What is Use of Cache Containing Sensitive (CWE-524)?

TL;DR: Use of Cache Containing Sensitive Information (CWE-524) is a vulnerability where sensitive data is stored insecurely in cache, compromising confidentiality and integrity. Fix by encrypting or avoiding storage of sensitive information.

What is Use of Cache Containing Sensitive Information?

Use of Cache Containing Sensitive Information (CWE-524) is a type of vulnerability where sensitive information is stored in a cache that can be read by actors outside the intended control sphere. As defined by the MITRE Corporation under CWE-524, and classified by the OWASP Foundation under no specific category since it does not directly map to any A0X.

Quick Summary

Use of Cache Containing Sensitive Information is critical because it exposes sensitive data to potential theft or misuse, compromising system integrity. Jump to: Overview · How It Works · Business Impact · Attack Scenario · Detection · Fix

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

Use of Cache Containing Sensitive Information Overview

What: A cache containing sensitive information that can be accessed by unauthorized users. Why it matters: Exposes sensitive data to potential theft or misuse, compromising confidentiality and integrity. Where it occurs: Any backend language using caching mechanisms. Who is affected: Applications storing sensitive information in caches without proper protection. Who is NOT affected: Systems that do not cache sensitive information.

How Use of Cache Containing Sensitive Information Works

Root Cause

The root cause is the storage of sensitive data in a cache that can be accessed by unauthorized actors, leading to potential exposure and misuse of this data.

Attack Flow

1. An attacker gains access to the cache.
2. The attacker reads sensitive information from the cache.
3. The attacker uses or misuses the obtained sensitive data.

Prerequisites to Exploit

• Cache must contain sensitive data.
• Cache must be accessible by unauthorized users.

Vulnerable Code

cache = {}
cache['user_token'] = 'sensitive_user_token'

This code stores a user token in an unprotected cache, making it vulnerable to unauthorized access.

Secure Code

from cryptography.fernet import Fernet

key = Fernet.generate_key()
cipher_suite = Fernet(key)
encrypted_token = cipher_suite.encrypt(b'sensitive_user_token')
cache['user_token'] = encrypted_token

This code encrypts the user token before storing it in the cache, ensuring that even if accessed by unauthorized users, the data remains unreadable.

Business Impact of Use of Cache Containing Sensitive Information

Confidentiality

• Exposes sensitive information like tokens and keys to potential theft.
• Unauthorized access can lead to identity theft or financial fraud.

Business consequences:

• Financial losses due to fraudulent activities.
• Compliance penalties for data breaches.
• Reputational damage from loss of customer trust.

Use of Cache Containing Sensitive Information Attack Scenario

1. An attacker gains unauthorized access to the cache.
2. The attacker reads sensitive information like user tokens or API keys.
3. The attacker uses this information to gain unauthorized access to systems and services.
4. Financial transactions are made using stolen credentials, leading to financial loss.

How to Detect Use of Cache Containing Sensitive Information

Manual Testing

• Review cache configurations for any storage of sensitive data.
• Verify that encryption mechanisms are in place for sensitive data stored in caches.

Automated Scanners (SAST / DAST)

Static analysis can detect the presence of sensitive information in cache, while dynamic testing ensures actual runtime protection against unauthorized access.

PenScan Detection

PenScan’s scanners such as ZAP and Wapiti can identify vulnerabilities related to Use of Cache Containing Sensitive Information.

False Positive Guidance

A false positive occurs if a cache contains non-sensitive data or if encryption mechanisms are already in place, making the data unreadable without proper decryption keys.

How to Fix Use of Cache Containing Sensitive Information

• Protect information stored in cache.
• Do not store unnecessarily sensitive information in the cache.
• Consider using encryption in the cache.

Framework-Specific Fixes for Use of Cache Containing Sensitive Information

from cryptography.fernet import Fernet

key = Fernet.generate_key()
cipher_suite = Fernet(key)
encrypted_token = cipher_suite.encrypt(b'sensitive_user_token')
cache['user_token'] = encrypted_token

This Python example demonstrates encrypting sensitive data before storing it in the cache.

How to Ask AI to Check Your Code for Use of Cache Containing Sensitive Information

Review the following Python code block for potential CWE-524 Use of Cache Containing Sensitive Information vulnerabilities and rewrite it using encryption mechanisms: [paste code here]

Use of Cache Containing Sensitive Information Best Practices Checklist

✅ Protect information stored in cache. ✅ Do not store unnecessarily sensitive information in the cache. ✅ Consider using encryption for any data stored in the cache. ✅ Regularly audit caches to ensure no sensitive data is being stored.

Use of Cache Containing Sensitive Information FAQ

How does a cache containing sensitive information get exploited?

An attacker can access the cache and read sensitive data stored there if proper protections are not in place.

What is the primary cause of Use of Cache Containing Sensitive Information?

The main cause is storing sensitive information in a cache that can be accessed by unauthorized actors.

How does encryption help prevent this vulnerability?

Encrypting data stored in the cache ensures that even if an attacker gains access, they cannot read the sensitive information without decryption keys.

Can you provide real-world examples of Use of Cache Containing Sensitive Information?

Real-world examples include caching user session tokens or API keys in a shared memory space accessible by multiple applications.

How do I detect if my cache contains sensitive information?

Review your cache configuration and check for any storage of sensitive data like passwords, tokens, or personal identification numbers (PINs).

What are the best practices to prevent Use of Cache Containing Sensitive Information?

Ensure that sensitive information is not stored in caches and use encryption if caching must occur.

How can I fix a cache containing sensitive information once it’s identified?

Remove sensitive data from the cache or implement strong encryption mechanisms for any necessary cached data.

Vulnerabilities Related to Use of Cache Containing Sensitive Information

| CWE | Name | Relationship | |—|—|—| | CWE-668 | Exposure of Resource to Wrong Sphere | 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 Use of Cache Containing Sensitive Information and other risks before an attacker does.