Code Smell 263 - Squatting
Maxi Contieri
Posted on August 13, 2024
Don't use guessable names in advance on mission-critical resources
TL;DR: Secure your cloud resources by avoiding predictable naming patterns.
Problems
Predictable names
Unauthorized access
Data exposure risks
Shadow resources
Account takeovers
Premature Optimization
Solutions
Use unique bucket names with dark keys
Verify ownership on creation
Secure resources fully
Have indirections obfuscating real names
Book names to prevent squatting
Randomize names
Context
Resource squatting happens when attackers anticipate the naming patterns of cloud resources, like S3 buckets.
The attacker creates them in regions where the user hasn't yet deployed resources.
User interaction with these attacker-owned resources can lead to severe security breaches like data exposure, unauthorized access, or account takeovers.
This vulnerability is critical in environments like AWS, where predictable naming conventions are often used.
Many systems avoid this indirection fearing the performance penalty which is a clear case of premature optimization.
Sample Code
Wrong
def create_bucket(account_id, region):
bucket_name = f"aws-glue-assets-{account_id}-{region}"
create_s3_bucket(bucket_name)
# This is deterministic and open
Right
import uuid
def create_bucket(account_id, region):
unique_id = uuid.uuid4().hex
# This number is not deterministic
# is a way to generate a random UUID (Universally Unique Identifier)
# in Python and then retrieve it as a hexadecimal string.
bucket_name = f"aws-glue-assets-{unique_id}-{account_id}-{region}"
create_s3_bucket(bucket_name)
verify_bucket_ownership(bucket_name, account_id)
Detection
[X] Automatic
A security audit can detect this smell by analyzing your resource names for predictability.
Look for patterns in names that an attacker can easily anticipate or guess.
Many automated tools and manual code reviews can help identify these risks.
Tags
- Security
Level
[X] Intermediate
AI Generation
AI generators may create this smell using standard templates with predictable naming patterns.
Always customize and review generated code for security.
AI Detection
AI can help detect this smell if configured with rules that identify predictable or insecure resource naming conventions.
This is a security risk that requires understanding of cloud infrastructure and potential attack vectors.
Conclusion
Avoiding predictable naming patterns is critical to securing your cloud resources.
Always use unique, obscure, hard-to-guess names, and also verify resource ownership to protect against squatting attacks.
Relations
More Info
Disclaimer
Code Smells are my opinion.
Credits
Photo by Felix Koutchinski on Unsplash
The only system which is truly secure is one which is switched off and unplugged, locked in a titanium lined safe, buried in a concrete bunker, and is surrounded by nerve gas and very highly paid armed guards. Even then, I wouldn't stake my life on it.
Gene Spafford
This article is part of the CodeSmell Series.
Posted on August 13, 2024
Join Our Newsletter. No Spam, Only the good stuff.
Sign up to receive the latest update from our blog.