggered.

Where it occurs

This vulnerability commonly appears in software development lifecycle stages where developers may intentionally or unintentionally embed harmful logic into applications.

Who is affected

Developers and organizations that deploy software with embedded malicious code are at risk of experiencing disruptions when conditions trigger these bombs.

Who is NOT affected

Organizations with strict code review processes and automated detection tools for suspicious patterns are less likely to be impacted.

How Logic/Time Bomb Works

Root Cause

The root cause lies in the intentional or unintentional embedding of harmful logic within software that disrupts normal operations when certain conditions are met.

Attack Flow

1. The attacker identifies embedded malicious code within the application.
2. Conditions for triggering the bomb (e.g., specific date, logical condition) are established during development.
3. When the specified time or condition is reached, the harmful logic executes and disrupts normal operations.
4. Data integrity is compromised, unauthorized access may occur, and system downtime ensues.

   Prerequisites to Exploit

   • The software must contain embedded malicious code designed to trigger under specific conditions.
   • Developers or attackers need to establish these conditions during development.

     Vulnerable Code

     ```python import datetime

def check_date(): if datetime.date.today() > datetime.date(2026, 1, 1): # Malicious logic here print(“Disrupting normal operations”)

This code checks the current date and executes harmful actions after January 1, 2026.
### Secure Code
```python
import datetime

def check_date():
    if datetime.date.today() > datetime.date(2026, 1, 1):
        raise Exception("Security breach detected")

This code raises an exception instead of executing harmful actions when the condition is met.

Business Impact of Logic/Time Bomb

Integrity

• Data integrity can be compromised when malicious logic alters or deletes critical data.
• Example: A bomb that triggers on a specific date may delete all user records in the database.

  Availability

• System downtime occurs when normal operations are disrupted by harmful actions.
• Example: An application crashes due to embedded code executing unauthorized commands.

  Financial, Compliance, Reputation

• Financial losses from system downtime and data breaches.
• Non-compliance with regulatory requirements for data integrity and security.
• Damage to reputation and customer trust if sensitive information is compromised.

Logic/Time Bomb Attack Scenario

1. The attacker identifies a specific date or logical condition within the application’s codebase that triggers harmful actions.
2. On the specified date, the embedded logic executes and disrupts normal operations.
3. Data integrity is compromised as critical data is altered or deleted by malicious commands.
4. Unauthorized access may occur if sensitive information is exposed due to disrupted security measures.
5. System downtime ensues as the application fails to operate normally.

How to Detect Logic/Time Bomb

Manual Testing

• Review code for suspicious patterns indicating embedded harmful logic.
• Check conditions that trigger disruptive actions, such as specific dates or logical triggers.
• Verify that no unauthorized commands are executed under specified conditions.

  Automated Scanners (SAST / DAST)

  Static analysis can detect suspicious patterns and conditional statements in the codebase. Dynamic testing is required to observe behavior when conditions are met.

  PenScan Detection

  PenScan’s scanner engines like ZAP, Nuclei, Wapiti, Nikto, SSLyze, Dalfox, and Nmap may identify potential logic/time bomb vulnerabilities during automated scans.

  False Positive Guidance

  A false positive occurs if the pattern looks risky but is actually safe due to context a scanner cannot determine.

How to Fix Logic/Time Bomb

• Always verify code integrity during installation.
• Implement strict access controls for modifying code or triggering conditions.
• Regularly review and update code to remove suspicious patterns.
• Use automated tools to detect potential triggers in the software.

Framework-Specific Fixes for Logic/Time Bomb

Python/Django

def check_date():
    if datetime.date.today() > datetime.date(2026, 1, 1):
        raise Exception("Security breach detected")

This code raises an exception instead of executing harmful actions when the condition is met.

How to Ask AI to Check Your Code for Logic/Time Bomb

Review the following Python code block for potential CWE-511 Logic/Time Bomb vulnerabilities and rewrite it using strict access controls: [paste code here]

Logic/Time Bomb Best Practices Checklist

✅ Verify code integrity during installation. ✅ Implement strict access controls for modifying code or triggering conditions. ✅ Regularly review and update code to remove suspicious patterns. ✅ Use automated tools to detect potential triggers in the software. ✅ Establish a secure development lifecycle to prevent embedding harmful logic.

Logic/Time Bomb FAQ

How does a logic/time bomb disrupt software operations?

A logic/time bomb disrupts software by executing malicious code when certain conditions are met, such as after a specific date or upon reaching a logical condition.

What is the root cause of a logic/time bomb vulnerability?

The root cause lies in embedded code designed to trigger destructive actions under specified conditions, often left intentionally by developers for various reasons including sabotage or revenge.

How can you detect a logic/time bomb in your software?

Detecting a logic/time bomb requires thorough code reviews and automated scanners that look for suspicious patterns like conditional statements tied to specific dates or logical triggers.

What are the common consequences of a logic/time bomb vulnerability?

A logic/time bomb can lead to data integrity issues, unauthorized access, and system downtime by disrupting normal operations when triggered.

How do you prevent a logic/time bomb from being deployed in software?

Prevent deployment by verifying code integrity during installation and ensuring thorough reviews for suspicious patterns or embedded malicious code.

What are the best practices to mitigate logic/time bomb vulnerabilities?

Regularly review and update code, implement strict access controls, and use automated tools to detect potential triggers in the software.

How can AI help identify logic/time bomb vulnerabilities in your codebase?

Use AI to analyze code for patterns indicative of logic/time bombs by reviewing conditional statements and date-based triggers that may indicate malicious intent.

Vulnerabilities Related to Logic/Time Bomb

| CWE | Name | Relationship | |—|—|—| | CWE-506 | Embedded Malicious Code (ChildOf) |

References

• MITRE
• NVD

Scan Your Own Site

Manual code review catches what you know to look for. An automated scan catches what you didn’t. Scan your own website using PenScan to find Logic/Time Bomb and other risks before an attacker does.